700 lines
16 KiB
Go
700 lines
16 KiB
Go
package pixel_test
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import (
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"math"
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"reflect"
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"testing"
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"github.com/faiface/pixel"
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)
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func TestLine_Bounds(t *testing.T) {
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type fields struct {
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A pixel.Vec
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B pixel.Vec
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}
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tests := []struct {
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name string
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fields fields
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want pixel.Rect
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}{
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{
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name: "Positive slope",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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want: pixel.R(0, 0, 10, 10),
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},
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{
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name: "Negative slope",
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fields: fields{A: pixel.V(10, 10), B: pixel.V(0, 0)},
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want: pixel.R(0, 0, 10, 10),
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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l := pixel.Line{
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A: tt.fields.A,
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B: tt.fields.B,
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}
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if got := l.Bounds(); !reflect.DeepEqual(got, tt.want) {
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t.Errorf("Line.Bounds() = %v, want %v", got, tt.want)
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}
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})
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}
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}
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func TestLine_Center(t *testing.T) {
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type fields struct {
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A pixel.Vec
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B pixel.Vec
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}
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tests := []struct {
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name string
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fields fields
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want pixel.Vec
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}{
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{
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name: "Positive slope",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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want: pixel.V(5, 5),
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},
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{
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name: "Negative slope",
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fields: fields{A: pixel.V(10, 10), B: pixel.V(0, 0)},
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want: pixel.V(5, 5),
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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l := pixel.Line{
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A: tt.fields.A,
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B: tt.fields.B,
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}
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if got := l.Center(); !reflect.DeepEqual(got, tt.want) {
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t.Errorf("Line.Center() = %v, want %v", got, tt.want)
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}
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})
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}
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}
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func TestLine_Closest(t *testing.T) {
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type fields struct {
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A pixel.Vec
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B pixel.Vec
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}
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type args struct {
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v pixel.Vec
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}
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tests := []struct {
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name string
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fields fields
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args args
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want pixel.Vec
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}{
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{
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name: "Point on line",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{v: pixel.V(5, 5)},
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want: pixel.V(5, 5),
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},
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{
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name: "Point on next to line",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{v: pixel.V(0, 10)},
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want: pixel.V(5, 5),
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},
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{
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name: "Point on next to vertical line",
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fields: fields{A: pixel.V(5, 0), B: pixel.V(5, 10)},
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args: args{v: pixel.V(6, 5)},
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want: pixel.V(5, 5),
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},
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{
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name: "Point on next to horizontal line",
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fields: fields{A: pixel.V(0, 5), B: pixel.V(10, 5)},
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args: args{v: pixel.V(5, 6)},
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want: pixel.V(5, 5),
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},
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{
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name: "Point far from line",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{v: pixel.V(80, -70)},
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want: pixel.V(5, 5),
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},
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{
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name: "Point on inline with line",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{v: pixel.V(20, 20)},
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want: pixel.V(10, 10),
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},
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{
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name: "Vertical line",
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fields: fields{A: pixel.V(0, -10), B: pixel.V(0, 10)},
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args: args{v: pixel.V(-1, 0)},
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want: pixel.V(0, 0),
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},
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{
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name: "Horizontal line",
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fields: fields{A: pixel.V(-10, 0), B: pixel.V(10, 0)},
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args: args{v: pixel.V(0, -1)},
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want: pixel.V(0, 0),
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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l := pixel.Line{
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A: tt.fields.A,
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B: tt.fields.B,
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}
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if got := l.Closest(tt.args.v); !reflect.DeepEqual(got, tt.want) {
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t.Errorf("Line.Closest() = %v, want %v", got, tt.want)
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}
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})
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}
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}
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func TestLine_Contains(t *testing.T) {
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type fields struct {
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A pixel.Vec
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B pixel.Vec
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}
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type args struct {
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v pixel.Vec
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}
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tests := []struct {
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name string
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fields fields
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args args
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want bool
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}{
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{
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name: "Point on line",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{v: pixel.V(5, 5)},
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want: true,
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},
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{
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name: "Point on negative sloped line",
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fields: fields{A: pixel.V(0, 10), B: pixel.V(10, 0)},
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args: args{v: pixel.V(5, 5)},
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want: true,
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},
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{
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name: "Point not on line",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{v: pixel.V(0, 10)},
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want: false,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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l := pixel.Line{
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A: tt.fields.A,
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B: tt.fields.B,
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}
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if got := l.Contains(tt.args.v); got != tt.want {
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t.Errorf("Line.Contains() = %v, want %v", got, tt.want)
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}
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})
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}
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}
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func TestLine_Formula(t *testing.T) {
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type fields struct {
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A pixel.Vec
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B pixel.Vec
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}
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tests := []struct {
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name string
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fields fields
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wantM float64
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wantB float64
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}{
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{
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name: "Getting formula - 45 degs",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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wantM: 1,
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wantB: 0,
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},
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{
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name: "Getting formula - 90 degs",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(0, 10)},
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wantM: math.Inf(1),
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wantB: math.NaN(),
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},
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{
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name: "Getting formula - 0 degs",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 0)},
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wantM: 0,
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wantB: 0,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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l := pixel.Line{
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A: tt.fields.A,
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B: tt.fields.B,
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}
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gotM, gotB := l.Formula()
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if gotM != tt.wantM {
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t.Errorf("Line.Formula() gotM = %v, want %v", gotM, tt.wantM)
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}
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if gotB != tt.wantB {
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if math.IsNaN(tt.wantB) && !math.IsNaN(gotB) {
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t.Errorf("Line.Formula() gotB = %v, want %v", gotB, tt.wantB)
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}
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}
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})
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}
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}
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func TestLine_Intersect(t *testing.T) {
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type fields struct {
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A pixel.Vec
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B pixel.Vec
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}
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type args struct {
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k pixel.Line
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}
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tests := []struct {
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name string
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fields fields
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args args
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want pixel.Vec
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want1 bool
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}{
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{
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name: "Lines intersect",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{k: pixel.L(pixel.V(0, 10), pixel.V(10, 0))},
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want: pixel.V(5, 5),
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want1: true,
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},
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{
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name: "Lines intersect 2",
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fields: fields{A: pixel.V(5, 1), B: pixel.V(1, 1)},
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args: args{k: pixel.L(pixel.V(2, 0), pixel.V(2, 3))},
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want: pixel.V(2, 1),
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want1: true,
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},
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{
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name: "Line intersect with vertical",
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fields: fields{A: pixel.V(5, 0), B: pixel.V(5, 10)},
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args: args{k: pixel.L(pixel.V(0, 0), pixel.V(10, 10))},
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want: pixel.V(5, 5),
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want1: true,
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},
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{
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name: "Line intersect with horizontal",
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fields: fields{A: pixel.V(0, 5), B: pixel.V(10, 5)},
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args: args{k: pixel.L(pixel.V(0, 0), pixel.V(10, 10))},
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want: pixel.V(5, 5),
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want1: true,
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},
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{
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name: "Lines don't intersect",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{k: pixel.L(pixel.V(0, 10), pixel.V(1, 20))},
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want: pixel.ZV,
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want1: false,
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},
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{
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name: "Lines don't intersect 2",
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fields: fields{A: pixel.V(1, 1), B: pixel.V(1, 5)},
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args: args{k: pixel.L(pixel.V(-5, 0), pixel.V(-2, 2))},
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want: pixel.ZV,
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want1: false,
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},
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{
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name: "Lines don't intersect 3",
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fields: fields{A: pixel.V(2, 0), B: pixel.V(2, 3)},
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args: args{k: pixel.L(pixel.V(1, 5), pixel.V(5, 5))},
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want: pixel.ZV,
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want1: false,
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},
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{
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name: "Lines parallel",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{k: pixel.L(pixel.V(0, 1), pixel.V(10, 11))},
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want: pixel.ZV,
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want1: false,
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}, {
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name: "Lines intersect",
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fields: fields{A: pixel.V(600, 600), B: pixel.V(925, 150)},
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args: args{k: pixel.L(pixel.V(740, 255), pixel.V(925, 255))},
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want: pixel.V(849.1666666666666, 255),
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want1: true,
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},
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{
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name: "Lines intersect",
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fields: fields{A: pixel.V(600, 600), B: pixel.V(925, 150)},
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args: args{k: pixel.L(pixel.V(740, 255), pixel.V(925, 255.0001))},
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want: pixel.V(849.1666240490657, 255.000059008986),
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want1: true,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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l := pixel.Line{
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A: tt.fields.A,
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B: tt.fields.B,
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}
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got, got1 := l.Intersect(tt.args.k)
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if !reflect.DeepEqual(got, tt.want) {
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t.Errorf("Line.Intersect() got = %v, want %v", got, tt.want)
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}
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if got1 != tt.want1 {
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t.Errorf("Line.Intersect() got1 = %v, want %v", got1, tt.want1)
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}
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})
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}
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}
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func TestLine_IntersectCircle(t *testing.T) {
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type fields struct {
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A pixel.Vec
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B pixel.Vec
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}
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type args struct {
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c pixel.Circle
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}
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tests := []struct {
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name string
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fields fields
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args args
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want pixel.Vec
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}{
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{
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name: "Cirle intersects",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{c: pixel.C(pixel.V(6, 4), 2)},
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want: pixel.V(0.5857864376269049, -0.5857864376269049),
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},
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{
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name: "Cirle doesn't intersects",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{c: pixel.C(pixel.V(0, 5), 1)},
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want: pixel.ZV,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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l := pixel.Line{
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A: tt.fields.A,
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B: tt.fields.B,
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}
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if got := l.IntersectCircle(tt.args.c); !reflect.DeepEqual(got, tt.want) {
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t.Errorf("Line.IntersectCircle() = %v, want %v", got, tt.want)
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}
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})
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}
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}
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func TestLine_IntersectRect(t *testing.T) {
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type fields struct {
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A pixel.Vec
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B pixel.Vec
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}
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type args struct {
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r pixel.Rect
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}
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tests := []struct {
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name string
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fields fields
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args args
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want pixel.Vec
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}{
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{
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name: "Line through rect vertically",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(0, 10)},
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args: args{r: pixel.R(-1, 1, 5, 5)},
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want: pixel.V(-1, 0),
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},
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{
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name: "Line through rect horizontally",
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fields: fields{A: pixel.V(0, 1), B: pixel.V(10, 1)},
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args: args{r: pixel.R(1, 0, 5, 5)},
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want: pixel.V(0, -1),
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},
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{
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name: "Line through rect diagonally bottom and left edges",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{r: pixel.R(0, 2, 3, 3)},
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want: pixel.V(-1, 1),
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},
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{
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name: "Line through rect diagonally top and right edges",
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fields: fields{A: pixel.V(10, 0), B: pixel.V(0, 10)},
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args: args{r: pixel.R(5, 0, 8, 3)},
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want: pixel.V(-2.5, -2.5),
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},
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{
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name: "Line with not rect intersect",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
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args: args{r: pixel.R(20, 20, 21, 21)},
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want: pixel.ZV,
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},
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{
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name: "Line intersects at 0,0",
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fields: fields{A: pixel.V(0, -10), B: pixel.V(0, 10)},
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args: args{r: pixel.R(-1, 0, 2, 2)},
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want: pixel.V(-1, 0),
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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l := pixel.Line{
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A: tt.fields.A,
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B: tt.fields.B,
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}
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if got := l.IntersectRect(tt.args.r); !reflect.DeepEqual(got, tt.want) {
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t.Errorf("Line.IntersectRect() = %v, want %v", got, tt.want)
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}
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})
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}
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}
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func TestLine_Len(t *testing.T) {
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type fields struct {
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A pixel.Vec
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B pixel.Vec
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}
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tests := []struct {
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name string
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fields fields
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want float64
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}{
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{
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name: "End right-up of start",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(3, 4)},
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want: 5,
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},
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{
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name: "End left-up of start",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(-3, 4)},
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want: 5,
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},
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{
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name: "End right-down of start",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(3, -4)},
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want: 5,
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},
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{
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name: "End left-down of start",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(-3, -4)},
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want: 5,
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},
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{
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name: "End same as start",
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fields: fields{A: pixel.V(0, 0), B: pixel.V(0, 0)},
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want: 0,
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},
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}
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for _, tt := range tests {
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t.Run(tt.name, func(t *testing.T) {
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l := pixel.Line{
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A: tt.fields.A,
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B: tt.fields.B,
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}
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if got := l.Len(); got != tt.want {
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t.Errorf("Line.Len() = %v, want %v", got, tt.want)
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}
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})
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}
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}
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func TestLine_Rotated(t *testing.T) {
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// round returns the nearest integer, rounding ties away from zero.
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// This is required because `math.Round` wasn't introduced until Go1.10
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round := func(x float64) float64 {
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t := math.Trunc(x)
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if math.Abs(x-t) >= 0.5 {
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return t + math.Copysign(1, x)
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}
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return t
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}
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type fields struct {
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A pixel.Vec
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B pixel.Vec
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}
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type args struct {
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around pixel.Vec
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angle float64
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}
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tests := []struct {
|
|
name string
|
|
fields fields
|
|
args args
|
|
want pixel.Line
|
|
}{
|
|
{
|
|
name: "Rotating around line center",
|
|
fields: fields{A: pixel.V(1, 1), B: pixel.V(3, 3)},
|
|
args: args{around: pixel.V(2, 2), angle: math.Pi},
|
|
want: pixel.L(pixel.V(3, 3), pixel.V(1, 1)),
|
|
},
|
|
{
|
|
name: "Rotating around x-y origin",
|
|
fields: fields{A: pixel.V(1, 1), B: pixel.V(3, 3)},
|
|
args: args{around: pixel.V(0, 0), angle: math.Pi},
|
|
want: pixel.L(pixel.V(-1, -1), pixel.V(-3, -3)),
|
|
},
|
|
{
|
|
name: "Rotating around line end",
|
|
fields: fields{A: pixel.V(1, 1), B: pixel.V(3, 3)},
|
|
args: args{around: pixel.V(1, 1), angle: math.Pi},
|
|
want: pixel.L(pixel.V(1, 1), pixel.V(-1, -1)),
|
|
},
|
|
}
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
l := pixel.Line{
|
|
A: tt.fields.A,
|
|
B: tt.fields.B,
|
|
}
|
|
// Have to round the results, due to floating-point in accuracies. Results are correct to approximately
|
|
// 10 decimal places.
|
|
got := l.Rotated(tt.args.around, tt.args.angle)
|
|
if round(got.A.X) != tt.want.A.X ||
|
|
round(got.B.X) != tt.want.B.X ||
|
|
round(got.A.Y) != tt.want.A.Y ||
|
|
round(got.B.Y) != tt.want.B.Y {
|
|
t.Errorf("Line.Rotated() = %v, want %v", got, tt.want)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestLine_Scaled(t *testing.T) {
|
|
type fields struct {
|
|
A pixel.Vec
|
|
B pixel.Vec
|
|
}
|
|
type args struct {
|
|
scale float64
|
|
}
|
|
tests := []struct {
|
|
name string
|
|
fields fields
|
|
args args
|
|
want pixel.Line
|
|
}{
|
|
{
|
|
name: "Scaling by 1",
|
|
fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
|
|
args: args{scale: 1},
|
|
want: pixel.L(pixel.V(0, 0), pixel.V(10, 10)),
|
|
},
|
|
{
|
|
name: "Scaling by >1",
|
|
fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
|
|
args: args{scale: 2},
|
|
want: pixel.L(pixel.V(-5, -5), pixel.V(15, 15)),
|
|
},
|
|
{
|
|
name: "Scaling by <1",
|
|
fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
|
|
args: args{scale: 0.5},
|
|
want: pixel.L(pixel.V(2.5, 2.5), pixel.V(7.5, 7.5)),
|
|
},
|
|
{
|
|
name: "Scaling by -1",
|
|
fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
|
|
args: args{scale: -1},
|
|
want: pixel.L(pixel.V(10, 10), pixel.V(0, 0)),
|
|
},
|
|
}
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
l := pixel.Line{
|
|
A: tt.fields.A,
|
|
B: tt.fields.B,
|
|
}
|
|
if got := l.Scaled(tt.args.scale); !reflect.DeepEqual(got, tt.want) {
|
|
t.Errorf("Line.Scaled() = %v, want %v", got, tt.want)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestLine_ScaledXY(t *testing.T) {
|
|
type fields struct {
|
|
A pixel.Vec
|
|
B pixel.Vec
|
|
}
|
|
type args struct {
|
|
around pixel.Vec
|
|
scale float64
|
|
}
|
|
tests := []struct {
|
|
name string
|
|
fields fields
|
|
args args
|
|
want pixel.Line
|
|
}{
|
|
{
|
|
name: "Scaling by 1 around origin",
|
|
fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
|
|
args: args{around: pixel.ZV, scale: 1},
|
|
want: pixel.L(pixel.V(0, 0), pixel.V(10, 10)),
|
|
},
|
|
{
|
|
name: "Scaling by >1 around origin",
|
|
fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
|
|
args: args{around: pixel.ZV, scale: 2},
|
|
want: pixel.L(pixel.V(0, 0), pixel.V(20, 20)),
|
|
},
|
|
{
|
|
name: "Scaling by <1 around origin",
|
|
fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
|
|
args: args{around: pixel.ZV, scale: 0.5},
|
|
want: pixel.L(pixel.V(0, 0), pixel.V(5, 5)),
|
|
},
|
|
{
|
|
name: "Scaling by -1 around origin",
|
|
fields: fields{A: pixel.V(0, 0), B: pixel.V(10, 10)},
|
|
args: args{around: pixel.ZV, scale: -1},
|
|
want: pixel.L(pixel.V(0, 0), pixel.V(-10, -10)),
|
|
},
|
|
}
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
l := pixel.Line{
|
|
A: tt.fields.A,
|
|
B: tt.fields.B,
|
|
}
|
|
if got := l.ScaledXY(tt.args.around, tt.args.scale); !reflect.DeepEqual(got, tt.want) {
|
|
t.Errorf("Line.ScaledXY() = %v, want %v", got, tt.want)
|
|
}
|
|
})
|
|
}
|
|
}
|
|
|
|
func TestLine_String(t *testing.T) {
|
|
type fields struct {
|
|
A pixel.Vec
|
|
B pixel.Vec
|
|
}
|
|
tests := []struct {
|
|
name string
|
|
fields fields
|
|
want string
|
|
}{
|
|
{
|
|
name: "Getting string",
|
|
fields: fields{A: pixel.V(0, 0), B: pixel.V(1, 1)},
|
|
want: "Line(Vec(0, 0), Vec(1, 1))",
|
|
},
|
|
}
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
l := pixel.Line{
|
|
A: tt.fields.A,
|
|
B: tt.fields.B,
|
|
}
|
|
if got := l.String(); got != tt.want {
|
|
t.Errorf("Line.String() = %v, want %v", got, tt.want)
|
|
}
|
|
})
|
|
}
|
|
}
|