467 lines
11 KiB
Go
467 lines
11 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 TestC(t *testing.T) {
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type args struct {
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radius float64
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center pixel.Vec
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}
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tests := []struct {
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name string
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args args
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want pixel.Circle
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}{
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{
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name: "C(): positive radius",
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args: args{radius: 10, center: pixel.ZV},
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want: pixel.Circle{Radius: 10, Center: pixel.ZV},
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},
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{
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name: "C(): zero radius",
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args: args{radius: 0, center: pixel.ZV},
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want: pixel.Circle{Radius: 0, Center: pixel.ZV},
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},
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{
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name: "C(): negative radius",
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args: args{radius: -5, center: pixel.ZV},
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want: pixel.Circle{Radius: -5, Center: 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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if got := pixel.C(tt.args.center, tt.args.radius); !reflect.DeepEqual(got, tt.want) {
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t.Errorf("C() = %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 TestCircle_String(t *testing.T) {
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type fields struct {
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radius float64
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center 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 string
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}{
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{
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name: "Circle.String(): positive radius",
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fields: fields{radius: 10, center: pixel.ZV},
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want: "Circle(Vec(0, 0), 10.00)",
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},
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{
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name: "Circle.String(): zero radius",
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fields: fields{radius: 0, center: pixel.ZV},
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want: "Circle(Vec(0, 0), 0.00)",
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},
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{
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name: "Circle.String(): negative radius",
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fields: fields{radius: -5, center: pixel.ZV},
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want: "Circle(Vec(0, 0), -5.00)",
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},
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{
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name: "Circle.String(): irrational radius",
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fields: fields{radius: math.Pi, center: pixel.ZV},
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want: "Circle(Vec(0, 0), 3.14)",
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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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c := pixel.C(tt.fields.center, tt.fields.radius)
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if got := c.String(); got != tt.want {
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t.Errorf("Circle.String() = %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 TestCircle_Norm(t *testing.T) {
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type fields struct {
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radius float64
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center 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.Circle
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}{
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{
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name: "Circle.Norm(): positive radius",
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fields: fields{radius: 10, center: pixel.ZV},
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want: pixel.C(pixel.ZV, 10),
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},
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{
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name: "Circle.Norm(): zero radius",
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fields: fields{radius: 0, center: pixel.ZV},
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want: pixel.C(pixel.ZV, 0),
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},
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{
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name: "Circle.Norm(): negative radius",
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fields: fields{radius: -5, center: pixel.ZV},
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want: pixel.C(pixel.ZV, 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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c := pixel.C(tt.fields.center, tt.fields.radius)
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if got := c.Norm(); !reflect.DeepEqual(got, tt.want) {
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t.Errorf("Circle.Norm() = %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 TestCircle_Area(t *testing.T) {
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type fields struct {
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radius float64
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center 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: "Circle.Area(): positive radius",
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fields: fields{radius: 10, center: pixel.ZV},
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want: 100 * math.Pi,
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},
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{
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name: "Circle.Area(): zero radius",
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fields: fields{radius: 0, center: pixel.ZV},
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want: 0,
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},
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{
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name: "Circle.Area(): negative radius",
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fields: fields{radius: -5, center: pixel.ZV},
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want: 25 * math.Pi,
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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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c := pixel.C(tt.fields.center, tt.fields.radius)
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if got := c.Area(); got != tt.want {
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t.Errorf("Circle.Area() = %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 TestCircle_Moved(t *testing.T) {
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type fields struct {
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radius float64
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center pixel.Vec
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}
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type args struct {
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delta 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.Circle
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}{
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{
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name: "Circle.Moved(): positive movement",
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fields: fields{radius: 10, center: pixel.ZV},
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args: args{delta: pixel.V(10, 20)},
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want: pixel.C(pixel.V(10, 20), 10),
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},
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{
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name: "Circle.Moved(): zero movement",
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fields: fields{radius: 10, center: pixel.ZV},
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args: args{delta: pixel.ZV},
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want: pixel.C(pixel.V(0, 0), 10),
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},
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{
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name: "Circle.Moved(): negative movement",
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fields: fields{radius: 10, center: pixel.ZV},
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args: args{delta: pixel.V(-5, -10)},
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want: pixel.C(pixel.V(-5, -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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c := pixel.C(tt.fields.center, tt.fields.radius)
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if got := c.Moved(tt.args.delta); !reflect.DeepEqual(got, tt.want) {
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t.Errorf("Circle.Moved() = %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 TestCircle_Resized(t *testing.T) {
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type fields struct {
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radius float64
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center pixel.Vec
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}
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type args struct {
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radiusDelta float64
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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.Circle
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}{
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{
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name: "Circle.Resized(): positive delta",
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fields: fields{radius: 10, center: pixel.ZV},
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args: args{radiusDelta: 5},
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want: pixel.C(pixel.V(0, 0), 15),
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},
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{
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name: "Circle.Resized(): zero delta",
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fields: fields{radius: 10, center: pixel.ZV},
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args: args{radiusDelta: 0},
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want: pixel.C(pixel.V(0, 0), 10),
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},
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{
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name: "Circle.Resized(): negative delta",
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fields: fields{radius: 10, center: pixel.ZV},
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args: args{radiusDelta: -5},
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want: pixel.C(pixel.V(0, 0), 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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c := pixel.C(tt.fields.center, tt.fields.radius)
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if got := c.Resized(tt.args.radiusDelta); !reflect.DeepEqual(got, tt.want) {
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t.Errorf("Circle.Resized() = %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 TestCircle_Contains(t *testing.T) {
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type fields struct {
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radius float64
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center pixel.Vec
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}
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type args struct {
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u 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: "Circle.Contains(): point on cicles' center",
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fields: fields{radius: 10, center: pixel.ZV},
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args: args{u: pixel.ZV},
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want: true,
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},
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{
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name: "Circle.Contains(): point offcenter",
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fields: fields{radius: 10, center: pixel.V(5, 0)},
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args: args{u: pixel.ZV},
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want: true,
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},
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{
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name: "Circle.Contains(): point on circumference",
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fields: fields{radius: 10, center: pixel.V(10, 0)},
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args: args{u: pixel.ZV},
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want: true,
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},
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{
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name: "Circle.Contains(): point outside circle",
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fields: fields{radius: 10, center: pixel.V(15, 0)},
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args: args{u: pixel.ZV},
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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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c := pixel.C(tt.fields.center, tt.fields.radius)
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if got := c.Contains(tt.args.u); got != tt.want {
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t.Errorf("Circle.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 TestCircle_Union(t *testing.T) {
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type fields struct {
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radius float64
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center pixel.Vec
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}
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type args struct {
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d 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.Circle
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}{
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{
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name: "Circle.Union(): overlapping circles",
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fields: fields{radius: 5, center: pixel.ZV},
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args: args{d: pixel.C(pixel.ZV, 5)},
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want: pixel.C(pixel.ZV, 5),
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},
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{
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name: "Circle.Union(): separate circles",
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fields: fields{radius: 1, center: pixel.ZV},
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args: args{d: pixel.C(pixel.V(0, 2), 1)},
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want: pixel.C(pixel.V(0, 1), 2),
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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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c := pixel.C(tt.fields.center, tt.fields.radius)
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if got := c.Union(tt.args.d); !reflect.DeepEqual(got, tt.want) {
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t.Errorf("Circle.Union() = %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 TestCircle_Intersect(t *testing.T) {
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type fields struct {
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radius float64
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center pixel.Vec
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}
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type args struct {
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d 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.Circle
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}{
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{
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name: "Circle.Intersect(): intersecting circles",
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fields: fields{radius: 1, center: pixel.ZV},
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args: args{d: pixel.C(pixel.V(1, 0), 1)},
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want: pixel.C(pixel.V(0.5, 0), 1),
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},
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{
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name: "Circle.Intersect(): non-intersecting circles",
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fields: fields{radius: 1, center: pixel.ZV},
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args: args{d: pixel.C(pixel.V(3, 3), 1)},
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want: pixel.C(pixel.V(1.5, 1.5), 0),
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},
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{
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name: "Circle.Intersect(): first circle encompassing second",
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fields: fields{radius: 10, center: pixel.ZV},
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args: args{d: pixel.C(pixel.V(3, 3), 1)},
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want: pixel.C(pixel.ZV, 10),
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},
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{
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name: "Circle.Intersect(): second circle encompassing first",
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fields: fields{radius: 1, center: pixel.V(-1, -4)},
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args: args{d: pixel.C(pixel.ZV, 10)},
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want: pixel.C(pixel.ZV, 10),
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},
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{
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name: "Circle.Intersect(): matching circles",
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fields: fields{radius: 1, center: pixel.ZV},
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args: args{d: pixel.C(pixel.ZV, 1)},
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want: pixel.C(pixel.ZV, 1),
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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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c := pixel.C(
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tt.fields.center,
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tt.fields.radius,
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)
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if got := c.Intersect(tt.args.d); !reflect.DeepEqual(got, tt.want) {
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t.Errorf("Circle.Intersect() = %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 TestCircle_IntersectPoints(t *testing.T) {
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type fields struct {
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Center pixel.Vec
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Radius float64
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}
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type args struct {
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l 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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}{
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{
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name: "Line intersects circle at two points",
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fields: fields{Center: pixel.V(2, 2), Radius: 1},
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args: args{pixel.L(pixel.V(0, 0), pixel.V(10, 10))},
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want: []pixel.Vec{pixel.V(1.292, 1.292), pixel.V(2.707, 2.707)},
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},
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{
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name: "Line intersects circle at one point",
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fields: fields{Center: pixel.V(-0.5, -0.5), Radius: 1},
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args: args{pixel.L(pixel.V(0, 0), pixel.V(10, 10))},
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want: []pixel.Vec{pixel.V(0.207, 0.207)},
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},
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{
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name: "Line endpoint is circle center",
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fields: fields{Center: pixel.V(0, 0), Radius: 1},
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args: args{pixel.L(pixel.V(0, 0), pixel.V(10, 10))},
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want: []pixel.Vec{pixel.V(0.707, 0.707)},
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},
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{
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name: "Both line endpoints within circle",
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fields: fields{Center: pixel.V(0, 0), Radius: 1},
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args: args{pixel.L(pixel.V(0.2, 0.2), pixel.V(0.5, 0.5))},
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want: []pixel.Vec{},
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},
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{
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name: "Line does not intersect circle",
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fields: fields{Center: pixel.V(10, 0), Radius: 1},
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args: args{pixel.L(pixel.V(0, 0), pixel.V(10, 10))},
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want: []pixel.Vec{},
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},
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{
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name: "Horizontal line intersects circle at two points",
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fields: fields{Center: pixel.V(5, 5), Radius: 1},
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args: args{pixel.L(pixel.V(0, 5), pixel.V(10, 5))},
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want: []pixel.Vec{pixel.V(4, 5), pixel.V(6, 5)},
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},
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{
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name: "Vertical line intersects circle at two points",
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fields: fields{Center: pixel.V(5, 5), Radius: 1},
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args: args{pixel.L(pixel.V(5, 0), pixel.V(5, 10))},
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want: []pixel.Vec{pixel.V(5, 4), pixel.V(5, 6)},
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},
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{
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name: "Left and down line intersects circle at two points",
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fields: fields{Center: pixel.V(5, 5), Radius: 1},
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args: args{pixel.L(pixel.V(10, 10), pixel.V(0, 0))},
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want: []pixel.Vec{pixel.V(5.707, 5.707), pixel.V(4.292, 4.292)},
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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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c := pixel.Circle{
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Center: tt.fields.Center,
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Radius: tt.fields.Radius,
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}
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got := c.IntersectionPoints(tt.args.l)
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for i, v := range got {
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if !closeEnough(v.X, tt.want[i].X, 2) || !closeEnough(v.Y, tt.want[i].Y, 2) {
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t.Errorf("Circle.IntersectPoints() = %v, want %v", v, tt.want[i])
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}
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}
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})
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}
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}
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