package pixel_test
import (
"fmt"
"reflect"
"testing"
"github.com/faiface/pixel"
)
func TestRect_Resize(t *testing.T) {
type rectTestTransform struct {
name string
f func(pixel.Rect) pixel.Rect
}
// rectangles
squareAroundOrigin := pixel.R(-10, -10, 10, 10)
squareAround2020 := pixel.R(10, 10, 30, 30)
rectangleAroundOrigin := pixel.R(-20, -10, 20, 10)
rectangleAround2020 := pixel.R(0, 10, 40, 30)
// resize transformations
resizeByHalfAroundCenter := rectTestTransform{"by half around center", func(rect pixel.Rect) pixel.Rect {
return rect.Resized(rect.Center(), rect.Size().Scaled(0.5))
}}
resizeByHalfAroundMin := rectTestTransform{"by half around Min", func(rect pixel.Rect) pixel.Rect {
return rect.Resized(rect.Min, rect.Size().Scaled(0.5))
}}
resizeByHalfAroundMax := rectTestTransform{"by half around Max", func(rect pixel.Rect) pixel.Rect {
return rect.Resized(rect.Max, rect.Size().Scaled(0.5))
}}
resizeByHalfAroundMiddleOfLeftSide := rectTestTransform{"by half around middle of left side", func(rect pixel.Rect) pixel.Rect {
return rect.Resized(pixel.V(rect.Min.X, rect.Center().Y), rect.Size().Scaled(0.5))
}}
resizeByHalfAroundOrigin := rectTestTransform{"by half around the origin", func(rect pixel.Rect) pixel.Rect {
return rect.Resized(pixel.ZV, rect.Size().Scaled(0.5))
}}
testCases := []struct {
input pixel.Rect
transform rectTestTransform
answer pixel.Rect
}{
{squareAroundOrigin, resizeByHalfAroundCenter, pixel.R(-5, -5, 5, 5)},
{squareAround2020, resizeByHalfAroundCenter, pixel.R(15, 15, 25, 25)},
{rectangleAroundOrigin, resizeByHalfAroundCenter, pixel.R(-10, -5, 10, 5)},
{rectangleAround2020, resizeByHalfAroundCenter, pixel.R(10, 15, 30, 25)},
{squareAroundOrigin, resizeByHalfAroundMin, pixel.R(-10, -10, 0, 0)},
{squareAround2020, resizeByHalfAroundMin, pixel.R(10, 10, 20, 20)},
{rectangleAroundOrigin, resizeByHalfAroundMin, pixel.R(-20, -10, 0, 0)},
{rectangleAround2020, resizeByHalfAroundMin, pixel.R(0, 10, 20, 20)},
{squareAroundOrigin, resizeByHalfAroundMax, pixel.R(0, 0, 10, 10)},
{squareAround2020, resizeByHalfAroundMax, pixel.R(20, 20, 30, 30)},
{rectangleAroundOrigin, resizeByHalfAroundMax, pixel.R(0, 0, 20, 10)},
{rectangleAround2020, resizeByHalfAroundMax, pixel.R(20, 20, 40, 30)},
{squareAroundOrigin, resizeByHalfAroundMiddleOfLeftSide, pixel.R(-10, -5, 0, 5)},
{squareAround2020, resizeByHalfAroundMiddleOfLeftSide, pixel.R(10, 15, 20, 25)},
{rectangleAroundOrigin, resizeByHalfAroundMiddleOfLeftSide, pixel.R(-20, -5, 0, 5)},
{rectangleAround2020, resizeByHalfAroundMiddleOfLeftSide, pixel.R(0, 15, 20, 25)},
{squareAroundOrigin, resizeByHalfAroundOrigin, pixel.R(-5, -5, 5, 5)},
{squareAround2020, resizeByHalfAroundOrigin, pixel.R(5, 5, 15, 15)},
{rectangleAroundOrigin, resizeByHalfAroundOrigin, pixel.R(-10, -5, 10, 5)},
{rectangleAround2020, resizeByHalfAroundOrigin, pixel.R(0, 5, 20, 15)},
}
for _, testCase := range testCases {
t.Run(fmt.Sprintf("Resize %v %s", testCase.input, testCase.transform.name), func(t *testing.T) {
testResult := testCase.transform.f(testCase.input)
if testResult != testCase.answer {
t.Errorf("Got: %v, wanted: %v\n", testResult, testCase.answer)
}
})
}
}
func TestRect_Edges(t *testing.T) {
type fields struct {
Min pixel.Vec
Max pixel.Vec
}
tests := []struct {
name string
fields fields
want [4]pixel.Line
}{
{
name: "Get edges",
fields: fields{Min: pixel.V(0, 0), Max: pixel.V(10, 10)},
want: [4]pixel.Line{
pixel.L(pixel.V(0, 0), pixel.V(0, 10)),
pixel.L(pixel.V(0, 10), pixel.V(10, 10)),
pixel.L(pixel.V(10, 10), pixel.V(10, 0)),
pixel.L(pixel.V(10, 0), pixel.V(0, 0)),
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
r := pixel.Rect{
Min: tt.fields.Min,
Max: tt.fields.Max,
}
if got := r.Edges(); !reflect.DeepEqual(got, tt.want) {
t.Errorf("Rect.Edges() = %v, want %v", got, tt.want)
}
})
}
}
func TestRect_Vertices(t *testing.T) {
type fields struct {
Min pixel.Vec
Max pixel.Vec
}
tests := []struct {
name string
fields fields
want [4]pixel.Vec
}{
{
name: "Get corners",
fields: fields{Min: pixel.V(0, 0), Max: pixel.V(10, 10)},
want: [4]pixel.Vec{
pixel.V(0, 0),
pixel.V(0, 10),
pixel.V(10, 10),
pixel.V(10, 0),
},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
r := pixel.Rect{
Min: tt.fields.Min,
Max: tt.fields.Max,
}
if got := r.Vertices(); !reflect.DeepEqual(got, tt.want) {
t.Errorf("Rect.Vertices() = %v, want %v", got, tt.want)
}
})
}
}
func TestRect_IntersectCircle(t *testing.T) {
type fields struct {
Min pixel.Vec
Max pixel.Vec
}
type args struct {
c pixel.Circle
}
tests := []struct {
name string
fields fields
args args
want pixel.Vec
}{
{
name: "Rect.IntersectCircle(): no overlap",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(50, 50), 1)},
want: pixel.ZV,
},
{
name: "Rect.IntersectCircle(): circle contains rect",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(5, 5), 10)},
want: pixel.V(-15, 0),
},
{
name: "Rect.IntersectCircle(): rect contains circle",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(5, 5), 1)},
want: pixel.V(-6, 0),
},
{
name: "Rect.IntersectCircle(): circle overlaps bottom-left corner",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(-0.5, -0.5), 1)},
want: pixel.V(-0.2, -0.2),
},
{
name: "Rect.IntersectCircle(): circle overlaps top-left corner",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(-0.5, 10.5), 1)},
want: pixel.V(-0.2, 0.2),
},
{
name: "Rect.IntersectCircle(): circle overlaps bottom-right corner",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(10.5, -0.5), 1)},
want: pixel.V(0.2, -0.2),
},
{
name: "Rect.IntersectCircle(): circle overlaps top-right corner",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(10.5, 10.5), 1)},
want: pixel.V(0.2, 0.2),
},
{
name: "Rect.IntersectCircle(): circle overlaps two corners",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(0, 5), 6)},
want: pixel.V(6, 0),
},
{
name: "Rect.IntersectCircle(): circle overlaps left edge",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(0, 5), 1)},
want: pixel.V(1, 0),
},
{
name: "Rect.IntersectCircle(): circle overlaps bottom edge",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(5, 0), 1)},
want: pixel.V(0, 1),
},
{
name: "Rect.IntersectCircle(): circle overlaps right edge",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(10, 5), 1)},
want: pixel.V(-1, 0),
},
{
name: "Rect.IntersectCircle(): circle overlaps top edge",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(5, 10), 1)},
want: pixel.V(0, -1),
},
{
name: "Rect.IntersectCircle(): edge is tangent of left side",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(-1, 5), 1)},
want: pixel.ZV,
},
{
name: "Rect.IntersectCircle(): edge is tangent of top side",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(5, -1), 1)},
want: pixel.ZV,
},
{
name: "Rect.IntersectCircle(): circle above rectangle",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(5, 12), 1)},
want: pixel.ZV,
},
{
name: "Rect.IntersectCircle(): circle below rectangle",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(5, -2), 1)},
want: pixel.ZV,
},
{
name: "Rect.IntersectCircle(): circle left of rectangle",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(-1, 5), 1)},
want: pixel.ZV,
},
{
name: "Rect.IntersectCircle(): circle right of rectangle",
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
args: args{c: pixel.C(pixel.V(11, 5), 1)},
want: pixel.ZV,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
r := pixel.Rect{
Min: tt.fields.Min,
Max: tt.fields.Max,
}
got := r.IntersectCircle(tt.args.c)
if !closeEnough(got.X, tt.want.X, 2) || !closeEnough(got.Y, tt.want.Y, 2) {
t.Errorf("Rect.IntersectCircle() = %v, want %v", got, tt.want)
}
})
}
}
func TestRect_IntersectionPoints(t *testing.T) {
type fields struct {
Min pixel.Vec
Max pixel.Vec
}
type args struct {
l pixel.Line
}
tests := []struct {
name string
fields fields
args args
want []pixel.Vec
}{
{
name: "No intersection points",
fields: fields{Min: pixel.V(1, 1), Max: pixel.V(5, 5)},
args: args{l: pixel.L(pixel.V(-5, 0), pixel.V(-2, 2))},
want: []pixel.Vec{},
},
{
name: "One intersection point",
fields: fields{Min: pixel.V(1, 1), Max: pixel.V(5, 5)},
args: args{l: pixel.L(pixel.V(2, 0), pixel.V(2, 3))},
want: []pixel.Vec{pixel.V(2, 1)},
},
{
name: "Two intersection points",
fields: fields{Min: pixel.V(1, 1), Max: pixel.V(5, 5)},
args: args{l: pixel.L(pixel.V(0, 2), pixel.V(6, 2))},
want: []pixel.Vec{pixel.V(1, 2), pixel.V(5, 2)},
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
r := pixel.Rect{
Min: tt.fields.Min,
Max: tt.fields.Max,
}
if got := r.IntersectionPoints(tt.args.l); !reflect.DeepEqual(got, tt.want) {
t.Errorf("Rect.IntersectPoints() = %v, want %v", got, tt.want)
}
})
}
}
var rectIntTests = []struct {
name string
r1, r2 pixel.Rect
want pixel.Rect
intersect bool
}{
{
name: "Nothing touching",
r1: pixel.R(0, 0, 10, 10),
r2: pixel.R(21, 21, 40, 40),
want: pixel.ZR,
},
{
name: "Edge touching",
r1: pixel.R(0, 0, 10, 10),
r2: pixel.R(10, 10, 20, 20),
want: pixel.ZR,
},
{
name: "Bit of overlap",
r1: pixel.R(0, 0, 10, 10),
r2: pixel.R(0, 9, 20, 20),
want: pixel.R(0, 9, 10, 10),
intersect: true,
},
{
name: "Fully overlapped",
r1: pixel.R(0, 0, 10, 10),
r2: pixel.R(0, 0, 10, 10),
want: pixel.R(0, 0, 10, 10),
intersect: true,
},
}
func TestRect_Intersect(t *testing.T) {
for _, tt := range rectIntTests {
t.Run(tt.name, func(t *testing.T) {
if got := tt.r1.Intersect(tt.r2); !reflect.DeepEqual(got, tt.want) {
t.Errorf("Rect.Intersect() = %v, want %v", got, tt.want)
}
})
}
}
func TestRect_Intersects(t *testing.T) {
for _, tt := range rectIntTests {
t.Run(tt.name, func(t *testing.T) {
if got := tt.r1.Intersects(tt.r2); got != tt.intersect {
t.Errorf("Rect.Intersects() = %v, want %v", got, tt.want)
}
})
}
}