649 lines
18 KiB
Go
649 lines
18 KiB
Go
package pixel_test
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import (
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"fmt"
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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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"github.com/stretchr/testify/assert"
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)
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func TestRect_Resize(t *testing.T) {
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type rectTestTransform struct {
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name string
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f func(pixel.Rect) pixel.Rect
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}
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// rectangles
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squareAroundOrigin := pixel.R(-10, -10, 10, 10)
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squareAround2020 := pixel.R(10, 10, 30, 30)
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rectangleAroundOrigin := pixel.R(-20, -10, 20, 10)
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rectangleAround2020 := pixel.R(0, 10, 40, 30)
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// resize transformations
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resizeByHalfAroundCenter := rectTestTransform{"by half around center", func(rect pixel.Rect) pixel.Rect {
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return rect.Resized(rect.Center(), rect.Size().Scaled(0.5))
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}}
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resizeByHalfAroundMin := rectTestTransform{"by half around Min", func(rect pixel.Rect) pixel.Rect {
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return rect.Resized(rect.Min, rect.Size().Scaled(0.5))
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}}
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resizeByHalfAroundMax := rectTestTransform{"by half around Max", func(rect pixel.Rect) pixel.Rect {
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return rect.Resized(rect.Max, rect.Size().Scaled(0.5))
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}}
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resizeByHalfAroundMiddleOfLeftSide := rectTestTransform{"by half around middle of left side", func(rect pixel.Rect) pixel.Rect {
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return rect.Resized(pixel.V(rect.Min.X, rect.Center().Y), rect.Size().Scaled(0.5))
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}}
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resizeByHalfAroundOrigin := rectTestTransform{"by half around the origin", func(rect pixel.Rect) pixel.Rect {
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return rect.Resized(pixel.ZV, rect.Size().Scaled(0.5))
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}}
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testCases := []struct {
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input pixel.Rect
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transform rectTestTransform
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answer pixel.Rect
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}{
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{squareAroundOrigin, resizeByHalfAroundCenter, pixel.R(-5, -5, 5, 5)},
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{squareAround2020, resizeByHalfAroundCenter, pixel.R(15, 15, 25, 25)},
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{rectangleAroundOrigin, resizeByHalfAroundCenter, pixel.R(-10, -5, 10, 5)},
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{rectangleAround2020, resizeByHalfAroundCenter, pixel.R(10, 15, 30, 25)},
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{squareAroundOrigin, resizeByHalfAroundMin, pixel.R(-10, -10, 0, 0)},
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{squareAround2020, resizeByHalfAroundMin, pixel.R(10, 10, 20, 20)},
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{rectangleAroundOrigin, resizeByHalfAroundMin, pixel.R(-20, -10, 0, 0)},
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{rectangleAround2020, resizeByHalfAroundMin, pixel.R(0, 10, 20, 20)},
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{squareAroundOrigin, resizeByHalfAroundMax, pixel.R(0, 0, 10, 10)},
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{squareAround2020, resizeByHalfAroundMax, pixel.R(20, 20, 30, 30)},
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{rectangleAroundOrigin, resizeByHalfAroundMax, pixel.R(0, 0, 20, 10)},
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{rectangleAround2020, resizeByHalfAroundMax, pixel.R(20, 20, 40, 30)},
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{squareAroundOrigin, resizeByHalfAroundMiddleOfLeftSide, pixel.R(-10, -5, 0, 5)},
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{squareAround2020, resizeByHalfAroundMiddleOfLeftSide, pixel.R(10, 15, 20, 25)},
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{rectangleAroundOrigin, resizeByHalfAroundMiddleOfLeftSide, pixel.R(-20, -5, 0, 5)},
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{rectangleAround2020, resizeByHalfAroundMiddleOfLeftSide, pixel.R(0, 15, 20, 25)},
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{squareAroundOrigin, resizeByHalfAroundOrigin, pixel.R(-5, -5, 5, 5)},
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{squareAround2020, resizeByHalfAroundOrigin, pixel.R(5, 5, 15, 15)},
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{rectangleAroundOrigin, resizeByHalfAroundOrigin, pixel.R(-10, -5, 10, 5)},
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{rectangleAround2020, resizeByHalfAroundOrigin, pixel.R(0, 5, 20, 15)},
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}
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for _, testCase := range testCases {
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t.Run(fmt.Sprintf("Resize %v %s", testCase.input, testCase.transform.name), func(t *testing.T) {
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testResult := testCase.transform.f(testCase.input)
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if testResult != testCase.answer {
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t.Errorf("Got: %v, wanted: %v\n", testResult, testCase.answer)
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}
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})
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}
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}
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func TestMatrix_Unproject(t *testing.T) {
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const delta = 1e-15
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t.Run("for rotated matrix", func(t *testing.T) {
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matrix := pixel.IM.
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Rotated(pixel.ZV, math.Pi/2)
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unprojected := matrix.Unproject(pixel.V(0, 1))
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assert.InDelta(t, unprojected.X, 1, delta)
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assert.InDelta(t, unprojected.Y, 0, delta)
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})
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t.Run("for moved matrix", func(t *testing.T) {
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matrix := pixel.IM.
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Moved(pixel.V(1, 2))
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unprojected := matrix.Unproject(pixel.V(2, 5))
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assert.InDelta(t, unprojected.X, 1, delta)
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assert.InDelta(t, unprojected.Y, 3, delta)
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})
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t.Run("for scaled matrix", func(t *testing.T) {
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matrix := pixel.IM.
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Scaled(pixel.ZV, 2)
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unprojected := matrix.Unproject(pixel.V(2, 4))
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assert.InDelta(t, unprojected.X, 1, delta)
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assert.InDelta(t, unprojected.Y, 2, delta)
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})
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t.Run("for scaled, rotated and moved matrix", func(t *testing.T) {
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matrix := pixel.IM.
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Scaled(pixel.ZV, 2).
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Rotated(pixel.ZV, math.Pi/2).
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Moved(pixel.V(2, 2))
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unprojected := matrix.Unproject(pixel.V(-2, 6))
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assert.InDelta(t, unprojected.X, 2, delta)
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assert.InDelta(t, unprojected.Y, 2, delta)
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})
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t.Run("for rotated and moved matrix", func(t *testing.T) {
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matrix := pixel.IM.
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Rotated(pixel.ZV, math.Pi/2).
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Moved(pixel.V(1, 1))
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unprojected := matrix.Unproject(pixel.V(1, 2))
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assert.InDelta(t, unprojected.X, 1, delta)
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assert.InDelta(t, unprojected.Y, 0, delta)
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})
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t.Run("for projected vertices using all kinds of matrices", func(t *testing.T) {
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namedMatrices := map[string]pixel.Matrix{
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"IM": pixel.IM,
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"Scaled": pixel.IM.Scaled(pixel.ZV, 0.5),
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"Scaled x 2": pixel.IM.Scaled(pixel.ZV, 2),
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"Rotated": pixel.IM.Rotated(pixel.ZV, math.Pi/4),
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"Moved": pixel.IM.Moved(pixel.V(0.5, 1)),
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"Moved 2": pixel.IM.Moved(pixel.V(-1, -0.5)),
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"Scaled and Rotated": pixel.IM.Scaled(pixel.ZV, 0.5).Rotated(pixel.ZV, math.Pi/4),
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"Scaled, Rotated and Moved": pixel.IM.Scaled(pixel.ZV, 0.5).Rotated(pixel.ZV, math.Pi/4).Moved(pixel.V(1, 2)),
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"Rotated and Moved": pixel.IM.Rotated(pixel.ZV, math.Pi/4).Moved(pixel.V(1, 2)),
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}
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vertices := [...]pixel.Vec{
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pixel.V(0, 0),
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pixel.V(5, 0),
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pixel.V(5, 10),
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pixel.V(0, 10),
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pixel.V(-5, 10),
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pixel.V(-5, 0),
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pixel.V(-5, -10),
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pixel.V(0, -10),
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pixel.V(5, -10),
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}
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for matrixName, matrix := range namedMatrices {
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for _, vertex := range vertices {
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testCase := fmt.Sprintf("for matrix %s and vertex %v", matrixName, vertex)
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t.Run(testCase, func(t *testing.T) {
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projected := matrix.Project(vertex)
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unprojected := matrix.Unproject(projected)
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assert.InDelta(t, vertex.X, unprojected.X, delta)
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assert.InDelta(t, vertex.Y, unprojected.Y, delta)
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})
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}
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}
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})
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t.Run("for singular matrix", func(t *testing.T) {
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matrix := pixel.Matrix{0, 0, 0, 0, 0, 0}
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unprojected := matrix.Unproject(pixel.ZV)
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assert.True(t, math.IsNaN(unprojected.X))
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assert.True(t, math.IsNaN(unprojected.Y))
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})
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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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}
|
|
}
|
|
|
|
func TestCircle_Intersect(t *testing.T) {
|
|
type fields struct {
|
|
radius float64
|
|
center pixel.Vec
|
|
}
|
|
type args struct {
|
|
d pixel.Circle
|
|
}
|
|
tests := []struct {
|
|
name string
|
|
fields fields
|
|
args args
|
|
want pixel.Circle
|
|
}{
|
|
{
|
|
name: "Circle.Intersect(): intersecting circles",
|
|
fields: fields{radius: 1, center: pixel.ZV},
|
|
args: args{d: pixel.C(pixel.V(1, 0), 1)},
|
|
want: pixel.C(pixel.V(0.5, 0), 1),
|
|
},
|
|
{
|
|
name: "Circle.Intersect(): non-intersecting circles",
|
|
fields: fields{radius: 1, center: pixel.ZV},
|
|
args: args{d: pixel.C(pixel.V(3, 3), 1)},
|
|
want: pixel.C(pixel.V(1.5, 1.5), 0),
|
|
},
|
|
{
|
|
name: "Circle.Intersect(): first circle encompassing second",
|
|
fields: fields{radius: 10, center: pixel.ZV},
|
|
args: args{d: pixel.C(pixel.V(3, 3), 1)},
|
|
want: pixel.C(pixel.ZV, 10),
|
|
},
|
|
{
|
|
name: "Circle.Intersect(): second circle encompassing first",
|
|
fields: fields{radius: 1, center: pixel.V(-1, -4)},
|
|
args: args{d: pixel.C(pixel.ZV, 10)},
|
|
want: pixel.C(pixel.ZV, 10),
|
|
},
|
|
{
|
|
name: "Circle.Intersect(): matching circles",
|
|
fields: fields{radius: 1, center: pixel.ZV},
|
|
args: args{d: pixel.C(pixel.ZV, 1)},
|
|
want: pixel.C(pixel.ZV, 1),
|
|
},
|
|
}
|
|
for _, tt := range tests {
|
|
t.Run(tt.name, func(t *testing.T) {
|
|
c := pixel.C(
|
|
tt.fields.center,
|
|
tt.fields.radius,
|
|
)
|
|
if got := c.Intersect(tt.args.d); !reflect.DeepEqual(got, tt.want) {
|
|
t.Errorf("Circle.Intersect() = %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, 0), 1)},
|
|
want: pixel.V(1, 0),
|
|
},
|
|
{
|
|
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, 10), 1)},
|
|
want: pixel.V(1, 0),
|
|
},
|
|
{
|
|
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, 0), 1)},
|
|
want: pixel.V(-1, 0),
|
|
},
|
|
{
|
|
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, 10), 1)},
|
|
want: pixel.V(-1, 0),
|
|
},
|
|
{
|
|
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",
|
|
fields: fields{Min: pixel.ZV, Max: pixel.V(10, 10)},
|
|
args: args{c: pixel.C(pixel.V(-1, 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,
|
|
}
|
|
if got := r.IntersectCircle(tt.args.c); got != tt.want {
|
|
t.Errorf("Rect.IntersectCircle() = %v, want %v", got, tt.want)
|
|
}
|
|
})
|
|
}
|
|
}
|