Merge pull request #70 from PlainSight/improve-geo-tests
Improve geometry tests
This commit is contained in:
Michal Štrba
GitHub
commit
a151e31929
147
geometry_test.go
147
geometry_test.go
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@ -1,94 +1,79 @@
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package pixel_test
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import (
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"fmt"
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"testing"
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"github.com/faiface/pixel"
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)
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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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func TestResizeRect(t *testing.T) {
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testCases := []pixel.Rect{
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pixel.R(-10, -10, 10, 10),
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pixel.R(10, 10, 30, 30),
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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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resizeAroundCenterAnswers := []pixel.Rect{
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pixel.R(-5, -5, 5, 5),
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pixel.R(15, 15, 25, 25),
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}
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for i, rect := range testCases {
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answer := resizeAroundCenterAnswers[i]
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// resize rectangle by 50% anchored at it's current center point
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resizedRect := rect.Resized(rect.Center(), rect.Size().Scaled(0.5))
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if resizedRect != answer {
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t.Errorf("Rectangle resize was incorrect, got %v, want: %v.", resizedRect, answer)
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}
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}
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resizeAroundMinAnswers := []pixel.Rect{
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pixel.R(-10, -10, 0, 0),
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pixel.R(10, 10, 20, 20),
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}
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for i, rect := range testCases {
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answer := resizeAroundMinAnswers[i]
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// resize rectangle by 50% anchored at it's Min coordinate
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resizedRect := rect.Resized(rect.Min, rect.Size().Scaled(0.5))
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if resizedRect != answer {
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t.Errorf("Rectangle resize was incorrect, got %v, want: %v.", resizedRect, answer)
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}
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}
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resizeAroundMaxAnswers := []pixel.Rect{
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pixel.R(0, 0, 10, 10),
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pixel.R(20, 20, 30, 30),
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}
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for i, rect := range testCases {
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answer := resizeAroundMaxAnswers[i]
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// resize rectangle by 50% anchored at it's Max coordinate
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resizedRect := rect.Resized(rect.Max, rect.Size().Scaled(0.5))
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if resizedRect != answer {
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t.Errorf("Rectangle resize was incorrect, got %v, want: %v.", resizedRect, answer)
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}
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}
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resizeAroundMiddleOfLeftSideAnswers := []pixel.Rect{
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pixel.R(-10, -5, 0, 5),
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pixel.R(10, 15, 20, 25),
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}
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for i, rect := range testCases {
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answer := resizeAroundMiddleOfLeftSideAnswers[i]
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// resize rectangle by 50% anchored at the middle of it's left side
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resizedRect := rect.Resized(pixel.V(rect.Min.X, rect.Center().Y), rect.Size().Scaled(0.5))
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if resizedRect != answer {
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t.Errorf("Rectangle resize was incorrect, got %v, want: %v.", resizedRect, answer)
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}
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}
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resizeAroundOriginAnswers := []pixel.Rect{
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pixel.R(-5, -5, 5, 5),
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pixel.R(5, 5, 15, 15),
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}
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for i, rect := range testCases {
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answer := resizeAroundOriginAnswers[i]
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// resize rectangle by 50% anchored at the origin
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resizedRect := rect.Resized(pixel.ZV, rect.Size().Scaled(0.5))
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if resizedRect != answer {
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t.Errorf("Rectangle resize was incorrect, got %v, want: %v.", resizedRect, answer)
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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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