package collision_test import ( "testing" "git.kirsle.net/go/render" "git.kirsle.net/apps/doodle/pkg/collision" ) func TestActorCollision(t *testing.T) { boxes := []render.Rect{ // 0: intersects with 1 // Expected intersection rect would be // X,Y = 90,10 // X2,Y2 = 100,99 render.Rect{ X: 0, Y: 0, W: 100, H: 100, }, // 1: intersects with 0 // Expected intersection rect would be // X,Y = 90,10 // X2,Y2 = 100,99 render.Rect{ X: 90, Y: 10, W: 100, H: 100, }, // 2: no intersection render.Rect{ X: 200, Y: 200, W: 32, H: 32, }, // 3: intersects with 4 // Expected intersection rect would be // X,Y = 240,200 // X2,Y2 = 264,231 render.Rect{ X: 233, Y: 200, W: 32, H: 32, }, // 4: intersects with 3 render.Rect{ X: 240, Y: 200, W: 32, H: 32, }, // 5: completely contains 6 and intersects 7. render.Rect{ X: 300, Y: 300, W: 1000, H: 600, }, render.Rect{ X: 450, Y: 500, W: 42, H: 42, }, render.Rect{ X: 1200, Y: 350, W: 512, H: 512, }, } assert := func(i int, result collision.BoxCollision, expectA, expectB int) { if result.A != expectA || result.B != expectB { t.Errorf( "unexpected collision at index %d of BetweenBoxes() generator\n"+ "expected: (%d,%d)\n"+ " but got: (%d,%d)", i, expectA, expectB, result.A, result.B, ) } } var i int for overlap := range collision.BetweenBoxes(boxes) { a, b := overlap.A, overlap.B // Ensure expected collisions happened. switch i { case 0: assert(i, overlap, 0, 1) case 1: assert(i, overlap, 1, 0) case 2: assert(i, overlap, 3, 4) case 3: assert(i, overlap, 4, 3) case 4: assert(i, overlap, 5, 6) case 5: assert(i, overlap, 5, 7) case 6: assert(i, overlap, 6, 5) case 7: assert(i, overlap, 7, 5) default: t.Errorf("got unexpected collision result, index %d, tuple (%d,%d)", i, a, b, ) } i++ } }