package render_test import ( "strconv" "testing" "git.kirsle.net/go/render" ) func TestIntersection(t *testing.T) { newRect := func(x, y, w, h int) render.Rect { return render.Rect{ X: x, Y: y, W: w, H: h, } } type TestCase struct { A render.Rect B render.Rect Expect bool } var tests = []TestCase{ { A: newRect(0, 0, 1000, 1000), B: newRect(200, 200, 100, 100), Expect: true, }, { A: newRect(200, 200, 100, 100), B: newRect(0, 0, 1000, 1000), Expect: true, }, { A: newRect(0, 0, 100, 100), B: newRect(100, 0, 100, 100), Expect: true, }, { A: newRect(0, 0, 99, 99), B: newRect(100, 0, 99, 99), Expect: false, }, { // Real coords of a test doodad! A: newRect(183, 256, 283, 356), B: newRect(0, -232, 874, 490), Expect: true, }, { A: newRect(183, 256, 283, 356), B: newRect(0, -240, 874, 490), Expect: false, // XXX: must be true }, { A: newRect(0, 30, 9, 62), B: newRect(16, 0, 32, 64), Expect: false, }, { A: newRect(0, 30, 11, 62), B: newRect(7, 4, 17, 28), Expect: true, }, } for _, test := range tests { actual := test.A.Intersects(test.B) if actual != test.Expect { t.Errorf( "%s collision with %s: expected %s, got %s", test.A, test.B, strconv.FormatBool(test.Expect), strconv.FormatBool(actual), ) } } }