A rendering engine library for Go supporting both SDL2 and WebAssembly (HTML Canvas) targets.
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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),
)
}
}
}