87 lines
1.3 KiB
Go
87 lines
1.3 KiB
Go
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package draw_test
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import (
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"fmt"
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"testing"
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"git.kirsle.net/apps/doodle/draw"
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"git.kirsle.net/apps/doodle/types"
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)
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func TestLine(t *testing.T) {
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type task struct {
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X1 int32
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X2 int32
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Y1 int32
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Y2 int32
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Expect []types.Point
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}
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toString := func(t task) string {
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return fmt.Sprintf("Line<%d,%d -> %d,%d>",
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t.X1, t.Y1,
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t.X2, t.Y2,
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)
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}
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var tasks = []task{
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task{
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X1: 0,
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Y1: 0,
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X2: 0,
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Y2: 10,
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Expect: []types.Point{
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{X: 0, Y: 0},
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{X: 0, Y: 1},
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{X: 0, Y: 2},
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{X: 0, Y: 3},
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{X: 0, Y: 4},
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{X: 0, Y: 5},
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{X: 0, Y: 6},
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{X: 0, Y: 7},
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{X: 0, Y: 8},
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{X: 0, Y: 9},
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{X: 0, Y: 10},
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},
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},
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task{
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X1: 10,
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Y1: 10,
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X2: 15,
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Y2: 15,
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Expect: []types.Point{
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{X: 10, Y: 10},
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{X: 11, Y: 11},
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{X: 12, Y: 12},
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{X: 13, Y: 13},
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{X: 14, Y: 14},
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{X: 15, Y: 15},
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},
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},
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}
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for _, test := range tasks {
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gen := draw.Line(test.X1, test.Y1, test.X2, test.Y2)
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var i int
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for point := range gen {
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if i >= len(test.Expect) {
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t.Errorf("%s: Got more pixels back than expected: %s",
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toString(test),
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point,
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)
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break
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}
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expect := test.Expect[i]
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if expect != point {
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t.Errorf("%s: at index %d I got %s but expected %s",
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toString(test),
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i,
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point,
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expect,
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)
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}
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i++
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}
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}
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}
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