| // Copyright 2016 The Go Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file. |
| |
| package vector |
| |
| // TODO: add tests for NaN and Inf coordinates. |
| |
| import ( |
| "image" |
| "image/draw" |
| "image/png" |
| "os" |
| "testing" |
| |
| "golang.org/x/image/math/f32" |
| ) |
| |
| // encodePNG is useful for manually debugging the tests. |
| func encodePNG(dstFilename string, src image.Image) error { |
| f, err := os.Create(dstFilename) |
| if err != nil { |
| return err |
| } |
| encErr := png.Encode(f, src) |
| closeErr := f.Close() |
| if encErr != nil { |
| return encErr |
| } |
| return closeErr |
| } |
| |
| func TestBasicPath(t *testing.T) { |
| want := []byte{ |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xe3, 0xaa, 0x3e, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfa, 0x5f, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x24, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xa1, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xfc, 0x14, 0x00, 0x00, |
| 0x00, 0x00, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x4a, 0x00, 0x00, |
| 0x00, 0x00, 0xcc, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0x81, 0x00, 0x00, |
| 0x00, 0x00, 0x66, 0xff, 0xff, 0xff, 0xff, 0xff, 0xef, 0xe4, 0xff, 0xff, 0xff, 0xb6, 0x00, 0x00, |
| 0x00, 0x00, 0x0c, 0xf2, 0xff, 0xff, 0xfe, 0x9e, 0x15, 0x00, 0x15, 0x96, 0xff, 0xce, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x88, 0xfc, 0xe3, 0x43, 0x00, 0x00, 0x00, 0x00, 0x06, 0xcd, 0xdc, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x10, 0x0f, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x25, 0xde, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x56, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, |
| } |
| |
| z := NewRasterizer(16, 16) |
| z.MoveTo(f32.Vec2{2, 2}) |
| z.LineTo(f32.Vec2{8, 2}) |
| z.QuadTo(f32.Vec2{14, 2}, f32.Vec2{14, 14}) |
| z.CubeTo(f32.Vec2{8, 2}, f32.Vec2{5, 20}, f32.Vec2{2, 8}) |
| z.ClosePath() |
| |
| dst := image.NewAlpha(z.Bounds()) |
| z.DrawOp = draw.Src |
| z.Draw(dst, dst.Bounds(), image.Opaque, image.Point{}) |
| |
| got := dst.Pix |
| if len(got) != len(want) { |
| t.Fatalf("len(got)=%d and len(want)=%d differ", len(got), len(want)) |
| } |
| for i := range got { |
| delta := int(got[i]) - int(want[i]) |
| // The +/- 2 allows different implementations to give different |
| // rounding errors. |
| if delta < -2 || +2 < delta { |
| t.Errorf("i=%d: got %#02x, want %#02x", i, got[i], want[i]) |
| } |
| } |
| } |