1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "gm.h"
9 #include "SkCanvas.h"
10 #include "SkPath.h"
11
generate_square(SkScalar cx,SkScalar cy,SkScalar w)12 static SkPath generate_square(SkScalar cx, SkScalar cy, SkScalar w) {
13 SkRect rect = SkRect::MakeXYWH(cx - w / 2, cy - w / 2, w, w);
14 SkPath path;
15 path.addRect(rect);
16 return path;
17 }
18
generate_rect_line(SkScalar cx,SkScalar cy,SkScalar l)19 static SkPath generate_rect_line(SkScalar cx, SkScalar cy, SkScalar l) {
20 SkRect rect = SkRect::MakeXYWH(cx - l / 2, cy, l, 0);
21 SkPath path;
22 path.addRect(rect);
23 return path;
24 }
25
generate_circle(SkScalar cx,SkScalar cy,SkScalar d)26 static SkPath generate_circle(SkScalar cx, SkScalar cy, SkScalar d) {
27 SkPath path;
28 path.addCircle(cx, cy, d/2, SkPath::kCW_Direction);
29 return path;
30 }
31
generate_line(SkScalar cx,SkScalar cy,SkScalar l)32 static SkPath generate_line(SkScalar cx, SkScalar cy, SkScalar l) {
33 SkPath path;
34 path.moveTo(cx - l / 2, cy);
35 path.lineTo(cx + l / 2, cy);
36 return path;
37 }
38
39 namespace {
40 SkPaint::Style styles[] = {
41 SkPaint::kStroke_Style,
42 SkPaint::kStrokeAndFill_Style,
43 SkPaint::kFill_Style
44 };
45 SkScalar pathSizes[] = {
46 40,
47 10,
48 0
49 };
50 SkScalar strokeWidths[] = {
51 10,
52 0
53 };
54 SkPath ((*paths[])(SkScalar, SkScalar, SkScalar)) = {
55 generate_square,
56 generate_rect_line,
57 generate_circle,
58 generate_line
59 };
60
61 const SkScalar slideWidth = 90, slideHeight = 90;
62 const SkScalar slideBoundary = 5;
63
64 } // namespace
65
66 DEF_SIMPLE_GM(inverse_paths, canvas, 800, 900) {
67 SkScalar cx = slideWidth / 2 + slideBoundary;
68 SkScalar cy = slideHeight / 2 + slideBoundary;
69 SkScalar dx = slideWidth + 2 * slideBoundary;
70 SkScalar dy = slideHeight + 2 * slideBoundary;
71
72 SkRect clipRect = SkRect::MakeLTRB(slideBoundary, slideBoundary,
73 slideBoundary + slideWidth,
74 slideBoundary + slideHeight);
75 SkPaint clipPaint;
76 clipPaint.setStyle(SkPaint::kStroke_Style);
77 clipPaint.setStrokeWidth(SkIntToScalar(2));
78
79 SkPaint outlinePaint;
80 outlinePaint.setColor(0x40000000);
81 outlinePaint.setStyle(SkPaint::kStroke_Style);
82 outlinePaint.setStrokeWidth(SkIntToScalar(0));
83
84 for (size_t styleIndex = 0; styleIndex < SK_ARRAY_COUNT(styles);
85 styleIndex++) {
86 for (size_t sizeIndex = 0; sizeIndex < SK_ARRAY_COUNT(pathSizes);
87 sizeIndex++) {
88 SkScalar size = pathSizes[sizeIndex];
89
90 canvas->save();
91
92 for (size_t widthIndex = 0;
93 widthIndex < SK_ARRAY_COUNT(strokeWidths);
94 widthIndex++) {
95 SkPaint paint;
96 paint.setColor(0xff007000);
97 paint.setStrokeWidth(strokeWidths[widthIndex]);
98 paint.setStyle(styles[styleIndex]);
99
100 for (size_t pathIndex = 0;
101 pathIndex < SK_ARRAY_COUNT(paths);
102 pathIndex++) {
103 canvas->drawRect(clipRect, clipPaint);
104
105 canvas->save();
106 canvas->clipRect(clipRect);
107
108 SkPath path = paths[pathIndex](cx, cy, size);
109 path.setFillType(SkPath::kInverseWinding_FillType);
110 canvas->drawPath(path, paint);
111
112 path.setFillType(SkPath::kWinding_FillType);
113 canvas->drawPath(path, outlinePaint);
114
115 canvas->restore();
116 canvas->translate(dx, 0);
117 }
118 }
119
120 canvas->restore();
121 canvas->translate(0, dy);
122 }
123 }
124 }
125