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1 /* | 1 /* |
2 * Copyright 2016 Google Inc. | 2 * Copyright 2016 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include <functional> | 8 #include <functional> |
9 #include "SkCanvas.h" | 9 #include "SkCanvas.h" |
10 #include "gm.h" | 10 #include "gm.h" |
11 | 11 |
12 static constexpr SkScalar kStarts[] = {0.f, 10.f, 30.f, 45.f, 90.f, 165.f, 180.f
, 270.f}; | 12 static constexpr SkScalar kStarts[] = {0.f, 10.f, 30.f, 45.f, 90.f, 165.f, 180.f
, 270.f}; |
13 static constexpr SkScalar kSweeps[] = {45.f, 90.f, 165.f, 180.f, 220.f, 270.f, 3
00.f, 315.f}; | 13 static constexpr SkScalar kSweeps[] = {45.f, 90.f, 165.f, 180.f, 220.f, 270.f, 3
00.f, 315.f}; |
14 static constexpr SkScalar kDiameter = 40.f; | 14 static constexpr SkScalar kDiameter = 40.f; |
15 static constexpr SkRect kRect = {0.f, 0.f, kDiameter, kDiameter}; | 15 static constexpr SkRect kRect = {0.f, 0.f, kDiameter, kDiameter}; |
16 static constexpr int kW = 1000; | 16 static constexpr int kW = 1000; |
17 static constexpr int kH = 1000; | 17 static constexpr int kH = 1000; |
18 static constexpr SkScalar kPad = 20.f; | 18 static constexpr SkScalar kPad = 20.f; |
19 | 19 |
20 void draw_arcs(SkCanvas* canvas, std::function<void(SkPaint*)> configureStyle) { | 20 void draw_arcs(SkCanvas* canvas, std::function<void(SkPaint*)> configureStyle) { |
21 // Draws grid of arcs with different start/sweep angles in red and their com
plement arcs in | 21 // Draws grid of arcs with different start/sweep angles in red and their com
plement arcs in |
22 // blue. | 22 // blue. |
23 auto drawGrid = [canvas, &configureStyle] (SkScalar x, SkScalar y, bool useC
enter, bool aa) { | 23 auto drawGrid = [canvas, &configureStyle] (SkScalar x, SkScalar y, bool useC
enter, bool aa) { |
24 SkPaint p0; | 24 SkPaint p0; |
25 p0.setColor(SK_ColorRED); | 25 p0.setColor(SK_ColorRED); |
26 p0.setAntiAlias(aa); | 26 p0.setAntiAlias(aa); |
27 // Set a reasonable stroke width that configureStyle can override. | 27 // Set a reasonable stroke width that configureStyle can override. |
28 p0.setStrokeWidth(15.f); | 28 p0.setStrokeWidth(15.f); |
| 29 SkPaint p1 = p0; |
| 30 p1.setColor(SK_ColorBLUE); |
29 // Use alpha so we see magenta on overlap between arc and its complement
. | 31 // Use alpha so we see magenta on overlap between arc and its complement
. |
30 p0.setAlpha(100); | 32 p0.setAlpha(100); |
31 SkPaint p1 = p0; | 33 p1.setAlpha(100); |
32 p1.setColor(SK_ColorBLUE); | |
33 configureStyle(&p0); | 34 configureStyle(&p0); |
34 configureStyle(&p1); | 35 configureStyle(&p1); |
35 | 36 |
36 canvas->save(); | 37 canvas->save(); |
37 canvas->translate(kPad + x, kPad + y); | 38 canvas->translate(kPad + x, kPad + y); |
38 for (auto start : kStarts) { | 39 for (auto start : kStarts) { |
39 canvas->save(); | 40 canvas->save(); |
40 for (auto sweep : kSweeps) { | 41 for (auto sweep : kSweeps) { |
41 canvas->drawArc(kRect, start, sweep, useCenter, p0); | 42 canvas->drawArc(kRect, start, sweep, useCenter, p0); |
42 canvas->drawArc(kRect, start, -(360.f - sweep), useCenter, p1); | 43 canvas->drawArc(kRect, start, -(360.f - sweep), useCenter, p1); |
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57 // Draw separators between the grids. | 58 // Draw separators between the grids. |
58 SkPaint linePaint; | 59 SkPaint linePaint; |
59 linePaint.setAntiAlias(true); | 60 linePaint.setAntiAlias(true); |
60 linePaint.setColor(SK_ColorBLACK); | 61 linePaint.setColor(SK_ColorBLACK); |
61 canvas->drawLine(kGridW, 0.f , kGridW, SkIntToScalar(kH), lineP
aint); | 62 canvas->drawLine(kGridW, 0.f , kGridW, SkIntToScalar(kH), lineP
aint); |
62 canvas->drawLine(0.f , kGridH, SkIntToScalar(kW), kGridH, lineP
aint); | 63 canvas->drawLine(0.f , kGridH, SkIntToScalar(kW), kGridH, lineP
aint); |
63 } | 64 } |
64 | 65 |
65 #define DEF_ARC_GM(name) DEF_SIMPLE_GM(circular_arcs_##name, canvas, kW, kH) | 66 #define DEF_ARC_GM(name) DEF_SIMPLE_GM(circular_arcs_##name, canvas, kW, kH) |
66 | 67 |
67 DEF_ARC_GM(circular_arcs_fill) { | 68 DEF_ARC_GM(fill) { |
68 auto setFill = [] (SkPaint*p) { p->setStyle(SkPaint::kFill_Style); }; | 69 auto setFill = [] (SkPaint*p) { p->setStyle(SkPaint::kFill_Style); }; |
69 draw_arcs(canvas, setFill); | 70 draw_arcs(canvas, setFill); |
70 } | 71 } |
71 | 72 |
72 DEF_ARC_GM(hairline) { | 73 DEF_ARC_GM(hairline) { |
73 auto setHairline = [] (SkPaint* p) { | 74 auto setHairline = [] (SkPaint* p) { |
74 p->setStyle(SkPaint::kStroke_Style); | 75 p->setStyle(SkPaint::kStroke_Style); |
75 p->setStrokeWidth(0.f); | 76 p->setStrokeWidth(0.f); |
76 }; | 77 }; |
77 draw_arcs(canvas, setHairline); | 78 draw_arcs(canvas, setHairline); |
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93 draw_arcs(canvas, setStroke); | 94 draw_arcs(canvas, setStroke); |
94 } | 95 } |
95 | 96 |
96 DEF_ARC_GM(stroke_round) { | 97 DEF_ARC_GM(stroke_round) { |
97 auto setStroke = [] (SkPaint* p) { | 98 auto setStroke = [] (SkPaint* p) { |
98 p->setStyle(SkPaint::kStroke_Style); | 99 p->setStyle(SkPaint::kStroke_Style); |
99 p->setStrokeCap(SkPaint::kRound_Cap); | 100 p->setStrokeCap(SkPaint::kRound_Cap); |
100 }; | 101 }; |
101 draw_arcs(canvas, setStroke); | 102 draw_arcs(canvas, setStroke); |
102 } | 103 } |
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