1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
|
/*
* Copyright 2016 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include <functional>
#include "SkCanvas.h"
#include "SkDashPathEffect.h"
#include "gm.h"
constexpr SkScalar kStarts[] = {0.f, 10.f, 30.f, 45.f, 90.f, 165.f, 180.f, 270.f};
constexpr SkScalar kSweeps[] = {1.f, 45.f, 90.f, 130.f, 180.f, 184.f, 300.f, 355.f};
constexpr SkScalar kDiameter = 40.f;
constexpr SkRect kRect = {0.f, 0.f, kDiameter, kDiameter};
constexpr int kW = 1000;
constexpr int kH = 1000;
constexpr SkScalar kPad = 20.f;
void draw_arcs(SkCanvas* canvas, std::function<void(SkPaint*)> configureStyle) {
// Draws grid of arcs with different start/sweep angles in red and their complement arcs in
// blue.
auto drawGrid = [canvas, &configureStyle] (SkScalar x, SkScalar y, bool useCenter, bool aa) {
SkPaint p0;
p0.setColor(SK_ColorRED);
p0.setAntiAlias(aa);
// Set a reasonable stroke width that configureStyle can override.
p0.setStrokeWidth(15.f);
SkPaint p1 = p0;
p1.setColor(SK_ColorBLUE);
// Use alpha so we see magenta on overlap between arc and its complement.
p0.setAlpha(100);
p1.setAlpha(100);
configureStyle(&p0);
configureStyle(&p1);
canvas->save();
canvas->translate(kPad + x, kPad + y);
for (auto start : kStarts) {
canvas->save();
for (auto sweep : kSweeps) {
canvas->drawArc(kRect, start, sweep, useCenter, p0);
canvas->drawArc(kRect, start, -(360.f - sweep), useCenter, p1);
canvas->translate(kRect.width() + kPad, 0.f);
}
canvas->restore();
canvas->translate(0, kRect.height() + kPad);
}
canvas->restore();
};
// Draw a grids for combo of enabling/disabling aa and using center.
constexpr SkScalar kGridW = kW / 2.f;
constexpr SkScalar kGridH = kH / 2.f;
drawGrid(0.f , 0.f , false, false);
drawGrid(kGridW, 0.f , true , false);
drawGrid(0.f , kGridH, false, true );
drawGrid(kGridW, kGridH, true , true );
// Draw separators between the grids.
SkPaint linePaint;
linePaint.setAntiAlias(true);
linePaint.setColor(SK_ColorBLACK);
canvas->drawLine(kGridW, 0.f , kGridW, SkIntToScalar(kH), linePaint);
canvas->drawLine(0.f , kGridH, SkIntToScalar(kW), kGridH, linePaint);
}
#define DEF_ARC_GM(name) DEF_SIMPLE_GM(circular_arcs_##name, canvas, kW, kH)
DEF_ARC_GM(fill) {
auto setFill = [] (SkPaint*p) { p->setStyle(SkPaint::kFill_Style); };
draw_arcs(canvas, setFill);
}
DEF_ARC_GM(hairline) {
auto setHairline = [] (SkPaint* p) {
p->setStyle(SkPaint::kStroke_Style);
p->setStrokeWidth(0.f);
};
draw_arcs(canvas, setHairline);
}
DEF_ARC_GM(stroke_butt) {
auto setStroke = [](SkPaint* p) {
p->setStyle(SkPaint::kStroke_Style);
p->setStrokeCap(SkPaint::kButt_Cap);
};
draw_arcs(canvas, setStroke);
}
DEF_ARC_GM(stroke_square) {
auto setStroke = [] (SkPaint* p) {
p->setStyle(SkPaint::kStroke_Style);
p->setStrokeCap(SkPaint::kSquare_Cap);
};
draw_arcs(canvas, setStroke);
}
DEF_ARC_GM(stroke_round) {
auto setStroke = [] (SkPaint* p) {
p->setStyle(SkPaint::kStroke_Style);
p->setStrokeCap(SkPaint::kRound_Cap);
};
draw_arcs(canvas, setStroke);
}
DEF_ARC_GM(stroke_and_fill_butt) {
auto setStroke = [] (SkPaint* p) {
p->setStyle(SkPaint::kStrokeAndFill_Style);
p->setStrokeCap(SkPaint::kButt_Cap);
};
draw_arcs(canvas, setStroke);
}
DEF_ARC_GM(stroke_and_fill_square) {
auto setStroke = [] (SkPaint* p) {
p->setStyle(SkPaint::kStrokeAndFill_Style);
p->setStrokeCap(SkPaint::kSquare_Cap);
};
draw_arcs(canvas, setStroke);
}
DEF_ARC_GM(stroke_and_fill_round) {
auto setStroke = [] (SkPaint* p) {
p->setStyle(SkPaint::kStrokeAndFill_Style);
p->setStrokeCap(SkPaint::kRound_Cap);
};
draw_arcs(canvas, setStroke);
}
DEF_SIMPLE_GM(circular_arcs_weird, canvas, 1000, 400) {
constexpr SkScalar kS = 50;
struct Arc {
SkRect fOval;
SkScalar fStart;
SkScalar fSweep;
};
const Arc noDrawArcs[] = {
// no sweep
{SkRect::MakeWH(kS, kS), 0, 0},
// empty rect in x
{SkRect::MakeWH(-kS, kS), 0, 90},
// empty rect in y
{SkRect::MakeWH(kS, -kS), 0, 90},
// empty rect in x and y
{SkRect::MakeWH( 0, 0), 0, 90},
};
const Arc arcs[] = {
// large start
{SkRect::MakeWH(kS, kS), 810.f, 90.f},
// large negative start
{SkRect::MakeWH(kS, kS), -810.f, 90.f},
// exactly 360 sweep
{SkRect::MakeWH(kS, kS), 0.f, 360.f},
// exactly -360 sweep
{SkRect::MakeWH(kS, kS), 0.f, -360.f},
// exactly 540 sweep
{SkRect::MakeWH(kS, kS), 0.f, 540.f},
// exactly -540 sweep
{SkRect::MakeWH(kS, kS), 0.f, -540.f},
// generic large sweep and large start
{SkRect::MakeWH(kS, kS), 1125.f, 990.f},
};
SkTArray<SkPaint> paints;
// fill
paints.push_back();
// stroke
paints.push_back().setStyle(SkPaint::kStroke_Style);
paints.back().setStrokeWidth(kS / 6.f);
// hairline
paints.push_back().setStyle(SkPaint::kStroke_Style);
paints.back().setStrokeWidth(0.f);
// stroke and fill
paints.push_back().setStyle(SkPaint::kStrokeAndFill_Style);
paints.back().setStrokeWidth(kS / 6.f);
// dash effect
paints.push_back().setStyle(SkPaint::kStroke_Style);
paints.back().setStrokeWidth(kS / 6.f);
constexpr SkScalar kDashIntervals[] = {kS / 15, 2 * kS / 15};
paints.back().setPathEffect(SkDashPathEffect::Make(kDashIntervals, 2, 0.f));
canvas->translate(kPad, kPad);
// This loop should draw nothing.
for (auto arc : noDrawArcs) {
for (auto paint : paints) {
paint.setAntiAlias(true);
canvas->drawArc(arc.fOval, arc.fStart, arc.fSweep, false, paint);
canvas->drawArc(arc.fOval, arc.fStart, arc.fSweep, true, paint);
}
}
SkPaint linePaint;
linePaint.setAntiAlias(true);
linePaint.setColor(SK_ColorRED);
SkScalar midX = SK_ARRAY_COUNT(arcs) * (kS + kPad) - kPad/2.f;
SkScalar height = paints.count() * (kS + kPad);
canvas->drawLine(midX, -kPad, midX, height, linePaint);
for (auto paint : paints) {
paint.setAntiAlias(true);
canvas->save();
for (auto arc : arcs) {
canvas->drawArc(arc.fOval, arc.fStart, arc.fSweep, false, paint);
canvas->translate(kS + kPad, 0.f);
}
for (auto arc : arcs) {
canvas->drawArc(arc.fOval, arc.fStart, arc.fSweep, true, paint);
canvas->translate(kS + kPad, 0.f);
}
canvas->restore();
canvas->translate(0, kS + kPad);
}
}
DEF_SIMPLE_GM(onebadarc, canvas, 100, 100) {
SkPath path;
path.moveTo(SkBits2Float(0x41a00000), SkBits2Float(0x41a00000)); // 20, 20
path.lineTo(SkBits2Float(0x4208918c), SkBits2Float(0x4208918c)); // 34.1421f, 34.1421f
path.conicTo(SkBits2Float(0x41a00000), SkBits2Float(0x42412318), // 20, 48.2843f
SkBits2Float(0x40bb73a0), SkBits2Float(0x4208918c), // 5.85786f, 34.1421f
SkBits2Float(0x3f3504f3)); // 0.707107f
path.quadTo(SkBits2Float(0x40bb73a0), SkBits2Float(0x4208918c), // 5.85786f, 34.1421f
SkBits2Float(0x40bb73a2), SkBits2Float(0x4208918c)); // 5.85787f, 34.1421f
path.lineTo(SkBits2Float(0x41a00000), SkBits2Float(0x41a00000)); // 20, 20
path.close();
SkPaint p0;
p0.setColor(SK_ColorRED);
p0.setStrokeWidth(15.f);
p0.setStyle(SkPaint::kStroke_Style);
p0.setAlpha(100);
canvas->translate(20, 0);
canvas->drawPath(path, p0);
SkRect kRect = { 60, 0, 100, 40};
canvas->drawArc(kRect, 45, 90, true, p0);
}
|
