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
|
/*
* Copyright 2013 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "gm.h"
#include "SkCanvas.h"
#include "SkPath.h"
#include "SkRandom.h"
#include "SkScalar.h"
#include "SkTArray.h"
namespace skiagm {
// This GM tests a grab-bag of convex and concave polygons. They are triangles,
// trapezoid, diamond, polygons with lots of edges, several concave polygons...
// But rectangles are excluded.
class PolygonsGM: public GM {
public:
PolygonsGM() {}
protected:
uint32_t onGetFlags() const SK_OVERRIDE {
return kSkipTiled_Flag;
}
SkString onShortName() SK_OVERRIDE {
return SkString("polygons");
}
SkISize onISize() SK_OVERRIDE {
int width = kNumPolygons * kCellSize + 40;
int height = (kNumJoins * kNumStrokeWidths + kNumExtraStyles) * kCellSize + 40;
return SkISize::Make(width, height);
}
// Construct all polygons
void onOnceBeforeDraw() SK_OVERRIDE {
SkPoint p0[] = {{0, 0}, {60, 0}, {90, 40}}; // triangle
SkPoint p1[] = {{0, 0}, {0, 40}, {60, 40}, {40, 0}}; // trapezoid
SkPoint p2[] = {{0, 0}, {40, 40}, {80, 40}, {40, 0}}; // diamond
SkPoint p3[] = {{10, 0}, {50, 0}, {60, 10}, {60, 30}, {50, 40},
{10, 40}, {0, 30}, {0, 10}}; // octagon
SkPoint p4[32]; // circle-like polygons with 32-edges.
SkPoint p5[] = {{0, 0}, {20, 20}, {0, 40}, {60, 20}}; // concave polygon with 4 edges
SkPoint p6[] = {{0, 40}, {0, 30}, {15, 30}, {15, 20}, {30, 20},
{30, 10}, {45, 10}, {45, 0}, {60, 0}, {60, 40}}; // stairs-like polygon
SkPoint p7[] = {{0, 20}, {20, 20}, {30, 0}, {40, 20}, {60, 20},
{45, 30}, {55, 50}, {30, 40}, {5, 50}, {15, 30}}; // five-point stars
for (size_t i = 0; i < SK_ARRAY_COUNT(p4); ++i) {
SkScalar angle = 2 * SK_ScalarPI * i / SK_ARRAY_COUNT(p4);
p4[i].set(20 * SkScalarCos(angle) + 20, 20 * SkScalarSin(angle) + 20);
}
struct Polygons {
SkPoint* fPoints;
size_t fPointNum;
} pgs[] = {
{ p0, SK_ARRAY_COUNT(p0) },
{ p1, SK_ARRAY_COUNT(p1) },
{ p2, SK_ARRAY_COUNT(p2) },
{ p3, SK_ARRAY_COUNT(p3) },
{ p4, SK_ARRAY_COUNT(p4) },
{ p5, SK_ARRAY_COUNT(p5) },
{ p6, SK_ARRAY_COUNT(p6) },
{ p7, SK_ARRAY_COUNT(p7) }
};
SkASSERT(SK_ARRAY_COUNT(pgs) == kNumPolygons);
for (size_t pgIndex = 0; pgIndex < SK_ARRAY_COUNT(pgs); ++pgIndex) {
fPolygons.push_back().moveTo(pgs[pgIndex].fPoints[0].fX,
pgs[pgIndex].fPoints[0].fY);
for (size_t ptIndex = 1; ptIndex < pgs[pgIndex].fPointNum; ++ptIndex) {
fPolygons.back().lineTo(pgs[pgIndex].fPoints[ptIndex].fX,
pgs[pgIndex].fPoints[ptIndex].fY);
}
fPolygons.back().close();
}
}
// Set the location for the current test on the canvas
static void SetLocation(SkCanvas* canvas, int counter, int lineNum) {
SkScalar x = SK_Scalar1 * kCellSize * (counter % lineNum) + 30 + SK_Scalar1 / 4;
SkScalar y = SK_Scalar1 * kCellSize * (counter / lineNum) + 30 + 3 * SK_Scalar1 / 4;
canvas->translate(x, y);
}
static void SetColorAndAlpha(SkPaint* paint, SkRandom* rand) {
SkColor color = rand->nextU();
color |= 0xff000000;
paint->setColor(color);
if (40 == paint->getStrokeWidth()) {
paint->setAlpha(0xA0);
}
}
void onDraw(SkCanvas* canvas) SK_OVERRIDE {
// Stroke widths are:
// 0(may use hairline rendering), 10(common case for stroke-style)
// 40(>= geometry width/height, make the contour filled in fact)
static const int kStrokeWidths[] = {0, 10, 40};
SkASSERT(kNumStrokeWidths == SK_ARRAY_COUNT(kStrokeWidths));
static const SkPaint::Join kJoins[] = {
SkPaint::kMiter_Join, SkPaint::kRound_Join, SkPaint::kBevel_Join
};
SkASSERT(kNumJoins == SK_ARRAY_COUNT(kJoins));
int counter = 0;
SkPaint paint;
paint.setAntiAlias(true);
SkRandom rand;
// For stroke style painter
paint.setStyle(SkPaint::kStroke_Style);
for (int join = 0; join < kNumJoins; ++join) {
for (int width = 0; width < kNumStrokeWidths; ++width) {
for (int i = 0; i < fPolygons.count(); ++i) {
canvas->save();
SetLocation(canvas, counter, fPolygons.count());
SetColorAndAlpha(&paint, &rand);
paint.setStrokeJoin(kJoins[join]);
paint.setStrokeWidth(SkIntToScalar(kStrokeWidths[width]));
canvas->drawPath(fPolygons[i], paint);
canvas->restore();
++counter;
}
}
}
// For stroke-and-fill style painter and fill style painter
static const SkPaint::Style kStyles[] = {
SkPaint::kStrokeAndFill_Style, SkPaint::kFill_Style
};
SkASSERT(kNumExtraStyles == SK_ARRAY_COUNT(kStyles));
paint.setStrokeJoin(SkPaint::kMiter_Join);
paint.setStrokeWidth(SkIntToScalar(20));
for (int style = 0; style < kNumExtraStyles; ++style) {
paint.setStyle(kStyles[style]);
for (int i = 0; i < fPolygons.count(); ++i) {
canvas->save();
SetLocation(canvas, counter, fPolygons.count());
SetColorAndAlpha(&paint, &rand);
canvas->drawPath(fPolygons[i], paint);
canvas->restore();
++counter;
}
}
}
private:
static const int kNumPolygons = 8;
static const int kCellSize = 100;
static const int kNumExtraStyles = 2;
static const int kNumStrokeWidths = 3;
static const int kNumJoins = 3;
SkTArray<SkPath> fPolygons;
typedef GM INHERITED;
};
//////////////////////////////////////////////////////////////////////////////
DEF_GM(return new PolygonsGM;)
}
|
