1 /*
2 * Copyright 2016 Google Inc.
3 *
4 * Use of this source code is governed by a BD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #include "gm.h"
9 #include "SkParsePath.h"
10 #include "SkPath.h"
11
12 /*
13 The arcto test below should draw the same as this SVG:
14 (Note that Skia's arcTo Direction parameter value is opposite SVG's sweep value, e.g. 0 / 1)
15
16 <svg width="500" height="600">
17 <path d="M 50,100 A50,50, 0,0,1, 150,200" style="stroke:#660000; fill:none; stroke-width:2" />
18 <path d="M100,100 A50,100, 0,0,1, 200,200" style="stroke:#660000; fill:none; stroke-width:2" />
19 <path d="M150,100 A50,50, 45,0,1, 250,200" style="stroke:#660000; fill:none; stroke-width:2" />
20 <path d="M200,100 A50,100, 45,0,1, 300,200" style="stroke:#660000; fill:none; stroke-width:2" />
21
22 <path d="M150,200 A50,50, 0,1,0, 150,300" style="stroke:#660000; fill:none; stroke-width:2" />
23 <path d="M200,200 A50,100, 0,1,0, 200,300" style="stroke:#660000; fill:none; stroke-width:2" />
24 <path d="M250,200 A50,50, 45,1,0, 250,300" style="stroke:#660000; fill:none; stroke-width:2" />
25 <path d="M300,200 A50,100, 45,1,0, 300,300" style="stroke:#660000; fill:none; stroke-width:2" />
26
27 <path d="M250,400 A120,80 0 0,0 250,500"
28 fill="none" stroke="red" stroke-width="5" />
29
30 <path d="M250,400 A120,80 0 1,1 250,500"
31 fill="none" stroke="green" stroke-width="5"/>
32
33 <path d="M250,400 A120,80 0 1,0 250,500"
34 fill="none" stroke="purple" stroke-width="5"/>
35
36 <path d="M250,400 A120,80 0 0,1 250,500"
37 fill="none" stroke="blue" stroke-width="5"/>
38
39 <path d="M100,100 A 0, 0 0 0,1 200,200"
40 fill="none" stroke="blue" stroke-width="5" stroke-linecap="round"/>
41
42 <path d="M200,100 A 80,80 0 0,1 200,100"
43 fill="none" stroke="blue" stroke-width="5" stroke-linecap="round"/>
44 </svg>
45 */
46
47 DEF_SIMPLE_GM(arcto, canvas, 500, 600) {
48 SkPaint paint;
49 paint.setAntiAlias(true);
50 paint.setStyle(SkPaint::kStroke_Style);
51 paint.setStrokeWidth(2);
52 paint.setColor(0xFF660000);
53 // canvas->scale(2, 2); // for testing on retina
54 SkRect oval = SkRect::MakeXYWH(100, 100, 100, 100);
55 SkPath svgArc;
56
57 for (int angle = 0; angle <= 45; angle += 45) {
58 for (int oHeight = 2; oHeight >= 1; --oHeight) {
59 SkScalar ovalHeight = oval.height() / oHeight;
60 svgArc.moveTo(oval.fLeft, oval.fTop);
61 svgArc.arcTo(oval.width() / 2, ovalHeight, SkIntToScalar(angle), SkPath::kSmall_ArcSize,
62 SkPath::kCW_Direction, oval.right(), oval.bottom());
63 canvas->drawPath(svgArc, paint);
64 svgArc.reset();
65
66 svgArc.moveTo(oval.fLeft + 100, oval.fTop + 100);
67 svgArc.arcTo(oval.width() / 2, ovalHeight, SkIntToScalar(angle), SkPath::kLarge_ArcSize,
68 SkPath::kCCW_Direction, oval.right(), oval.bottom() + 100);
69 canvas->drawPath(svgArc, paint);
70 oval.offset(50, 0);
71 svgArc.reset();
72
73 }
74 }
75
76 paint.setStrokeWidth(5);
77 const SkColor purple = 0xFF800080;
78 const SkColor darkgreen = 0xFF008000;
79 const SkColor colors[] = { SK_ColorRED, darkgreen, purple, SK_ColorBLUE };
80 const char* arcstrs[] = {
81 "M250,400 A120,80 0 0,0 250,500",
82 "M250,400 A120,80 0 1,1 250,500",
83 "M250,400 A120,80 0 1,0 250,500",
84 "M250,400 A120,80 0 0,1 250,500"
85 };
86 int cIndex = 0;
87 for (const char* arcstr : arcstrs) {
88 SkParsePath::FromSVGString(arcstr, &svgArc);
89 paint.setColor(colors[cIndex++]);
90 canvas->drawPath(svgArc, paint);
91 }
92
93 // test that zero length arcs still draw round cap
94 paint.setStrokeCap(SkPaint::kRound_Cap);
95 SkPath path;
96 path.moveTo(100, 100);
97 path.arcTo(0, 0, 0, SkPath::kLarge_ArcSize, SkPath::kCW_Direction, 200, 200);
98 canvas->drawPath(path, paint);
99
100 path.reset();
101 path.moveTo(200, 100);
102 path.arcTo(80, 80, 0, SkPath::kLarge_ArcSize, SkPath::kCW_Direction, 200, 100);
103 canvas->drawPath(path, paint);
104 }
105
106 #include "random_parse_path.h"
107 #include "SkRandom.h"
108
109 /* The test below generates a reference image using SVG. To compare the result for correctness,
110 enable the define below and then view the generated SVG in a browser.
111 */
112 #define GENERATE_SVG_REFERENCE 0
113
114 #if GENERATE_SVG_REFERENCE
115 #include "SkOSFile.h"
116 #endif
117
118 enum {
119 kParsePathTestDimension = 500
120 };
121
DEF_SIMPLE_GM(parsedpaths,canvas,kParsePathTestDimension,kParsePathTestDimension)122 DEF_SIMPLE_GM(parsedpaths, canvas, kParsePathTestDimension, kParsePathTestDimension) {
123 #if GENERATE_SVG_REFERENCE
124 FILE* file = sk_fopen("svgout.htm", kWrite_SkFILE_Flag);
125 SkString str;
126 str.printf("<svg width=\"%d\" height=\"%d\">\n", kParsePathTestDimension,
127 kParsePathTestDimension);
128 sk_fwrite(str.c_str(), str.size(), file);
129 #endif
130 SkRandom rand;
131 SkPaint paint;
132 paint.setAntiAlias(true);
133 for (int xStart = 0; xStart < kParsePathTestDimension; xStart += 100) {
134 canvas->save();
135 for (int yStart = 0; yStart < kParsePathTestDimension; yStart += 100) {
136 #if GENERATE_SVG_REFERENCE
137 str.printf("<g transform='translate(%d,%d) scale(%d,%d)'>\n", xStart, yStart,
138 1, 1);
139 sk_fwrite(str.c_str(), str.size(), file);
140 str.printf("<clipPath id='clip_%d_%d'>\n", xStart, yStart);
141 sk_fwrite(str.c_str(), str.size(), file);
142 str.printf("<rect width='100' height='100' x='0' y='0'></rect>\n");
143 sk_fwrite(str.c_str(), str.size(), file);
144 str.printf("</clipPath>\n");
145 sk_fwrite(str.c_str(), str.size(), file);
146 #endif
147 int count = 3;
148 do {
149 SkPath path;
150 SkString spec;
151 uint32_t y = rand.nextRangeU(30, 70);
152 uint32_t x = rand.nextRangeU(30, 70);
153 spec.printf("M %d,%d\n", x, y);
154 uint32_t count = rand.nextRangeU(0, 10);
155 for (uint32_t i = 0; i < count; ++i) {
156 spec.append(MakeRandomParsePathPiece(&rand));
157 }
158 SkAssertResult(SkParsePath::FromSVGString(spec.c_str(), &path));
159 paint.setColor(rand.nextU());
160 canvas->save();
161 canvas->clipRect(SkRect::MakeIWH(100, 100));
162 canvas->drawPath(path, paint);
163 canvas->restore();
164 #if GENERATE_SVG_REFERENCE
165 str.printf("<path d='\n");
166 sk_fwrite(str.c_str(), str.size(), file);
167 sk_fwrite(spec.c_str(), spec.size(), file);
168 str.printf("\n' fill='#%06x' fill-opacity='%g'", paint.getColor() & 0xFFFFFF,
169 paint.getAlpha() / 255.f);
170 sk_fwrite(str.c_str(), str.size(), file);
171 str.printf(" clip-path='url(#clip_%d_%d)'/>\n", xStart, yStart);
172 sk_fwrite(str.c_str(), str.size(), file);
173 #endif
174 } while (--count > 0);
175 #if GENERATE_SVG_REFERENCE
176 str.printf("</g>\n");
177 sk_fwrite(str.c_str(), str.size(), file);
178 #endif
179 canvas->translate(0, 100);
180 }
181 canvas->restore();
182 canvas->translate(100, 0);
183 }
184 #if GENERATE_SVG_REFERENCE
185 const char trailer[] = "</svg>\n";
186 sk_fwrite(trailer, sizeof(trailer) - 1, file);
187 sk_fclose(file);
188 #endif
189 }
190
191 DEF_SIMPLE_GM(bug593049, canvas, 300, 300) {
192 canvas->translate(111, 0);
193
194 SkPath p;
195 p.moveTo(-43.44464063610148f, 79.43535936389853f);
196 const SkScalar yOffset = 122.88f;
197 const SkScalar radius = 61.44f;
198 SkRect oval = SkRect::MakeXYWH(-radius, yOffset - radius, 2 * radius, 2 * radius);
199 p.arcTo(oval, 1.25f * 180, .5f * 180, false);
200
201 SkPaint paint;
202 paint.setStyle(SkPaint::kStroke_Style);
203 paint.setStrokeCap(SkPaint::kRound_Cap);
204 paint.setStrokeWidth(15.36f);
205
206 canvas->drawPath(p, paint);
207 }
208
209 #include "SkDashPathEffect.h"
210 #include "SkPathMeasure.h"
211
212 DEF_SIMPLE_GM(bug583299, canvas, 300, 300) {
213 const char* d="M60,60 A50,50 0 0 0 160,60 A50,50 0 0 0 60,60z";
214 SkPaint p;
215 p.setStyle(SkPaint::kStroke_Style);
216 p.setStrokeWidth(100);
217 p.setAntiAlias(true);
218 p.setColor(0xFF008200);
219 p.setStrokeCap(SkPaint::kSquare_Cap);
220 SkPath path;
221 SkParsePath::FromSVGString(d, &path);
222 SkPathMeasure meas(path, false);
223 SkScalar length = meas.getLength();
224 SkScalar intervals[] = {0, length };
225 int intervalCount = (int) SK_ARRAY_COUNT(intervals);
226 p.setPathEffect(SkDashPathEffect::Make(intervals, intervalCount, 0));
227 canvas->drawPath(path, p);
228 }
229