1 /*
2 * Copyright 2011 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
10 class SkJSCanvas {
11 public:
12 SkJSCanvas(SkCanvas* target);
13 ~SkJSCanvas();
14
15 void save();
16 void restore();
17
18 double lineWidth;
19 void setLineWidth(double);
20
21 void beginPath();
22 void moveTo(double x, double y);
23 void lineTo(double x, double y);
24 void closePath();
25
26 void fill();
27 void stroke();
28
29 void fillText(const char text[], double x, double y);
30
31 private:
32 SkCanvas* fTarget;
33 SkPaint fFillPaint;
34 SkPaint fStrokePaint;
35 SkPath fPath;
36 };
37
SkJSCanvas(SkCanvas * target)38 SkJSCanvas::SkJSCanvas(SkCanvas* target) : fTarget(target) {
39 fFillPaint.setAntiAlias(true);
40 fStrokePaint.setAntiAlias(true);
41 fStrokePaint.setStyle(SkPaint::kStroke_Style);
42 fStrokePaint.setStrokeWidth(SK_Scalar1);
43 }
44
~SkJSCanvas()45 SkJSCanvas::~SkJSCanvas() {}
46
save()47 void SkJSCanvas::save() { fTarget->save(); }
restore()48 void SkJSCanvas::restore() { fTarget->restore(); }
49
beginPath()50 void SkJSCanvas::beginPath() { fPath.reset(); }
moveTo(double x,double y)51 void SkJSCanvas::moveTo(double x, double y) {
52 fPath.moveTo(SkDoubleToScalar(x), SkDoubleToScalar(y));
53 }
54
lineTo(double x,double y)55 void SkJSCanvas::lineTo(double x, double y) {
56 fPath.lineTo(SkDoubleToScalar(x), SkDoubleToScalar(y));
57 }
58
closePath()59 void SkJSCanvas::closePath() { fPath.close(); }
60
fill()61 void SkJSCanvas::fill() {
62 fTarget->drawPath(fPath, fFillPaint);
63 }
64
stroke()65 void SkJSCanvas::stroke() {
66 fStrokePaint.setStrokeWidth(SkDoubleToScalar(lineWidth));
67 fTarget->drawPath(fPath, fStrokePaint);
68 }
69
fillText(const char text[],double x,double y)70 void SkJSCanvas::fillText(const char text[], double x, double y) {
71 fTarget->drawText(text, strlen(text),
72 SkDoubleToScalar(x), SkDoubleToScalar(y), fFillPaint);
73 }
74
75 ///////////////////////////////////////////////////////////////////////////////
76
dump(const SkPath & path)77 static void dump(const SkPath& path) {
78 const SkRect& r = path.getBounds();
79 SkDebugf("isEmpty %d, bounds [%g %g %g %g]\n", path.isEmpty(),
80 r.fLeft, r.fTop, r.fRight, r.fBottom);
81 }
82
test_stroke(SkCanvas * canvas)83 static void test_stroke(SkCanvas* canvas) {
84 if (true) {
85 SkPath path;
86 dump(path);
87 path.reset(); path.moveTo(0, 0);
88 dump(path);
89 path.reset(); path.moveTo(100, 100);
90 dump(path);
91 path.reset(); path.moveTo(0, 0); path.moveTo(100, 100);
92 dump(path);
93 path.reset(); path.moveTo(0, 0); path.lineTo(100, 100);
94 dump(path);
95 path.reset(); path.moveTo(0, 0); path.lineTo(100, 100); path.moveTo(200, 200);
96 dump(path);
97 }
98
99 #if 0
100 // TEST 1 - The rectangle as it's expected to look
101 var canvas = document.createElement('canvas');
102 document.body.appendChild(canvas);
103 var ctx = canvas.getContext("2d");
104 #else
105 SkJSCanvas ctx(canvas);
106 #endif
107
108 ctx.save();
109 ctx.lineWidth = 2;
110 ctx.beginPath();
111 ctx.moveTo(10, 100);
112 ctx.lineTo(150, 100);
113 ctx.lineTo(150, 15);
114 ctx.lineTo(10, 15);
115 ctx.closePath();
116
117 // no extra moveTo here
118 // ctx.moveTo(175, 125);
119
120 ctx.stroke();
121 ctx.restore();
122
123 ctx.fillText("As Expected", 10, 10);
124
125 #if 0
126 // TEST 2 - Includes an extra moveTo call before stroke; the rectangle appears larger
127 canvas = document.createElement('canvas');
128 document.body.appendChild(canvas);
129 ctx = canvas.getContext("2d");
130 #else
131 canvas->translate(200, 0);
132 #endif
133
134 ctx.save();
135 ctx.lineWidth = 2;
136 ctx.beginPath();
137 ctx.moveTo(10, 100);
138 ctx.lineTo(150, 100);
139 ctx.lineTo(150, 15);
140 ctx.lineTo(10, 15);
141 ctx.closePath();
142
143 ctx.moveTo(175, 125);
144
145 ctx.stroke();
146 ctx.restore();
147
148 ctx.fillText("Larger Rectangle", 10, 10);
149
150 #if 0
151 // TEST 3 - Identical to test 2 except the line width is 1
152 canvas = document.createElement('canvas');
153 document.body.appendChild(canvas);
154 ctx = canvas.getContext("2d");
155 #else
156 canvas->translate(200, 0);
157 #endif
158
159 ctx.save();
160 ctx.lineWidth = 1;
161 ctx.beginPath();
162 ctx.moveTo(10, 100);
163 ctx.lineTo(150, 100);
164 ctx.lineTo(150, 15);
165 ctx.lineTo(10, 15);
166 ctx.closePath();
167
168 ctx.moveTo(175, 125);
169
170 ctx.stroke();
171 ctx.restore();
172
173 ctx.fillText("As Expected - line width 1", 10, 10);
174 }
175
176 class Poly2PolyGM : public skiagm::GM {
177 public:
Poly2PolyGM()178 Poly2PolyGM() {}
179
180 protected:
onShortName()181 virtual SkString onShortName() SK_OVERRIDE {
182 return SkString("poly2poly");
183 }
184
onISize()185 virtual SkISize onISize() SK_OVERRIDE {
186 return SkISize::Make(835, 840);
187 }
188
doDraw(SkCanvas * canvas,SkPaint * paint,const int isrc[],const int idst[],int count)189 static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
190 const int idst[], int count) {
191 SkMatrix matrix;
192 SkPoint src[4], dst[4];
193
194 for (int i = 0; i < count; i++) {
195 src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
196 dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
197 }
198
199 canvas->save();
200 matrix.setPolyToPoly(src, dst, count);
201 canvas->concat(matrix);
202
203 paint->setColor(SK_ColorGRAY);
204 paint->setStyle(SkPaint::kStroke_Style);
205 const SkScalar D = SkIntToScalar(64);
206 canvas->drawRectCoords(0, 0, D, D, *paint);
207 canvas->drawLine(0, 0, D, D, *paint);
208 canvas->drawLine(0, D, D, 0, *paint);
209
210 SkPaint::FontMetrics fm;
211 paint->getFontMetrics(&fm);
212 paint->setColor(SK_ColorRED);
213 paint->setStyle(SkPaint::kFill_Style);
214 SkScalar x = D/2;
215 SkScalar y = D/2 - (fm.fAscent + fm.fDescent)/2;
216 SkString str;
217 str.appendS32(count);
218 canvas->drawText(str.c_str(), str.size(), x, y, *paint);
219
220 canvas->restore();
221 }
222
onDraw(SkCanvas * canvas)223 virtual void onDraw(SkCanvas* canvas) SK_OVERRIDE {
224 if (false) { test_stroke(canvas); return; }
225
226 SkPaint paint;
227 paint.setAntiAlias(true);
228 paint.setStrokeWidth(SkIntToScalar(4));
229 paint.setTextSize(SkIntToScalar(40));
230 paint.setTextAlign(SkPaint::kCenter_Align);
231
232 canvas->save();
233 canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
234 // translate (1 point)
235 const int src1[] = { 0, 0 };
236 const int dst1[] = { 5, 5 };
237 doDraw(canvas, &paint, src1, dst1, 1);
238 canvas->restore();
239
240 canvas->save();
241 canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
242 // rotate/uniform-scale (2 points)
243 const int src2[] = { 32, 32, 64, 32 };
244 const int dst2[] = { 32, 32, 64, 48 };
245 doDraw(canvas, &paint, src2, dst2, 2);
246 canvas->restore();
247
248 canvas->save();
249 canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
250 // rotate/skew (3 points)
251 const int src3[] = { 0, 0, 64, 0, 0, 64 };
252 const int dst3[] = { 0, 0, 96, 0, 24, 64 };
253 doDraw(canvas, &paint, src3, dst3, 3);
254 canvas->restore();
255
256 canvas->save();
257 canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
258 // perspective (4 points)
259 const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
260 const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
261 doDraw(canvas, &paint, src4, dst4, 4);
262 canvas->restore();
263 }
264
265 private:
266 typedef skiagm::GM INHERITED;
267 };
268
269 //////////////////////////////////////////////////////////////////////////////
270
271 DEF_GM( return new Poly2PolyGM; )
272