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 sk_tool_utils::set_portable_typeface(&fFillPaint);
41 fStrokePaint.setAntiAlias(true);
42 fStrokePaint.setStyle(SkPaint::kStroke_Style);
43 fStrokePaint.setStrokeWidth(SK_Scalar1);
44 }
45
~SkJSCanvas()46 SkJSCanvas::~SkJSCanvas() {}
47
save()48 void SkJSCanvas::save() { fTarget->save(); }
restore()49 void SkJSCanvas::restore() { fTarget->restore(); }
50
beginPath()51 void SkJSCanvas::beginPath() { fPath.reset(); }
moveTo(double x,double y)52 void SkJSCanvas::moveTo(double x, double y) {
53 fPath.moveTo(SkDoubleToScalar(x), SkDoubleToScalar(y));
54 }
55
lineTo(double x,double y)56 void SkJSCanvas::lineTo(double x, double y) {
57 fPath.lineTo(SkDoubleToScalar(x), SkDoubleToScalar(y));
58 }
59
closePath()60 void SkJSCanvas::closePath() { fPath.close(); }
61
fill()62 void SkJSCanvas::fill() {
63 fTarget->drawPath(fPath, fFillPaint);
64 }
65
stroke()66 void SkJSCanvas::stroke() {
67 fStrokePaint.setStrokeWidth(SkDoubleToScalar(lineWidth));
68 fTarget->drawPath(fPath, fStrokePaint);
69 }
70
fillText(const char text[],double x,double y)71 void SkJSCanvas::fillText(const char text[], double x, double y) {
72 fTarget->drawText(text, strlen(text),
73 SkDoubleToScalar(x), SkDoubleToScalar(y), fFillPaint);
74 }
75
76 ///////////////////////////////////////////////////////////////////////////////
77
dump(const SkPath & path)78 static void dump(const SkPath& path) {
79 const SkRect& r = path.getBounds();
80 SkDebugf("isEmpty %d, bounds [%g %g %g %g]\n", path.isEmpty(),
81 r.fLeft, r.fTop, r.fRight, r.fBottom);
82 }
83
test_stroke(SkCanvas * canvas)84 static void test_stroke(SkCanvas* canvas) {
85 if (true) {
86 SkPath path;
87 dump(path);
88 path.reset(); path.moveTo(0, 0);
89 dump(path);
90 path.reset(); path.moveTo(100, 100);
91 dump(path);
92 path.reset(); path.moveTo(0, 0); path.moveTo(100, 100);
93 dump(path);
94 path.reset(); path.moveTo(0, 0); path.lineTo(100, 100);
95 dump(path);
96 path.reset(); path.moveTo(0, 0); path.lineTo(100, 100); path.moveTo(200, 200);
97 dump(path);
98 }
99
100 #if 0
101 // TEST 1 - The rectangle as it's expected to look
102 var canvas = document.createElement('canvas');
103 document.body.appendChild(canvas);
104 var ctx = canvas.getContext("2d");
105 #else
106 SkJSCanvas ctx(canvas);
107 #endif
108
109 ctx.save();
110 ctx.lineWidth = 2;
111 ctx.beginPath();
112 ctx.moveTo(10, 100);
113 ctx.lineTo(150, 100);
114 ctx.lineTo(150, 15);
115 ctx.lineTo(10, 15);
116 ctx.closePath();
117
118 // no extra moveTo here
119 // ctx.moveTo(175, 125);
120
121 ctx.stroke();
122 ctx.restore();
123
124 ctx.fillText("As Expected", 10, 10);
125
126 #if 0
127 // TEST 2 - Includes an extra moveTo call before stroke; the rectangle appears larger
128 canvas = document.createElement('canvas');
129 document.body.appendChild(canvas);
130 ctx = canvas.getContext("2d");
131 #else
132 canvas->translate(200, 0);
133 #endif
134
135 ctx.save();
136 ctx.lineWidth = 2;
137 ctx.beginPath();
138 ctx.moveTo(10, 100);
139 ctx.lineTo(150, 100);
140 ctx.lineTo(150, 15);
141 ctx.lineTo(10, 15);
142 ctx.closePath();
143
144 ctx.moveTo(175, 125);
145
146 ctx.stroke();
147 ctx.restore();
148
149 ctx.fillText("Larger Rectangle", 10, 10);
150
151 #if 0
152 // TEST 3 - Identical to test 2 except the line width is 1
153 canvas = document.createElement('canvas');
154 document.body.appendChild(canvas);
155 ctx = canvas.getContext("2d");
156 #else
157 canvas->translate(200, 0);
158 #endif
159
160 ctx.save();
161 ctx.lineWidth = 1;
162 ctx.beginPath();
163 ctx.moveTo(10, 100);
164 ctx.lineTo(150, 100);
165 ctx.lineTo(150, 15);
166 ctx.lineTo(10, 15);
167 ctx.closePath();
168
169 ctx.moveTo(175, 125);
170
171 ctx.stroke();
172 ctx.restore();
173
174 ctx.fillText("As Expected - line width 1", 10, 10);
175 }
176
177 class Poly2PolyGM : public skiagm::GM {
178 public:
Poly2PolyGM()179 Poly2PolyGM() {}
180
181 protected:
182
onShortName()183 SkString onShortName() override {
184 return SkString("poly2poly");
185 }
186
onISize()187 SkISize onISize() override {
188 return SkISize::Make(835, 840);
189 }
190
doDraw(SkCanvas * canvas,SkPaint * paint,const int isrc[],const int idst[],int count)191 static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
192 const int idst[], int count) {
193 SkMatrix matrix;
194 SkPoint src[4], dst[4];
195
196 for (int i = 0; i < count; i++) {
197 src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
198 dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
199 }
200
201 canvas->save();
202 matrix.setPolyToPoly(src, dst, count);
203 canvas->concat(matrix);
204
205 paint->setColor(SK_ColorGRAY);
206 paint->setStyle(SkPaint::kStroke_Style);
207 const SkScalar D = SkIntToScalar(64);
208 canvas->drawRectCoords(0, 0, D, D, *paint);
209 canvas->drawLine(0, 0, D, D, *paint);
210 canvas->drawLine(0, D, D, 0, *paint);
211
212 SkPaint::FontMetrics fm;
213 paint->getFontMetrics(&fm);
214 paint->setColor(SK_ColorRED);
215 paint->setStyle(SkPaint::kFill_Style);
216 SkScalar x = D/2;
217 SkScalar y = D/2 - (fm.fAscent + fm.fDescent)/2;
218 SkString str;
219 str.appendS32(count);
220 canvas->drawText(str.c_str(), str.size(), x, y, *paint);
221
222 canvas->restore();
223 }
224
onDraw(SkCanvas * canvas)225 void onDraw(SkCanvas* canvas) override {
226 if (false) { test_stroke(canvas); return; }
227
228 SkPaint paint;
229 paint.setAntiAlias(true);
230 sk_tool_utils::set_portable_typeface(&paint);
231 paint.setStrokeWidth(SkIntToScalar(4));
232 paint.setTextSize(SkIntToScalar(40));
233 paint.setTextAlign(SkPaint::kCenter_Align);
234
235 canvas->save();
236 canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
237 // translate (1 point)
238 const int src1[] = { 0, 0 };
239 const int dst1[] = { 5, 5 };
240 doDraw(canvas, &paint, src1, dst1, 1);
241 canvas->restore();
242
243 canvas->save();
244 canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
245 // rotate/uniform-scale (2 points)
246 const int src2[] = { 32, 32, 64, 32 };
247 const int dst2[] = { 32, 32, 64, 48 };
248 doDraw(canvas, &paint, src2, dst2, 2);
249 canvas->restore();
250
251 canvas->save();
252 canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
253 // rotate/skew (3 points)
254 const int src3[] = { 0, 0, 64, 0, 0, 64 };
255 const int dst3[] = { 0, 0, 96, 0, 24, 64 };
256 doDraw(canvas, &paint, src3, dst3, 3);
257 canvas->restore();
258
259 canvas->save();
260 canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
261 // perspective (4 points)
262 const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
263 const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
264 doDraw(canvas, &paint, src4, dst4, 4);
265 canvas->restore();
266 }
267
268 private:
269 typedef skiagm::GM INHERITED;
270 };
271
272 //////////////////////////////////////////////////////////////////////////////
273
274 DEF_GM( return new Poly2PolyGM; )
275