1
2 /*
3 * Copyright 2011 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8 #include "SampleCode.h"
9 #include "SkView.h"
10 #include "SkCanvas.h"
11 #include "SkConcaveToTriangles.h"
12
13 #define SIZE SkIntToScalar(150)
14
15 typedef void (*PathProc)(SkPath*);
16
make_path0(SkPath * path)17 static void make_path0(SkPath* path) {
18 SkRect r;
19 r.set(0, 0, SIZE, SIZE);
20 path->addRect(r);
21 }
22
make_path1(SkPath * path)23 static void make_path1(SkPath* path) {
24 SkRect r;
25 r.set(0, 0, SIZE, SIZE);
26 path->addRoundRect(r, SIZE/4, SIZE/4);
27 }
28
make_path2(SkPath * path)29 static void make_path2(SkPath* path) {
30 SkRect r;
31 r.set(0, 0, SIZE, SIZE);
32 path->addOval(r);
33 }
34
35 static const PathProc gProcs[] = {
36 make_path0,
37 make_path1,
38 make_path2,
39 };
40
41 #define COUNT_PROCS SK_ARRAY_COUNT(gProcs)
42
43 class TriangleView : public SkView {
44 public:
45 SkPath fPaths[COUNT_PROCS];
46
TriangleView()47 TriangleView() {
48 for (size_t i = 0; i < COUNT_PROCS; i++) {
49 gProcs[i](&fPaths[i]);
50 }
51 }
52
53 protected:
54 // overrides from SkEventSink
onQuery(SkEvent * evt)55 virtual bool onQuery(SkEvent* evt) {
56 if (SampleCode::TitleQ(*evt)) {
57 SampleCode::TitleR(evt, "Triangles");
58 return true;
59 }
60 return this->INHERITED::onQuery(evt);
61 }
62
drawBG(SkCanvas * canvas)63 void drawBG(SkCanvas* canvas) {
64 canvas->drawColor(SK_ColorGRAY);
65 }
66
draw_path(SkCanvas * canvas,const SkPaint & pathPaint,const SkPath & path,const SkPaint & triPaint)67 static void draw_path(SkCanvas* canvas, const SkPaint& pathPaint,
68 const SkPath& path, const SkPaint& triPaint) {
69 canvas->drawPath(path, pathPaint);
70
71 int n = path.getPoints(NULL, 0);
72 SkPoint* pts = new SkPoint[n];
73 path.getPoints(pts, n);
74
75 SkTDArray<SkPoint> triangles;
76 if (SkConcaveToTriangles(n, pts, &triangles)) {
77 canvas->drawVertices(SkCanvas::kTriangles_VertexMode,
78 triangles.count(), triangles.begin(), NULL,
79 NULL, NULL, NULL, 0, triPaint);
80 }
81
82 SkPaint paint;
83 paint.setColor(SK_ColorGREEN);
84 paint.setStrokeWidth(SkIntToScalar(4));
85 canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts, paint);
86 delete[] pts;
87 }
88
onDraw(SkCanvas * canvas)89 virtual void onDraw(SkCanvas* canvas) {
90 this->drawBG(canvas);
91
92 canvas->translate(SIZE/2, SIZE/2);
93
94 SkPaint pathPaint, triPaint;
95
96 pathPaint.setColor(SK_ColorBLUE);
97 pathPaint.setStrokeWidth(SIZE / 12);
98
99 triPaint.setColor(SK_ColorRED);
100 triPaint.setStyle(SkPaint::kStroke_Style);
101
102 for (size_t i = 0; i < COUNT_PROCS; i++) {
103 pathPaint.setStyle(SkPaint::kFill_Style);
104 draw_path(canvas, pathPaint, fPaths[i], triPaint);
105
106 canvas->save();
107 canvas->translate(0, SIZE * 6 / 5);
108
109 pathPaint.setStyle(SkPaint::kStroke_Style);
110 draw_path(canvas, pathPaint, fPaths[i], triPaint);
111
112 canvas->restore();
113 canvas->translate(SIZE * 6 / 5, 0);
114 }
115 }
116
117 private:
118 typedef SkView INHERITED;
119 };
120
121 //////////////////////////////////////////////////////////////////////////////
122
MyFactory()123 static SkView* MyFactory() { return new TriangleView; }
124 static SkViewRegister reg(MyFactory);
125
126