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 #include "SampleCode.h"
8 #include "SkView.h"
9 #include "SkCanvas.h"
10 #include "SkGraphics.h"
11 #include "SkPath.h"
12 #include "SkRandom.h"
13 #include "SkString.h"
14 #include "SkTime.h"
15
16 class PolyToPolyView : public SampleView {
17 public:
PolyToPolyView()18 PolyToPolyView() {
19 // tests
20 {
21 SkPoint src[] = { { 0, 0 },
22 { SK_Scalar1, 0 },
23 { 0, SK_Scalar1 } };
24 SkPoint dst[] = { { 0, 0 },
25 { 2*SK_Scalar1, 0 },
26 { 0, 2*SK_Scalar1 } };
27 SkMatrix m1, m2;
28
29 (void) m1.setPolyToPoly(src, dst, 3);
30
31 m2.reset();
32 m2.set(SkMatrix::kMScaleX, dst[1].fX - dst[0].fX);
33 m2.set(SkMatrix::kMSkewX, dst[2].fX - dst[0].fX);
34 m2.set(SkMatrix::kMTransX, dst[0].fX);
35 m2.set(SkMatrix::kMSkewY, dst[1].fY - dst[0].fY);
36 m2.set(SkMatrix::kMScaleY, dst[2].fY - dst[0].fY);
37 m2.set(SkMatrix::kMTransY, dst[0].fY);
38
39 m1.reset();
40
41 const SkScalar src1[] = {
42 0, 0, 0, 427, 316, 427, 316, 0
43 };
44 const SkScalar dst1[] = {
45 158, 177.5f, 158, 249.5f,
46 158, 604.5f, 158, -177.5f
47 };
48
49 (void) m2.setPolyToPoly((const SkPoint*)src1, (SkPoint*)dst1, 4);
50
51 {
52 const SkPoint src[] = {
53 { SkIntToScalar(1), SkIntToScalar(0) },
54 { SkIntToScalar(4), SkIntToScalar(7) },
55 { SkIntToScalar(10), SkIntToScalar(2) }
56 };
57 const SkPoint dst[] = {
58 { SkIntToScalar(4), SkIntToScalar(2) },
59 { SkIntToScalar(45), SkIntToScalar(26) },
60 { SkIntToScalar(32), SkIntToScalar(17) }
61 };
62
63 SkMatrix m0;
64 m0.setPolyToPoly(src, dst, 3);
65 }
66 }
67 }
68
69 protected:
70 // overrides from SkEventSink
onQuery(SkEvent * evt)71 virtual bool onQuery(SkEvent* evt) {
72 if (SampleCode::TitleQ(*evt)) {
73 SampleCode::TitleR(evt, "PolyToPolyView");
74 return true;
75 }
76 return this->INHERITED::onQuery(evt);
77 }
78
doDraw(SkCanvas * canvas,SkPaint * paint,const int isrc[],const int idst[],int count)79 static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
80 const int idst[], int count) {
81 SkMatrix matrix;
82 SkPoint src[4], dst[4];
83
84 for (int i = 0; i < count; i++) {
85 src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
86 dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
87 }
88
89 canvas->save();
90 matrix.setPolyToPoly(src, dst, count);
91 canvas->concat(matrix);
92
93 paint->setColor(SK_ColorGRAY);
94 paint->setStyle(SkPaint::kStroke_Style);
95 const SkScalar D = SkIntToScalar(64);
96 canvas->drawRect(SkRect::MakeWH(D, D), *paint);
97 canvas->drawLine(0, 0, D, D, *paint);
98 canvas->drawLine(0, D, D, 0, *paint);
99
100 SkPaint::FontMetrics fm;
101 paint->getFontMetrics(&fm);
102 paint->setColor(SK_ColorRED);
103 paint->setStyle(SkPaint::kFill_Style);
104 SkScalar x = D/2;
105 float y = D/2 - (fm.fAscent + fm.fDescent)/2;
106 SkString str;
107 str.appendS32(count);
108 canvas->drawString(str,
109 x, y,
110 *paint);
111
112 canvas->restore();
113 }
114
onDrawContent(SkCanvas * canvas)115 virtual void onDrawContent(SkCanvas* canvas) {
116 SkPaint paint;
117 paint.setAntiAlias(true);
118 paint.setStrokeWidth(SkIntToScalar(4));
119 paint.setTextSize(SkIntToScalar(40));
120 paint.setTextAlign(SkPaint::kCenter_Align);
121
122 canvas->save();
123 canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
124 // translate (1 point)
125 const int src1[] = { 0, 0 };
126 const int dst1[] = { 5, 5 };
127 doDraw(canvas, &paint, src1, dst1, 1);
128 canvas->restore();
129
130 canvas->save();
131 canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
132 // rotate/uniform-scale (2 points)
133 const int src2[] = { 32, 32, 64, 32 };
134 const int dst2[] = { 32, 32, 64, 48 };
135 doDraw(canvas, &paint, src2, dst2, 2);
136 canvas->restore();
137
138 canvas->save();
139 canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
140 // rotate/skew (3 points)
141 const int src3[] = { 0, 0, 64, 0, 0, 64 };
142 const int dst3[] = { 0, 0, 96, 0, 24, 64 };
143 doDraw(canvas, &paint, src3, dst3, 3);
144 canvas->restore();
145
146 canvas->save();
147 canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
148 // perspective (4 points)
149 const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
150 const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
151 doDraw(canvas, &paint, src4, dst4, 4);
152 canvas->restore();
153 }
154
155 private:
156 typedef SampleView INHERITED;
157 };
158
159 //////////////////////////////////////////////////////////////////////////////
160
MyFactory()161 static SkView* MyFactory() { return new PolyToPolyView; }
162 static SkViewRegister reg(MyFactory);
163