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 "SkTime.h"
14
15 extern bool SkSetPoly3To3(SkMatrix* matrix, const SkPoint src[3], const SkPoint dst[3]);
16
17 class PolyToPolyView : public SampleView {
18 public:
PolyToPolyView()19 PolyToPolyView() {
20 // tests
21 {
22 SkPoint src[] = { { 0, 0 },
23 { SK_Scalar1, 0 },
24 { 0, SK_Scalar1 } };
25 SkPoint dst[] = { { 0, 0 },
26 { 2*SK_Scalar1, 0 },
27 { 0, 2*SK_Scalar1 } };
28 SkMatrix m1, m2;
29
30 (void) m1.setPolyToPoly(src, dst, 3);
31
32 m2.reset();
33 m2.set(SkMatrix::kMScaleX, dst[1].fX - dst[0].fX);
34 m2.set(SkMatrix::kMSkewX, dst[2].fX - dst[0].fX);
35 m2.set(SkMatrix::kMTransX, dst[0].fX);
36 m2.set(SkMatrix::kMSkewY, dst[1].fY - dst[0].fY);
37 m2.set(SkMatrix::kMScaleY, dst[2].fY - dst[0].fY);
38 m2.set(SkMatrix::kMTransY, dst[0].fY);
39
40 m1.reset();
41
42 const SkScalar src1[] = {
43 0, 0, 0, 427, 316, 427, 316, 0
44 };
45 const SkScalar dst1[] = {
46 158, 177.5f, 158, 249.5f,
47 158, 604.5f, 158, -177.5f
48 };
49
50 (void) m2.setPolyToPoly((const SkPoint*)src1, (SkPoint*)dst1, 4);
51
52 {
53 const SkPoint src[] = {
54 { SkIntToScalar(1), SkIntToScalar(0) },
55 { SkIntToScalar(4), SkIntToScalar(7) },
56 { SkIntToScalar(10), SkIntToScalar(2) }
57 };
58 const SkPoint dst[] = {
59 { SkIntToScalar(4), SkIntToScalar(2) },
60 { SkIntToScalar(45), SkIntToScalar(26) },
61 { SkIntToScalar(32), SkIntToScalar(17) }
62 };
63
64 SkMatrix m0;
65 m0.setPolyToPoly(src, dst, 3);
66 // SkMatrix m1;
67 // SkSetPoly3To3(&m1, src, dst);
68 // m0.dump();
69 // m1.dump();
70 }
71 }
72 }
73
74 protected:
75 // overrides from SkEventSink
onQuery(SkEvent * evt)76 virtual bool onQuery(SkEvent* evt) {
77 if (SampleCode::TitleQ(*evt)) {
78 SampleCode::TitleR(evt, "PolyToPolyView");
79 return true;
80 }
81 return this->INHERITED::onQuery(evt);
82 }
83
doDraw(SkCanvas * canvas,SkPaint * paint,const int isrc[],const int idst[],int count)84 static void doDraw(SkCanvas* canvas, SkPaint* paint, const int isrc[],
85 const int idst[], int count) {
86 SkMatrix matrix;
87 SkPoint src[4], dst[4];
88
89 for (int i = 0; i < count; i++) {
90 src[i].set(SkIntToScalar(isrc[2*i+0]), SkIntToScalar(isrc[2*i+1]));
91 dst[i].set(SkIntToScalar(idst[2*i+0]), SkIntToScalar(idst[2*i+1]));
92 }
93
94 canvas->save();
95 matrix.setPolyToPoly(src, dst, count);
96 canvas->concat(matrix);
97
98 paint->setColor(SK_ColorGRAY);
99 paint->setStyle(SkPaint::kStroke_Style);
100 const SkScalar D = SkIntToScalar(64);
101 canvas->drawRect(SkRect::MakeWH(D, D), *paint);
102 canvas->drawLine(0, 0, D, D, *paint);
103 canvas->drawLine(0, D, D, 0, *paint);
104
105 SkPaint::FontMetrics fm;
106 paint->getFontMetrics(&fm);
107 paint->setColor(SK_ColorRED);
108 paint->setStyle(SkPaint::kFill_Style);
109 SkScalar x = D/2;
110 float y = D/2 - (fm.fAscent + fm.fDescent)/2;
111 SkString str;
112 str.appendS32(count);
113 canvas->drawText(str.c_str(), str.size(),
114 x, y,
115 *paint);
116
117 canvas->restore();
118 }
119
onDrawContent(SkCanvas * canvas)120 virtual void onDrawContent(SkCanvas* canvas) {
121 SkPaint paint;
122 paint.setAntiAlias(true);
123 paint.setStrokeWidth(SkIntToScalar(4));
124 paint.setTextSize(SkIntToScalar(40));
125 paint.setTextAlign(SkPaint::kCenter_Align);
126
127 canvas->save();
128 canvas->translate(SkIntToScalar(10), SkIntToScalar(10));
129 // translate (1 point)
130 const int src1[] = { 0, 0 };
131 const int dst1[] = { 5, 5 };
132 doDraw(canvas, &paint, src1, dst1, 1);
133 canvas->restore();
134
135 canvas->save();
136 canvas->translate(SkIntToScalar(160), SkIntToScalar(10));
137 // rotate/uniform-scale (2 points)
138 const int src2[] = { 32, 32, 64, 32 };
139 const int dst2[] = { 32, 32, 64, 48 };
140 doDraw(canvas, &paint, src2, dst2, 2);
141 canvas->restore();
142
143 canvas->save();
144 canvas->translate(SkIntToScalar(10), SkIntToScalar(110));
145 // rotate/skew (3 points)
146 const int src3[] = { 0, 0, 64, 0, 0, 64 };
147 const int dst3[] = { 0, 0, 96, 0, 24, 64 };
148 doDraw(canvas, &paint, src3, dst3, 3);
149 canvas->restore();
150
151 canvas->save();
152 canvas->translate(SkIntToScalar(160), SkIntToScalar(110));
153 // perspective (4 points)
154 const int src4[] = { 0, 0, 64, 0, 64, 64, 0, 64 };
155 const int dst4[] = { 0, 0, 96, 0, 64, 96, 0, 64 };
156 doDraw(canvas, &paint, src4, dst4, 4);
157 canvas->restore();
158 }
159
160 private:
161 typedef SampleView INHERITED;
162 };
163
164 //////////////////////////////////////////////////////////////////////////////
165
MyFactory()166 static SkView* MyFactory() { return new PolyToPolyView; }
167 static SkViewRegister reg(MyFactory);
168