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 "SkGradientShader.h"
11 #include "SkGraphics.h"
12 #include "SkPath.h"
13 #include "SkRandom.h"
14 #include "SkRegion.h"
15 #include "SkShader.h"
16 #include "SkUtils.h"
17 #include "SkColorPriv.h"
18 #include "SkColorFilter.h"
19 #include "SkTime.h"
20 #include "SkTypeface.h"
21
22 #include "SkOSFile.h"
23 #include "SkStream.h"
24
make_shader0(SkIPoint * size)25 static sk_sp<SkShader> make_shader0(SkIPoint* size) {
26 SkBitmap bm;
27 size->set(2, 2);
28 SkPMColor color0 = SkPreMultiplyARGB(0x80, 0x80, 0xff, 0x80);
29 SkPMColor color1 = SkPreMultiplyARGB(0x40, 0xff, 0x00, 0xff);
30 bm.allocN32Pixels(size->fX, size->fY);
31 bm.eraseColor(color0);
32 bm.lockPixels();
33 uint32_t* pixels = (uint32_t*) bm.getPixels();
34 pixels[0] = pixels[2] = color0;
35 pixels[1] = pixels[3] = color1;
36 bm.unlockPixels();
37
38 return SkShader::MakeBitmapShader(bm, SkShader::kRepeat_TileMode, SkShader::kRepeat_TileMode);
39 }
40
make_shader1(const SkIPoint & size)41 static sk_sp<SkShader> make_shader1(const SkIPoint& size) {
42 SkPoint pts[] = { { 0, 0 },
43 { SkIntToScalar(size.fX), SkIntToScalar(size.fY) } };
44 SkColor colors[] = { SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorRED };
45 return SkGradientShader::MakeLinear(pts, colors, nullptr,
46 SK_ARRAY_COUNT(colors), SkShader::kMirror_TileMode);
47 }
48
49 class VerticesView : public SampleView {
50 sk_sp<SkShader> fShader0;
51 sk_sp<SkShader> fShader1;
52
53 public:
VerticesView()54 VerticesView() {
55 SkIPoint size;
56
57 fShader0 = make_shader0(&size);
58 fShader1 = make_shader1(size);
59
60 make_strip(&fRecs[0], size.fX, size.fY);
61 make_fan(&fRecs[1], size.fX, size.fY);
62 make_tris(&fRecs[2]);
63
64 fScale = SK_Scalar1;
65
66 this->setBGColor(SK_ColorGRAY);
67 }
68
69 protected:
70 // overrides from SkEventSink
onQuery(SkEvent * evt)71 bool onQuery(SkEvent* evt) override {
72 if (SampleCode::TitleQ(*evt)) {
73 SampleCode::TitleR(evt, "Vertices");
74 return true;
75 }
76 return this->INHERITED::onQuery(evt);
77 }
78
79 SkScalar fScale;
80
onDrawContent(SkCanvas * canvas)81 void onDrawContent(SkCanvas* canvas) override {
82 SkPaint paint;
83 paint.setDither(true);
84 paint.setFilterQuality(kLow_SkFilterQuality);
85
86 for (size_t i = 0; i < SK_ARRAY_COUNT(fRecs); i++) {
87 canvas->save();
88
89 paint.setShader(nullptr);
90 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount,
91 fRecs[i].fVerts, fRecs[i].fTexs,
92 nullptr, nullptr, 0, paint);
93
94 canvas->translate(SkIntToScalar(250), 0);
95
96 paint.setShader(fShader0);
97 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount,
98 fRecs[i].fVerts, fRecs[i].fTexs,
99 nullptr, nullptr, 0, paint);
100
101 canvas->translate(SkIntToScalar(250), 0);
102
103 paint.setShader(fShader1);
104 canvas->drawVertices(fRecs[i].fMode, fRecs[i].fCount,
105 fRecs[i].fVerts, fRecs[i].fTexs,
106 nullptr, nullptr, 0, paint);
107 canvas->restore();
108
109 canvas->translate(0, SkIntToScalar(250));
110 }
111 }
112
onFindClickHandler(SkScalar x,SkScalar y,unsigned)113 SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override {
114 return new Click(this);
115 }
116
onClick(Click * click)117 bool onClick(Click* click) override {
118 // fCurrX = click->fICurr.fX;
119 // fCurrY = click->fICurr.fY;
120 this->inval(nullptr);
121 return true;
122 }
123
124 private:
125 struct Rec {
126 SkCanvas::VertexMode fMode;
127 int fCount;
128 SkPoint* fVerts;
129 SkPoint* fTexs;
130
RecVerticesView::Rec131 Rec() : fCount(0), fVerts(nullptr), fTexs(nullptr) {}
~RecVerticesView::Rec132 ~Rec() { delete[] fVerts; delete[] fTexs; }
133 };
134
make_tris(Rec * rec)135 void make_tris(Rec* rec) {
136 int n = 10;
137 SkRandom rand;
138
139 rec->fMode = SkCanvas::kTriangles_VertexMode;
140 rec->fCount = n * 3;
141 rec->fVerts = new SkPoint[rec->fCount];
142
143 for (int i = 0; i < n; i++) {
144 SkPoint* v = &rec->fVerts[i*3];
145 for (int j = 0; j < 3; j++) {
146 v[j].set(rand.nextUScalar1() * 250, rand.nextUScalar1() * 250);
147 }
148 }
149 }
150
make_fan(Rec * rec,int texWidth,int texHeight)151 void make_fan(Rec* rec, int texWidth, int texHeight) {
152 const SkScalar tx = SkIntToScalar(texWidth);
153 const SkScalar ty = SkIntToScalar(texHeight);
154 const int n = 24;
155
156 rec->fMode = SkCanvas::kTriangleFan_VertexMode;
157 rec->fCount = n + 2;
158 rec->fVerts = new SkPoint[rec->fCount];
159 rec->fTexs = new SkPoint[rec->fCount];
160
161 SkPoint* v = rec->fVerts;
162 SkPoint* t = rec->fTexs;
163
164 v[0].set(0, 0);
165 t[0].set(0, 0);
166 for (int i = 0; i < n; i++) {
167 SkScalar cos;
168 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos);
169 v[i+1].set(cos, sin);
170 t[i+1].set(i*tx/n, ty);
171 }
172 v[n+1] = v[1];
173 t[n+1].set(tx, ty);
174
175 SkMatrix m;
176 m.setScale(SkIntToScalar(100), SkIntToScalar(100));
177 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
178 m.mapPoints(v, rec->fCount);
179 }
180
make_strip(Rec * rec,int texWidth,int texHeight)181 void make_strip(Rec* rec, int texWidth, int texHeight) {
182 const SkScalar tx = SkIntToScalar(texWidth);
183 const SkScalar ty = SkIntToScalar(texHeight);
184 const int n = 24;
185
186 rec->fMode = SkCanvas::kTriangleStrip_VertexMode;
187 rec->fCount = 2 * (n + 1);
188 rec->fVerts = new SkPoint[rec->fCount];
189 rec->fTexs = new SkPoint[rec->fCount];
190
191 SkPoint* v = rec->fVerts;
192 SkPoint* t = rec->fTexs;
193
194 for (int i = 0; i < n; i++) {
195 SkScalar cos;
196 SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos);
197 v[i*2 + 0].set(cos/2, sin/2);
198 v[i*2 + 1].set(cos, sin);
199
200 t[i*2 + 0].set(tx * i / n, ty);
201 t[i*2 + 1].set(tx * i / n, 0);
202 }
203 v[2*n + 0] = v[0];
204 v[2*n + 1] = v[1];
205
206 t[2*n + 0].set(tx, ty);
207 t[2*n + 1].set(tx, 0);
208
209 SkMatrix m;
210 m.setScale(SkIntToScalar(100), SkIntToScalar(100));
211 m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
212 m.mapPoints(v, rec->fCount);
213 }
214
215 Rec fRecs[3];
216
217 typedef SampleView INHERITED;
218 };
219
220 //////////////////////////////////////////////////////////////////////////////
221
MyFactory()222 static SkView* MyFactory() { return new VerticesView; }
223 static SkViewRegister reg(MyFactory);
224