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 "SampleCode.h" 9 #include "SkAnimTimer.h" 10 #include "SkView.h" 11 #include "SkCanvas.h" 12 #include "SkGradientShader.h" 13 #include "SkGraphics.h" 14 #include "SkPath.h" 15 #include "SkRegion.h" 16 #include "SkShader.h" 17 #include "SkUtils.h" 18 #include "SkColorPriv.h" 19 #include "SkColorFilter.h" 20 #include "SkTime.h" 21 #include "SkTypeface.h" 22 23 #include "SkOSFile.h" 24 #include "SkStream.h" 25 26 #define INT_SIZE 64 27 #define SCALAR_SIZE SkIntToScalar(INT_SIZE) 28 29 static void make_bitmap(SkBitmap* bitmap) { 30 bitmap->allocN32Pixels(INT_SIZE, INT_SIZE); 31 SkCanvas canvas(*bitmap); 32 33 canvas.drawColor(SK_ColorRED); 34 SkPaint paint; 35 paint.setAntiAlias(true); 36 const SkPoint pts[] = { { 0, 0 }, { SCALAR_SIZE, SCALAR_SIZE } }; 37 const SkColor colors[] = { SK_ColorWHITE, SK_ColorBLUE }; 38 paint.setShader(SkGradientShader::MakeLinear(pts, colors, nullptr, 2, 39 SkShader::kClamp_TileMode)); 40 canvas.drawCircle(SCALAR_SIZE/2, SCALAR_SIZE/2, SCALAR_SIZE/2, paint); 41 } 42 43 static SkPoint unit_vec(int degrees) { 44 SkScalar rad = SkDegreesToRadians(SkIntToScalar(degrees)); 45 SkScalar s, c; 46 s = SkScalarSinCos(rad, &c); 47 return SkPoint::Make(c, s); 48 } 49 50 static void bounce(SkScalar* value, SkScalar* delta, SkScalar min, SkScalar max) { 51 *value += *delta; 52 if (*value < min) { 53 *value = min; 54 *delta = - *delta; 55 } else if (*value > max) { 56 *value = max; 57 *delta = - *delta; 58 } 59 } 60 61 static void bounce_pt(SkPoint* pt, SkVector* vec, const SkRect& limit) { 62 bounce(&pt->fX, &vec->fX, limit.fLeft, limit.fRight); 63 bounce(&pt->fY, &vec->fY, limit.fTop, limit.fBottom); 64 } 65 66 class BitmapRectView : public SampleView { 67 SkPoint fSrcPts[2]; 68 SkPoint fSrcVec[2]; 69 SkRect fSrcLimit; 70 SkRect fDstR[2]; 71 72 void bounce() { 73 bounce_pt(&fSrcPts[0], &fSrcVec[0], fSrcLimit); 74 bounce_pt(&fSrcPts[1], &fSrcVec[1], fSrcLimit); 75 } 76 77 void resetBounce() { 78 fSrcPts[0].set(0, 0); 79 fSrcPts[1].set(SCALAR_SIZE, SCALAR_SIZE); 80 81 fSrcVec[0] = unit_vec(30); 82 fSrcVec[1] = unit_vec(107); 83 } 84 85 public: 86 BitmapRectView() { 87 this->setBGColor(SK_ColorGRAY); 88 89 this->resetBounce(); 90 91 fSrcLimit.set(-SCALAR_SIZE/4, -SCALAR_SIZE/4, 92 SCALAR_SIZE*5/4, SCALAR_SIZE*5/4); 93 94 fDstR[0] = SkRect::MakeXYWH(SkIntToScalar(10), SkIntToScalar(100), 95 SkIntToScalar(250), SkIntToScalar(300)); 96 fDstR[1] = fDstR[0]; 97 fDstR[1].offset(fDstR[0].width() * 5/4, 0); 98 99 fSrcPts[0].set(32, 32); 100 fSrcPts[1].set(90, 90); 101 } 102 103 protected: 104 bool onQuery(SkEvent* evt) override { 105 if (SampleCode::TitleQ(*evt)) { 106 SampleCode::TitleR(evt, "BitmapRect"); 107 return true; 108 } 109 return this->INHERITED::onQuery(evt); 110 } 111 112 void onDrawContent(SkCanvas* canvas) override { 113 SkRect srcR; 114 srcR.set(fSrcPts[0], fSrcPts[1]); 115 srcR = SkRect::MakeXYWH(fSrcPts[0].fX, fSrcPts[0].fY, 32, 32); 116 srcR.offset(-srcR.width()/2, -srcR.height()/2); 117 118 SkPaint paint; 119 paint.setStyle(SkPaint::kStroke_Style); 120 paint.setColor(SK_ColorYELLOW); 121 122 SkBitmap bitmap; 123 make_bitmap(&bitmap); 124 125 canvas->translate(20, 20); 126 127 canvas->drawBitmap(bitmap, 0, 0, &paint); 128 canvas->drawRect(srcR, paint); 129 130 for (int i = 0; i < 2; ++i) { 131 paint.setFilterQuality(1 == i ? kLow_SkFilterQuality : kNone_SkFilterQuality); 132 canvas->drawBitmapRect(bitmap, srcR, fDstR[i], &paint, 133 SkCanvas::kStrict_SrcRectConstraint); 134 canvas->drawRect(fDstR[i], paint); 135 } 136 } 137 138 bool onAnimate(const SkAnimTimer& timer) override { 139 if (timer.isStopped()) { 140 this->resetBounce(); 141 } else if (timer.isRunning()) { 142 this->bounce(); 143 } 144 return true; 145 } 146 147 private: 148 typedef SampleView INHERITED; 149 }; 150 151 ////////////////////////////////////////////////////////////////////////////// 152 153 static void make_big_bitmap(SkBitmap* bm) { 154 static const char gText[] = 155 "We the people, in order to form a more perfect union, establish justice," 156 " ensure domestic tranquility, provide for the common defense, promote the" 157 " general welfare and ensure the blessings of liberty to ourselves and our" 158 " posterity, do ordain and establish this constitution for the United" 159 " States of America."; 160 161 const int BIG_H = 120; 162 163 SkPaint paint; 164 paint.setAntiAlias(true); 165 paint.setTextSize(SkIntToScalar(BIG_H)); 166 167 const int BIG_W = SkScalarRoundToInt(paint.measureText(gText, strlen(gText))); 168 169 bm->allocN32Pixels(BIG_W, BIG_H); 170 bm->eraseColor(SK_ColorWHITE); 171 172 SkCanvas canvas(*bm); 173 174 canvas.drawString(gText, 0, paint.getTextSize()*4/5, paint); 175 } 176 177 class BitmapRectView2 : public SampleView { 178 SkBitmap fBitmap; 179 180 SkRect fSrcR; 181 SkRect fLimitR; 182 SkScalar fDX; 183 SkRect fDstR[2]; 184 185 void bounceMe() { 186 SkScalar width = fSrcR.width(); 187 bounce(&fSrcR.fLeft, &fDX, fLimitR.fLeft, fLimitR.fRight - width); 188 fSrcR.fRight = fSrcR.fLeft + width; 189 } 190 191 void resetBounce() { 192 fSrcR.iset(0, 0, fBitmap.height() * 3, fBitmap.height()); 193 fDX = SK_Scalar1; 194 } 195 196 public: 197 BitmapRectView2() { 198 make_big_bitmap(&fBitmap); 199 200 this->setBGColor(SK_ColorGRAY); 201 202 this->resetBounce(); 203 204 fLimitR.iset(0, 0, fBitmap.width(), fBitmap.height()); 205 206 fDstR[0] = SkRect::MakeXYWH(20, 20, 600, 200); 207 fDstR[1] = fDstR[0]; 208 fDstR[1].offset(0, fDstR[0].height() * 5/4); 209 } 210 211 protected: 212 bool onQuery(SkEvent* evt) override { 213 if (SampleCode::TitleQ(*evt)) { 214 SampleCode::TitleR(evt, "BigBitmapRect"); 215 return true; 216 } 217 return this->INHERITED::onQuery(evt); 218 } 219 220 void onDrawContent(SkCanvas* canvas) override { 221 SkPaint paint; 222 paint.setStyle(SkPaint::kStroke_Style); 223 paint.setColor(SK_ColorYELLOW); 224 225 for (int i = 0; i < 2; ++i) { 226 paint.setFilterQuality(1 == i ? kLow_SkFilterQuality : kNone_SkFilterQuality); 227 canvas->drawBitmapRect(fBitmap, fSrcR, fDstR[i], &paint, 228 SkCanvas::kStrict_SrcRectConstraint); 229 canvas->drawRect(fDstR[i], paint); 230 } 231 } 232 233 bool onAnimate(const SkAnimTimer& timer) override { 234 if (timer.isStopped()) { 235 this->resetBounce(); 236 } else if (timer.isRunning()) { 237 this->bounceMe(); 238 } 239 return true; 240 } 241 242 private: 243 typedef SampleView INHERITED; 244 }; 245 246 ////////////////////////////////////////////////////////////////////////////// 247 248 static SkView* F0() { return new BitmapRectView; } 249 static SkView* F1() { return new BitmapRectView2; } 250 static SkViewRegister gR0(F0); 251 static SkViewRegister gR1(F1); 252
