reed@android.com | 8a1c16f | 2008-12-17 15:59:43 +0000 | [diff] [blame] | 1 | #include "SampleCode.h" |
| 2 | #include "SkView.h" |
| 3 | #include "SkCanvas.h" |
| 4 | #include "SkCornerPathEffect.h" |
| 5 | #include "SkCullPoints.h" |
| 6 | #include "SkGradientShader.h" |
| 7 | #include "SkPath.h" |
| 8 | #include "SkRegion.h" |
| 9 | #include "SkShader.h" |
| 10 | #include "SkUtils.h" |
| 11 | #include "SkRandom.h" |
| 12 | |
| 13 | static void addbump(SkPath* path, const SkPoint pts[2], SkScalar bump) |
| 14 | { |
| 15 | SkVector tang; |
| 16 | |
| 17 | tang.setLength(pts[1].fX - pts[0].fX, pts[1].fY - pts[0].fY, bump); |
| 18 | |
| 19 | path->lineTo(SkScalarHalf(pts[0].fX + pts[1].fX) - tang.fY, |
| 20 | SkScalarHalf(pts[0].fY + pts[1].fY) + tang.fX); |
| 21 | path->lineTo(pts[1]); |
| 22 | } |
| 23 | |
| 24 | static void subdivide(SkPath* path, SkScalar bump) |
| 25 | { |
| 26 | SkPath::Iter iter(*path, false); |
| 27 | SkPoint pts[4]; |
| 28 | SkPath tmp; |
| 29 | |
| 30 | for (;;) |
| 31 | switch (iter.next(pts)) { |
| 32 | case SkPath::kMove_Verb: |
| 33 | tmp.moveTo(pts[0]); |
| 34 | break; |
| 35 | case SkPath::kLine_Verb: |
| 36 | addbump(&tmp, pts, bump); |
| 37 | bump = -bump; |
| 38 | break; |
| 39 | case SkPath::kDone_Verb: |
| 40 | goto FINISH; |
| 41 | default: |
| 42 | break; |
| 43 | } |
| 44 | |
| 45 | FINISH: |
| 46 | path->swap(tmp); |
| 47 | } |
| 48 | |
| 49 | static SkIPoint* getpts(const SkPath& path, int* count) |
| 50 | { |
| 51 | SkPoint pts[4]; |
| 52 | int n = 1; |
| 53 | SkIPoint* array; |
| 54 | |
| 55 | { |
| 56 | SkPath::Iter iter(path, false); |
| 57 | for (;;) |
| 58 | switch (iter.next(pts)) { |
| 59 | case SkPath::kLine_Verb: |
| 60 | n += 1; |
| 61 | break; |
| 62 | case SkPath::kDone_Verb: |
| 63 | goto FINISHED; |
| 64 | default: |
| 65 | break; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | FINISHED: |
| 70 | array = new SkIPoint[n]; |
| 71 | n = 0; |
| 72 | |
| 73 | { |
| 74 | SkPath::Iter iter(path, false); |
| 75 | for (;;) |
| 76 | switch (iter.next(pts)) { |
| 77 | case SkPath::kMove_Verb: |
| 78 | array[n++].set(SkScalarRound(pts[0].fX), SkScalarRound(pts[0].fY)); |
| 79 | break; |
| 80 | case SkPath::kLine_Verb: |
| 81 | array[n++].set(SkScalarRound(pts[1].fX), SkScalarRound(pts[1].fY)); |
| 82 | break; |
| 83 | case SkPath::kDone_Verb: |
| 84 | goto FINISHED2; |
| 85 | default: |
| 86 | break; |
| 87 | } |
| 88 | } |
| 89 | |
| 90 | FINISHED2: |
| 91 | *count = n; |
| 92 | return array; |
| 93 | } |
| 94 | |
| 95 | static SkScalar nextScalarRange(SkRandom& rand, SkScalar min, SkScalar max) |
| 96 | { |
| 97 | return min + SkScalarMul(rand.nextUScalar1(), max - min); |
| 98 | } |
| 99 | |
| 100 | class CullView : public SkView { |
| 101 | public: |
| 102 | CullView() |
| 103 | { |
| 104 | fClip.set(0, 0, SkIntToScalar(160), SkIntToScalar(160)); |
| 105 | |
| 106 | SkRandom rand; |
| 107 | |
| 108 | for (int i = 0; i < 50; i++) { |
| 109 | int x = nextScalarRange(rand, -fClip.width()*1, fClip.width()*2); |
| 110 | int y = nextScalarRange(rand, -fClip.height()*1, fClip.height()*2); |
| 111 | if (i == 0) |
| 112 | fPath.moveTo(x, y); |
| 113 | else |
| 114 | fPath.lineTo(x, y); |
| 115 | } |
| 116 | |
| 117 | SkScalar bump = fClip.width()/8; |
| 118 | subdivide(&fPath, bump); |
| 119 | subdivide(&fPath, bump); |
| 120 | subdivide(&fPath, bump); |
| 121 | fPoints = getpts(fPath, &fPtCount); |
| 122 | } |
| 123 | |
| 124 | virtual ~CullView() |
| 125 | { |
| 126 | delete[] fPoints; |
| 127 | } |
| 128 | |
| 129 | protected: |
| 130 | // overrides from SkEventSink |
| 131 | virtual bool onQuery(SkEvent* evt) |
| 132 | { |
| 133 | if (SampleCode::TitleQ(*evt)) |
| 134 | { |
| 135 | SampleCode::TitleR(evt, "Culling"); |
| 136 | return true; |
| 137 | } |
| 138 | return this->INHERITED::onQuery(evt); |
| 139 | } |
| 140 | |
| 141 | void drawBG(SkCanvas* canvas) |
| 142 | { |
| 143 | canvas->drawColor(0xFFDDDDDD); |
| 144 | |
| 145 | #if 0 |
| 146 | SkPaint paint; |
| 147 | |
| 148 | paint.setAntiAliasOn(true); |
| 149 | paint.setTextSize(SkIntToScalar(20)); |
| 150 | paint.setTypeface(SkTypeface::Create("serif", SkTypeface::kBoldItalic))->unref(); |
| 151 | |
| 152 | uint16_t text[20]; |
| 153 | |
| 154 | text[0] = 'H'; |
| 155 | text[1] = 'i'; |
| 156 | text[2] = ' '; |
| 157 | for (int i = 3; i < 20; i++) |
| 158 | text[i] = 0x3040 + i; |
| 159 | canvas->drawText16(text, 20, SkIntToScalar(20), SkIntToScalar(20), paint); |
| 160 | #endif |
| 161 | } |
| 162 | |
| 163 | virtual void onDraw(SkCanvas* canvas) |
| 164 | { |
| 165 | this->drawBG(canvas); |
| 166 | |
| 167 | SkAutoCanvasRestore ar(canvas, true); |
| 168 | |
| 169 | canvas->translate( SkScalarHalf(this->width() - fClip.width()), |
| 170 | SkScalarHalf(this->height() - fClip.height())); |
| 171 | |
| 172 | // canvas->scale(SK_Scalar1*3, SK_Scalar1*3, 0, 0); |
| 173 | |
| 174 | SkPaint paint; |
| 175 | |
| 176 | // paint.setAntiAliasOn(true); |
| 177 | paint.setStyle(SkPaint::kStroke_Style); |
| 178 | |
| 179 | canvas->drawRect(fClip, paint); |
| 180 | |
| 181 | #if 1 |
| 182 | paint.setColor(0xFF555555); |
| 183 | paint.setStrokeWidth(SkIntToScalar(2)); |
| 184 | // paint.setPathEffect(new SkCornerPathEffect(SkIntToScalar(30)))->unref(); |
| 185 | canvas->drawPath(fPath, paint); |
| 186 | // paint.setPathEffect(NULL); |
| 187 | #endif |
| 188 | |
| 189 | SkPath tmp; |
| 190 | SkIRect iclip; |
| 191 | fClip.round(&iclip); |
| 192 | |
| 193 | SkCullPointsPath cpp(iclip, &tmp); |
| 194 | |
| 195 | cpp.moveTo(fPoints[0].fX, fPoints[0].fY); |
| 196 | for (int i = 0; i < fPtCount; i++) |
| 197 | cpp.lineTo(fPoints[i].fX, fPoints[i].fY); |
| 198 | |
| 199 | paint.setColor(SK_ColorRED); |
| 200 | paint.setStrokeWidth(SkIntToScalar(3)); |
| 201 | paint.setStrokeJoin(SkPaint::kRound_Join); |
| 202 | canvas->drawPath(tmp, paint); |
| 203 | |
| 204 | this->inval(NULL); |
| 205 | } |
| 206 | |
| 207 | virtual SkView::Click* onFindClickHandler(SkScalar x, SkScalar y) |
| 208 | { |
| 209 | return this->INHERITED::onFindClickHandler(x, y); |
| 210 | } |
| 211 | |
| 212 | virtual bool onClick(Click* click) |
| 213 | { |
| 214 | return this->INHERITED::onClick(click); |
| 215 | } |
| 216 | |
| 217 | private: |
| 218 | SkRect fClip; |
| 219 | SkIPoint* fPoints; |
| 220 | SkPath fPath; |
| 221 | int fPtCount; |
| 222 | |
| 223 | typedef SkView INHERITED; |
| 224 | }; |
| 225 | |
| 226 | ////////////////////////////////////////////////////////////////////////////// |
| 227 | |
| 228 | static SkView* MyFactory() { return new CullView; } |
| 229 | static SkViewRegister reg(MyFactory); |
| 230 | |