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      1 
      2 /*
      3  * Copyright 2011 Google Inc.
      4  *
      5  * Use of this source code is governed by a BSD-style license that can be
      6  * found in the LICENSE file.
      7  */
      8 #include "SampleCode.h"
      9 #include "SkView.h"
     10 #include "SkCanvas.h"
     11 #include "SkGraphics.h"
     12 #include "SkRandom.h"
     13 #include "SkDashPathEffect.h"
     14 #include "SkShader.h"
     15 
     16 static void setBitmapDash(SkPaint* paint, int width) {
     17     SkColor c = paint->getColor();
     18 
     19     SkBitmap bm;
     20     bm.allocN32Pixels(2, 1);
     21     bm.lockPixels();
     22     *bm.getAddr32(0, 0) = SkPreMultiplyARGB(0xFF, SkColorGetR(c),
     23                                             SkColorGetG(c), SkColorGetB(c));
     24     *bm.getAddr32(1, 0) = 0;
     25     bm.unlockPixels();
     26 
     27     SkMatrix matrix;
     28     matrix.setScale(SkIntToScalar(width), SK_Scalar1);
     29 
     30     SkShader* s = SkShader::CreateBitmapShader(bm, SkShader::kRepeat_TileMode,
     31                                                SkShader::kClamp_TileMode, &matrix);
     32 
     33     paint->setShader(s)->unref();
     34 }
     35 
     36 class DashView : public SampleView {
     37 public:
     38     DashView() {
     39         this->setBGColor(0xFFDDDDDD);
     40     }
     41 
     42 protected:
     43     // overrides from SkEventSink
     44     virtual bool onQuery(SkEvent* evt) {
     45         if (SampleCode::TitleQ(*evt)) {
     46             SampleCode::TitleR(evt, "Dash");
     47             return true;
     48         }
     49         return this->INHERITED::onQuery(evt);
     50     }
     51 
     52     virtual void onDrawContent(SkCanvas* canvas) {
     53         static const char* gStr[] = {
     54             "11",
     55             "44",
     56             "112233",
     57             "411327463524",
     58         };
     59 
     60         SkPaint paint;
     61         paint.setStrokeWidth(SkIntToScalar(1));
     62 
     63         SkScalar x0 = SkIntToScalar(10);
     64         SkScalar y0 = SkIntToScalar(10);
     65         SkScalar x1 = x0 + SkIntToScalar(1000);
     66         for (size_t i = 0; i < SK_ARRAY_COUNT(gStr); i++) {
     67             SkScalar interval[12];
     68             size_t len = SkMin32(strlen(gStr[i]), SK_ARRAY_COUNT(interval));
     69             for (size_t j = 0; j < len; j++) {
     70                 interval[j] = SkIntToScalar(gStr[i][j] - '0');
     71             }
     72 
     73             SkDashPathEffect dash(interval, len, 0);
     74             paint.setPathEffect(&dash);
     75             canvas->drawLine(x0, y0, x1, y0, paint);
     76             paint.setPathEffect(NULL);
     77 
     78             y0 += paint.getStrokeWidth() * 3;
     79         }
     80 
     81         setBitmapDash(&paint, 3);
     82         canvas->drawLine(x0, y0, x1, y0, paint);
     83     }
     84 
     85 private:
     86     typedef SampleView INHERITED;
     87 };
     88 
     89 //////////////////////////////////////////////////////////////////////////////
     90 
     91 static SkView* MyFactory() { return new DashView; }
     92 static SkViewRegister reg(MyFactory);
     93