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