samplecode/SampleLines.cpp

   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 "SkView.h"
  10 #include "SkCanvas.h"
  11 #include "SkCornerPathEffect.h"
  12 #include "SkGradientShader.h"
  13 #include "SkGraphics.h"
  14 #include "SkImageDecoder.h"
  15 #include "SkPath.h"
  16 #include "SkRandom.h"
  17 #include "SkRegion.h"
  18 #include "SkShader.h"
  19 #include "SkUtils.h"
  20 #include "SkColorPriv.h"
  21 #include "SkColorFilter.h"
  22 #include "SkTime.h"
  23 #include "SkTypeface.h"
  24 #include "SkXfermode.h"
  25
  26 #include "SkStream.h"
  27 #include "SkXMLParser.h"
  28 #include "SkColorPriv.h"
  29 #include "SkImageDecoder.h"
  30
  31 class LinesView : public SampleView {
  32 public:
  33     LinesView() {}
  34
  35 protected:
  36     // overrides from SkEventSink
  37     virtual bool onQuery(SkEvent* evt) {
  38         if (SampleCode::TitleQ(*evt)) {
  39             SampleCode::TitleR(evt, "Lines");
  40             return true;
  41         }
  42         return this->INHERITED::onQuery(evt);
  43     }
  44
  45     /*
  46      0x1F * x + 0x1F * (32 - x)
  47      */
  48     void drawRings(SkCanvas* canvas) {
  49         canvas->scale(SkIntToScalar(1)/2, SkIntToScalar(1)/2);
  50
  51         SkRect  r;
  52         SkScalar x = SkIntToScalar(10);
  53         SkScalar y = SkIntToScalar(10);
  54         r.set(x, y, x + SkIntToScalar(100), y + SkIntToScalar(100));
  55
  56         SkPaint paint;
  57      //   paint.setAntiAlias(true);
  58         paint.setStyle(SkPaint::kStroke_Style);
  59         paint.setStrokeWidth(SkScalarHalf(SkIntToScalar(3)));
  60         paint.setColor(0xFFFF8800);
  61      //   paint.setColor(0xFFFFFFFF);
  62         canvas->drawRect(r, paint);
  63     }
  64
  65     virtual void onDrawContent(SkCanvas* canvas) {
  66         SkBitmap bm;
  67         SkImageDecoder::DecodeFile("/kill.gif", &bm);
  68         canvas->drawBitmap(bm, 0, 0, NULL);
  69
  70         this->drawRings(canvas);
  71         return;
  72
  73         SkPaint paint;
  74
  75       //  fAlpha = 0x80;
  76         paint.setColor(SK_ColorWHITE);
  77         paint.setAlpha(fAlpha & 0xFF);
  78         SkRect r;
  79
  80         SkScalar x = SkIntToScalar(10);
  81         SkScalar y = SkIntToScalar(10);
  82         r.set(x, y, x + SkIntToScalar(100), y + SkIntToScalar(100));
  83         canvas->drawRect(r, paint);
  84         return;
  85
  86         paint.setColor(0xffffff00);            // yellow
  87         paint.setStyle(SkPaint::kStroke_Style);
  88         paint.setStrokeWidth(SkIntToScalar(2));
  89
  90 //        y += SK_Scalar1/2;
  91
  92         canvas->drawLine(x, y, x + SkIntToScalar(90), y + SkIntToScalar(90), paint);
  93
  94         paint.setAntiAlias(true);              // with anti-aliasing
  95         y += SkIntToScalar(10);
  96         canvas->drawLine(x, y, x + SkIntToScalar(90), y + SkIntToScalar(90), paint);
  97     }
  98
  99     SkView::Click* onFindClickHandler(SkScalar x, SkScalar y, unsigned) override {
 100         fAlpha = SkScalarRoundToInt(y);
 101         this->inval(NULL);
 102         return NULL;
 103     }
 104 private:
 105
 106     int fAlpha;
 107     typedef SampleView INHERITED;
 108 };
 109
 110 //////////////////////////////////////////////////////////////////////////////
 111
 112 static SkView* MyFactory() { return new LinesView; }
 113 static SkViewRegister reg(MyFactory);