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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 "SkCanvas.h"
     10 #include "SkGradientShader.h"
     11 
     12 class GradientView : public SampleView {
     13 public:
     14 	GradientView() {
     15         this->setBGColor(0xFFDDDDDD);
     16 	}
     17 
     18 protected:
     19 	struct GradData {
     20         int             fCount;
     21         const SkColor*  fColors;
     22         const SkScalar* fPos;
     23     };
     24     // overrides from SkEventSink
     25     virtual bool onQuery(SkEvent* evt)  {
     26         if (SampleCode::TitleQ(*evt)) {
     27             SampleCode::TitleR(evt, "Gradients");
     28             return true;
     29         }
     30         return this->INHERITED::onQuery(evt);
     31     }
     32     virtual void onDrawContent(SkCanvas* canvas) {
     33         SkPaint paint;
     34         paint.setAntiAlias(true);
     35         paint.setStyle(SkPaint::kStroke_Style);
     36         paint.setStrokeWidth(SkScalarHalf(SkIntToScalar(3)));
     37         paint.setStyle(SkPaint::kFill_Style);
     38 
     39         SkPoint p = SkPoint::Make(0,0);
     40         SkPoint q = SkPoint::Make(100,100);
     41         SkPoint pts[] = {p, q};
     42 
     43         SkScalar t, temp, x, y;
     44         SkColor gColors[] = {
     45             SK_ColorRED, SK_ColorGREEN, SK_ColorBLUE, SK_ColorWHITE, SK_ColorBLACK
     46         };
     47         t =    SampleCode::GetAnimScalar(SkIntToScalar(2), SkIntToScalar(20));
     48         temp = SampleCode::GetAnimScalar(SkIntToScalar(1), SkIntToScalar(8));
     49         SkScalar step = SK_ScalarPI / (10);
     50         SkScalar angle = t * step;
     51         x =  SkScalarSinCos(angle, &y);
     52         SkScalar colorPositions[] = { 0, 0.1 + x, 0.4 + y, 0.9 - x + y, 1.0};
     53         GradData data = { 5, gColors, colorPositions };
     54 
     55 
     56         SkRect r = { 0, 0, SkIntToScalar(200), SkIntToScalar(200) };
     57         SkShader* shader1 = SkGradientShader::CreateLinear(
     58                            pts, data.fColors, data.fPos,data.fCount,
     59                            SkShader::kMirror_TileMode);
     60         paint.setShader(shader1)->unref();
     61 
     62         canvas->drawRect(r, paint);
     63 
     64 
     65         SkPoint s = SkPoint::Make(100,100);
     66         SkShader* shader2 = SkGradientShader::CreateRadial(
     67                            s, 100, data.fColors, data.fPos, data.fCount,
     68                            SkShader::kMirror_TileMode);
     69         paint.setShader(shader2)->unref();
     70         canvas->translate(250, 0);
     71         canvas->drawRect(r, paint);
     72 
     73         SkShader* shader3 = SkGradientShader::CreateTwoPointRadial(
     74                            p, 0, q, 100, data.fColors, data.fPos, data.fCount,
     75                            SkShader::kMirror_TileMode);
     76         paint.setShader(shader3)->unref();
     77         canvas->translate(0, 250);
     78         canvas->drawRect(r, paint);
     79 
     80         SkShader* shader4 = SkGradientShader::CreateSweep(
     81                             100, 100, data.fColors, data.fPos, data.fCount);
     82 
     83         paint.setShader(shader4)->unref();
     84         canvas->translate(-250, 0);
     85         canvas->drawRect(r, paint);
     86 
     87         this->inval(NULL);
     88     }
     89 
     90 private:
     91     typedef SampleView INHERITED;
     92 };
     93 
     94 //////////////////////////////////////////////////////////////////////////////
     95 
     96 static SkView* MyFactory() { return new GradientView; }
     97 static SkViewRegister reg(MyFactory);