Home | History | Annotate | Download | only in samplecode 
      1 /*
      2  * Copyright 2016 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 "SkCanvas.h"
     10 #include "SkPath.h"
     11 #include "SkRandom.h"
     12 
     13 class MegaStrokeView : public SampleView {
     14 public:
     15     MegaStrokeView() {
     16         fClip.set(0, 0, 950, 600);
     17         fAngle = 0;
     18         fPlusMinus = 0;
     19         SkRandom rand;
     20         fMegaPath.reset();
     21         for (int index = 0; index < 921; ++index) {
     22             for (int segs = 0; segs < 40; ++segs) {
     23                 fMegaPath.lineTo(SkIntToScalar(index), SkIntToScalar(rand.nextRangeU(500, 600)));
     24             }
     25         }
     26     }
     27 
     28 protected:
     29     // overrides from SkEventSink
     30     bool onQuery(SkEvent* evt) override {
     31         if (SampleCode::TitleQ(*evt)) {
     32             SampleCode::TitleR(evt, "MegaStroke");
     33             return true;
     34         }
     35 
     36         SkUnichar uni;
     37         if (SampleCode::CharQ(*evt, &uni)) {
     38            fClip.set(0, 0, 950, 600);
     39         }
     40         SkString str;
     41         evt->getType(&str);
     42         if (str == SkString("SampleCode_Key_Event")) {
     43            fClip.set(0, 0, 950, 600);
     44         }
     45         return this->INHERITED::onQuery(evt);
     46     }
     47 
     48     void onDrawBackground(SkCanvas* canvas) override {
     49     }
     50 
     51     void onDrawContent(SkCanvas* canvas) override {
     52         SkPaint paint;
     53         paint.setAntiAlias(true);
     54         paint.setARGB(255,255,153,0);
     55         paint.setStyle(SkPaint::kStroke_Style);
     56         paint.setStrokeWidth(1);
     57 
     58         canvas->save();
     59         canvas->clipRect(fClip);
     60         canvas->clear(SK_ColorWHITE);
     61         canvas->drawPath(fMegaPath, paint);
     62         canvas->restore();
     63 
     64         SkPaint divSimPaint;
     65         divSimPaint.setColor(SK_ColorBLUE);
     66 	    SkScalar x = SkScalarSin(fAngle * SK_ScalarPI / 180) * 200 + 250;
     67 	    SkScalar y = SkScalarCos(fAngle * SK_ScalarPI / 180) * 200 + 250;
     68 
     69         if ((fPlusMinus ^= 1)) {
     70             fAngle += 5;
     71         } else {
     72             fAngle -= 5;
     73         }
     74         SkRect divSim = SkRect::MakeXYWH(x, y, 100, 100);
     75         divSim.outset(30, 30);
     76         canvas->drawRect(divSim, divSimPaint);
     77         fClip = divSim;
     78     }
     79 
     80     void onSizeChange() override {
     81         fClip.set(0, 0, 950, 600);
     82     }
     83 
     84     bool onAnimate(const SkAnimTimer& ) override {
     85         return true;
     86     }
     87 
     88 private:
     89     SkPath      fMegaPath;
     90     SkRect      fClip;
     91     int         fAngle;
     92     int         fPlusMinus;
     93     typedef SampleView INHERITED;
     94 };
     95 
     96 //////////////////////////////////////////////////////////////////////////////
     97 
     98 static SkView* MyFactory() { return new MegaStrokeView; }
     99 static SkViewRegister reg(MyFactory);
    100