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android画图----ShapeDrawable和shader


在这个例程中主要讲述了ShapeDrawable,以及各种Gradient
首先初始化了 mDrawables = new ShapeDrawable[7];默认的是矩形,
当然还有其他形状:

mDrawables[0] = new ShapeDrawable(new RectShape()); 

 mDrawables[1] = new ShapeDrawable(new OvalShape()); 

 mDrawables[4] = new ShapeDrawable(new RoundRectShape(outerR, inset, 

 innerR)); 

 mDrawables[5] = new ShapeDrawable(new PathShape(path, 100, 100)); 

float[] outerR = new float[] { 12, 12, 12, 12, 0, 0, 0, 0 }; 

 RectF inset = new RectF(20, 20, 20, 20); 

 float[] innerR = new float[] { 12, 12, 0, 0, 12, 12, 0, 0 }; 


 Path path = new Path(); 

 path.moveTo(50, 0); 

 path.lineTo(0, 50); 

 path.lineTo(50, 100); 

 path.lineTo(100, 50); 

 path.close();



实例化ShapeDrawable后就可以对他们进行设置:
设置渐变
mDrawables[0].getPaint().setShader(makeTiling());
设置颜色
mDrawables[1].getPaint().setColor(0xFF00FF00);
设置影响 影响呢有很多 可以设置单个 也可以用组合
PathEffect pe = new DiscretePathEffect(10, 2);
PathEffect pe2 = new CornerPathEffect(8);
mDrawables[3].getPaint().setPathEffect(
new SumPathEffect(pe2, pe));
其中渐变又包括:

private static Shader makeSweep() { 

 return new SweepGradient(150, 25, new int[] { 0xFFFF0000, 0xFF00FF00, 0xFF0000FF, 0xFFFF0000 }, null); 

 //return new SweepGradient(150, 25, new int[] { 0xFFFF0000, 0xFF00FF00, 0xFF0000FF }, new float[]{0.9f,0.1f,0.9f}); 

 } 


 private static Shader makeLinear() { 

 return new LinearGradient(0, 0, 50, 50, 

 new int[] { 0xFFFF0000, 0xFF00FF00, 0xFF0000FF }, 

 null, Shader.TileMode.REPEAT); 

 } 


 private Shader makeTiling() { 

 int[] pixels = new int[] { 0xFFFF0000, 0xFF00FF00, 0xFF0000FF, 0}; 


 Bitmap bm = Bitmap.createBitmap(pixels, 2, 2, Bitmap.Config.ARGB_8888); 

 // Bitmap bm = Bitmap.createBitmap(mBitmap, 60, 45, Bitmap.Config.ARGB_8888); 


 return new BitmapShader(bm, Shader.TileMode.REPEAT, 

 Shader.TileMode.REPEAT); 

 }


最后在这个实例中 可以自定义一个ShapeDrawable

private static class MyShapeDrawable extends ShapeDrawable { 

 private Paint mStrokePaint = new Paint(Paint.LINEAR_TEXT_FLAG); 


 public MyShapeDrawable(Shape s) { 

 super(s); 

 mStrokePaint.setStyle(Paint.Style.STROKE); 

 mStrokePaint.setColor(Color.GREEN); 

 } 


 public Paint getStrokePaint() { 

 return mStrokePaint; 

 } 


 @Override protected void onDraw(Shape s, Canvas c, Paint p) { 

//第一个调用父类的p,第二个调用自己刚才设置的p,如果你不想使用默认的父类,默认的颜色为黑了 

 s.draw(c, p); 

 s.draw(c, mStrokePaint); 

 } 


 mDrawables[6] = new MyShapeDrawable(new ArcShape(45, 360)); 

 MyShapeDrawable msd = (MyShapeDrawable)mDrawables[6]; 

 msd.getStrokePaint().setStrokeWidth(1); 

 }

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