Android(安卓)Shape 形状

Shape继承体系：

Shape (android.graphics.drawable.shapes)
----PathShape (android.graphics.drawable.shapes)
----RectShape (android.graphics.drawable.shapes)
--------ArcShape (android.graphics.drawable.shapes)
--------OvalShape (android.graphics.drawable.shapes)
--------RoundRectShape (android.graphics.drawable.shapes)

RectShape

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RectShaperectShape=newRectShape();
ShapeDrawabledrawable=newShapeDrawable(rectShape);
drawable.getPaint().setColor(Color.RED);
drawable.getPaint().setStyle(Paint.Style.FILL);//填充
view.setBackgroundDrawable(drawable);

矩形

RoundRectShape

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float[]outerRadii={20,20,40,40,60,60,80,80};//外矩形左上、右上、右下、左下圆角半径
//float[]outerRadii={20,20,20,20,20,20,20,20};//外矩形左上、右上、右下、左下圆角半径
RectFinset=newRectF(100,100,200,200);//内矩形距外矩形，左上角x,y距离，右下角x,y距离
float[]innerRadii={20,20,20,20,20,20,20,20};//内矩形圆角半径
//RoundRectShaperoundRectShape=newRoundRectShape(outerRadii,inset,innerRadii);
RoundRectShaperoundRectShape=newRoundRectShape(outerRadii,null,innerRadii);//无内矩形
ShapeDrawabledrawable=newShapeDrawable(roundRectShape);
drawable.getPaint().setColor(Color.MAGENTA);
drawable.getPaint().setAntiAlias(true);
drawable.getPaint().setStyle(Paint.Style.STROKE);//描边
view.setBackground(drawable);

无内矩形的圆角矩形带内矩形的圆角矩形

OvalShape

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OvalShapeovalShape=newOvalShape();
ShapeDrawabledrawable=newShapeDrawable(ovalShape);
drawable.getPaint().setColor(Color.RED);
drawable.getPaint().setStyle(Paint.Style.FILL_AND_STROKE);
view.setBackgroundDrawable(drawable);

椭圆。而当View的宽高相等时，就绘出了圆

ArcShape

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ArcShapearcShape=newArcShape(45,270);//顺时针开始角度45，扫描的角度270扇形
ShapeDrawabledrawable=newShapeDrawable(arcShape);
drawable.getPaint().setColor(Color.RED);
drawable.getPaint().setStyle(Paint.Style.FILL);
//Bitmapbitmap=((BitmapDrawable)getResources().getDrawable(R.drawable.aa)).getBitmap();
//BitmapShaderbitmapShader=newBitmapShader(bitmap,Shader.TileMode.MIRROR,Shader
//.TileMode.REPEAT);
//Matrixmatrix=newMatrix();
//matrix.preScale(600.00f/bitmap.getWidth(),600.00f/bitmap.getHeight());//view:w=600,h=600
//bitmapShader.setLocalMatrix(matrix);
//drawable.getPaint().setShader(bitmapShader);
view.setBackgroundDrawable(drawable);

扇形图

结合BitmapShader

PathShape

[java] view plain copy print ?

Pathpath=newPath();
path.moveTo(50,0);
path.lineTo(0,50);
path.lineTo(50,100);
path.lineTo(100,50);
path.lineTo(50,0);
PathShapepathShape=newPathShape(path,200,100);
ShapeDrawabledrawable=newShapeDrawable(pathShape);
drawable.getPaint().setColor(Color.RED);
drawable.getPaint().setStyle(Paint.Style.FILL);
imageView.setBackgroundDrawable(drawable);

以Path路径对象，来设定图形。

PathShape的构造函数：PathShape(path, stdWidth, stdHeight);

stdWidth：标准宽度

stdHeight：标准高度

在构造PathShape对象时，设置了宽高的标准。内部函数

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protectedvoidonResize(floatwidth,floatheight){
mScaleX=width/mStdWidth;
mScaleY=height/mStdHeight;
}
publicvoiddraw(Canvascanvas,Paintpaint){
canvas.save();
canvas.scale(mScaleX,mScaleY);
canvas.drawPath(mPath,paint);
canvas.restore();
}

Shape基类中有函数 resize()，其中调用了onResize()；ShapeDrawable中会调用resize()。

有了设定的标准宽高，再算出实际宽高与标准宽高的比率，最后在绘制时，画布canvas缩放。

造成的效果： path中的(x,y)坐标值乘以比率值，即是最终呈现出的坐标值(实际内部是缩放的canvas)

比如，这里view的 w=400， h=400

如果标准宽高都等于400，那么canvas最终不缩放，即1:1。

PathShape pathShape = new PathShape(path, 400, 400);

stdx=400, stdy=400

PathShape pathShape = new PathShape(path, 100, 100);

stdx=100, stdy=100

PathShape pathShape = new PathShape(path, 200, 100);

stdx=200, stdy=100

Shape继承体系：

RectShape

RoundRectShape

OvalShape

ArcShape

PathShape

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