Android 中 drawTextOnPath 文字效果演示（中级）

Android中drawTextOnPath文字效果演示（中级）

Android中Canvas提供了一个drawTextOnPath（Stringtext,Pathath,floathOffset,floatvOffset,Patingpaint）方法，该方法可以沿着Path绘制文本其中hOffset参数指定水平偏移vOffset参数指定垂直偏移

上代码

privatestaticclassmytextextendsView{

privatePaintpaint;

privatestaticfinalStringSKY="skyoceanone";

privatePathpaths[]=newPath[3];

publicmytext(Contextcontext){

super(context);

paint=newPaint();

paint.setColor(Color.RED);

paint.setAntiAlias(true);

paint.setTextAlign(Paint.Align.RIGHT);//设置从右变开始写字

paint.setTextSize(20);

paths[0]=newPath();

paths[0].moveTo(0,0);

for(inti=0;i<15;i++){//一条线的路径

paths[0].lineTo(i*30,(float)Math.random()*60);

}

paths[1]=newPath();

RectFoval=newRectF(0,0,300,200);

paths[1].addOval(oval,Path.Direction.CCW);//一个椭圆的路径

paths[2]=newPath();

paths[2].addArc(oval,60,180);//一个弧线的路径

}

@Override

protectedvoidonDraw(Canvascanvas){

//TODOAuto-generatedmethodstub

super.onDraw(canvas);

canvas.drawColor(Color.WHITE);

paint.setStyle(Paint.Style.STROKE);

paint.setStrokeWidth(1);

canvas.translate(0,20);

//以线路径为列子如果hOffsetvOffset两个参数为0效果如图一会沿着线上走

//参数为0，20则会向下20个像素点如图二

canvas.drawPath(paths[0],paint);

canvas.drawTextOnPath(SKY,paths[0],0,20,paint);

canvas.translate(0,120);

canvas.drawPath(paths[2],paint);

canvas.drawTextOnPath(SKY,paths[2],-30,30,paint);

canvas.translate(0,240);

paint.setStyle(Paint.Style.FILL);

canvas.drawPath(paths[1],paint);

canvas.drawTextOnPath(SKY,paths[1],-30,30,paint);

}

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