2D学习之Canvas

Paint paint =new Paint();

paint.setColor(Color.WHITE);

//-------

canvas.setDrawFilter(newDrawFilter());

//-------填充画布刷屏

canvas.drawColor(Color.BLACK);

//-------绘制文本

canvas.drawText("drawText",10,10, paint);

//-------绘制像素点

canvas.drawPoint(10,20, paint);

//-------绘制多个像素点

canvas.drawPoints(new float[]{10,30,30,30}, paint);

//-------绘制直线

canvas.drawLine(10,40,50,40, paint);

//-------绘制多条直线

canvas.drawLines(new float[]{10,50,50,50,70,50,110,50}, paint);

//-------绘制矩形

canvas.drawRect(10,60,40,100, paint);

//-------绘制圆角矩形

RectF rectF =newRectF(10,140,60,170);

canvas.drawRoundRect(rectF,20,20, paint);

//-------绘制圆形

canvas.drawCircle(20,200,20, paint);

//-------绘制弧形

canvas.drawArc(newRectF(150,20,200,70),0,230,true, paint);

//-------绘制椭圆

canvas.drawOval(newRectF(150,80,180,100), paint);

//-------绘制指定路径图形

Path path =new Path();

//设置路径起点

path.moveTo(160,150);

//路线1

path.lineTo(200,150);

//路线2

path.lineTo(180,200);

//路径结束

path.close();

canvas.drawPath(path, paint);

//-------绘制指定路径的图形

Path pathCircle =new Path();

//添加一个圆形的路径

pathCircle.addCircle(130,260,20, Path.Direction.CCW);

//-------绘制带圆形的路径文本

canvas.drawTextOnPath("path text", pathCircle,10,20, paint);