Android 绘画

canvas = sfh.lockCanvas();
if (canvas != null) {
canvas.drawColor(Color.WHITE);
//-----设置画笔无锯齿
Paint paint1 = new Paint();
canvas.drawCircle(40, 30, 20, paint1);
paint1.setAntiAlias(true);
canvas.drawCircle(100, 30, 20, paint1);
//-----设置画笔的透明度
canvas.drawText("无透明度", 100, 70, new Paint());
Paint paint2 = new Paint();
paint2.setAlpha(0x77);
canvas.drawText("半透明度", 20, 70, paint2);
//-----设置绘制文本的锚点
canvas.drawText("锚点", 20, 90, new Paint());
Paint paint3 = new Paint();
//设置以文本的中心点绘制
paint3.setTextAlign(Paint.Align.CENTER);
canvas.drawText("锚点", 20, 105, paint3);
//------获取文本的长度
Paint paint4 = new Paint();
float len =paint4.measureText("文本宽度:");
canvas.drawText("文本长度:"+len, 20, 130, new Paint());
//------设置画笔样式
canvas.drawRect(new Rect(20,140,40,160), new Paint());
Paint paint5 = new Paint();
//设置画笔不填充
paint5.setStyle(Style.STROKE);
canvas.drawRect(new Rect(60,140,80,160), paint5);
//------设置画笔颜色
Paint paint6 = new Paint();
paint6.setColor(Color.GRAY);
canvas.drawText("灰色", 30, 180, paint6);
//------设置画笔的粗细程度
canvas.drawLine(20, 200,70, 200, new Paint());
Paint paint7 = new Paint();
paint7.setStrokeWidth(7);
canvas.drawLine(20, 220,70, 220,paint7);
//------设置画笔绘制文本的字体粗细
Paint paint8 = new Paint();
paint8.setTextSize(20);
canvas.drawText("文字尺寸", 20, 260, paint8);
//------设置画笔的ARGB分量
Paint paint9 = new Paint();
paint9.setARGB(0x77, 0xff, 0x00, 0x00);
canvas.drawText("红色半透明", 20, 290, paint9);