Graphics类详解

1. Paint

    setAntiAlias:设置画笔的抗锯齿效果

    setColor:设置画笔的颜色

    setAlpha:设置Alpha值

    setTextSize:设置字体大小

    setStyle:设置画笔的风格, Paint.style.FILL(实心) Paint.style.STROKE(空心)

    setStrokeWidth:设置空心的边框宽度

    getColor:得到画笔颜色

    getAlpha:得到Alpha值

2. Color

     Color.BLACK 黑色

     ...

3. Canvas
    Canvas() :创建一个空的画布

    Canvas(Bitmap bitmap): 以bitmap对象创建一个画布

    Canvas(GL gl):OpenGLx相关

    drawColor: 设置Canvas的背景颜色

    setBitmap:设置具体画布

    clipRect: 设置显示区域

    isOpaque: 设置是否支持透明

    rotate:旋转画布

    setViewport: 设置画布中的显示窗口

    skew: 设置偏移量

//Canvas
try {
        canvas = sfh.lockCanvas();
        if (canvas != null) {
            //----设置画布绘图无锯齿
            canvas.setDrawFilter(pfd);
            //----利用填充画布，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);
            //----绘制矩形2
            Rect rect = new Rect(10, 110, 60, 130);
            canvas.drawRect(rect, paint);
            canvas.drawRect(rect, paint);
            //----绘制圆角矩形
            RectF rectF = new RectF(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(new RectF(150, 20, 200, 70), 0, 230, true, paint);
            //----绘制椭圆
            canvas.drawOval(new RectF(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("PathText", pathCircle, 10, 20, paint);
        }
    } catch (Exception e) {
        // TODO: handle exception
    } finally {
        if (canvas != null)
            sfh.unlockCanvasAndPost(canvas);
    }

//Paint

try {

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);

}

} catch (Exception e) {

// TODO: handle exception

} finally {

if (canvas != null)

sfh.unlockCanvasAndPost(canvas);

}

//Bitmap

try {

canvas = sfh.lockCanvas();

if (canvas != null) {

canvas.drawColor(Color.BLACK);

//----------绘制位图

//canvas.drawBitmap(bmp, 0, 0, paint);

//----------旋转位图(方式1)

//canvas.save();

//canvas.rotate(30, bmp.getWidth()/2, bmp.getHeight()/2);

//canvas.drawBitmap(bmp, 0, 0, paint);

//canvas.restore();

//canvas.drawBitmap(bmp, 100, 0, paint);

//----------旋转位图(方式2)

//Matrix mx = new Matrix();

//mx.postRotate(30, bmp.getWidth() / 2, bmp.getHeight() / 2);

//canvas.drawBitmap(bmp, mx, paint);

//----------平移位图(方式1)

//canvas.save();

//canvas.translate(10, 10);

//canvas.drawBitmap(bmp, 0, 0, paint);

//canvas.restore();

//----------平移位图(方式2)

//Matrix maT = new Matrix();

//maT.postTranslate(10, 10);

//canvas.drawBitmap(bmp, maT, paint);

//----------缩放位图(方式1)

//canvas.save();

//canvas.scale(2f, 2f, 50 + bmp.getWidth() / 2, 50 + bmp.getHeight() / 2);

//canvas.drawBitmap(bmp, 50, 50, paint);

//canvas.restore();

//canvas.drawBitmap(bmp, 50, 50, paint);

//----------缩放位图(方式2)

//Matrix maS = new Matrix();

//maS.postTranslate(50, 50);

//maS.postScale(2f, 2f, 50 + bmp.getWidth() / 2, 50 + bmp.getHeight() / 2);

//canvas.drawBitmap(bmp, maS, paint);

//canvas.drawBitmap(bmp, 50, 50, paint);

//----------镜像反转位图(方式1)

//X轴镜像

//canvas.drawBitmap(bmp, 0, 0, paint);

//canvas.save();

//canvas.scale(-1, 1, 100 + bmp.getWidth() / 2, 100 + bmp.getHeight() / 2);

//canvas.drawBitmap(bmp, 100, 100, paint);

//canvas.restore();

//Y轴镜像

//canvas.drawBitmap(bmp, 0, 0, paint);

//canvas.save();

//canvas.scale(1, -1, 100 + bmp.getWidth() / 2, 100 + bmp.getHeight() / 2);

//canvas.drawBitmap(bmp, 100, 100, paint);

//canvas.restore();

//----------镜像反转位图(方式2)

//X轴镜像

canvas.drawBitmap(bmp, 0, 0, paint);

Matrix maMiX = new Matrix();

maMiX.postTranslate(100, 100);

maMiX.postScale(-1, 1, 100 + bmp.getWidth() / 2, 100 + bmp.getHeight() / 2);

canvas.drawBitmap(bmp, maMiX, paint);

//Y轴镜像

canvas.drawBitmap(bmp, 0, 0, paint);

Matrix maMiY = new Matrix();

maMiY.postTranslate(100, 100);

maMiY.postScale(1, -1, 100 + bmp.getWidth() / 2, 100 + bmp.getHeight() / 2);

canvas.drawBitmap(bmp, maMiY, paint);

}

} catch (Exception e) {

// TODO: handle exception

} finally {

if (canvas != null)

sfh.unlockCanvasAndPost(canvas);

}