IOS Quartz 各种绘制图形用法---实现画图片、写文字、画线、椭圆、矩形、棱形等

转自：http://blog.csdn.net/zhibudefeng/article/details/8463268

// Only override drawRect: if you perform custom drawing.
// An empty implementation adversely affects performance during animation.
- (void)drawRect:(CGRect)rect
{
    CGContextRef context = UIGraphicsGetCurrentContext();



    /*NO.1画一条线

     CGContextSetRGBStrokeColor(context, 0.5, 0.5, 0.5, 0.5);//线条颜色
     CGContextMoveToPoint(context, 20, 20);
     CGContextAddLineToPoint(context, 200,20);
     CGContextStrokePath(context);
    */



    /*NO.2写文字

    CGContextSetLineWidth(context, 1.0);
    CGContextSetRGBFillColor (context, 0.5, 0.5, 0.5, 0.5);
    UIFont  *font = [UIFont boldSystemFontOfSize:18.0];
    [@"公司：北京中软科技股份有限公司
部门：ERP事业部
姓名：McLiang" drawInRect:CGRectMake(20, 40, 280, 300) withFont:font];
    */


    /*NO.3画一个正方形图形 没有边框

    CGContextSetRGBFillColor(context, 0, 0.25, 0, 0.5);
    CGContextFillRect(context, CGRectMake(2, 2, 270, 270));
    CGContextStrokePath(context);
    */


    /*NO.4画正方形边框

    CGContextSetRGBStrokeColor(context, 0.5, 0.5, 0.5, 0.5);//线条颜色
    CGContextSetLineWidth(context, 2.0);
    CGContextAddRect(context, CGRectMake(2, 2, 270, 270));
    CGContextStrokePath(context);
    */


    /*NO.5画方形背景颜色

    CGContextTranslateCTM(context, 0.0f, self.bounds.size.height);
    CGContextScaleCTM(context, 1.0f, -1.0f);
    UIGraphicsPushContext(context);
    CGContextSetLineWidth(context,320);
    CGContextSetRGBStrokeColor(context, 250.0/255, 250.0/255, 210.0/255, 1.0);
    CGContextStrokeRect(context, CGRectMake(0, 0, 320, 460));
    UIGraphicsPopContext();
    */

    /*NO.6椭圆

     CGRect aRect= CGRectMake(80, 80, 160, 100);
     CGContextSetRGBStrokeColor(context, 0.6, 0.9, 0, 1.0);
     CGContextSetLineWidth(context, 3.0);
     CGContextAddEllipseInRect(context, aRect); //椭圆
     CGContextDrawPath(context, kCGPathStroke);
    */

    /*NO.7
    CGContextBeginPath(context);
    CGContextSetRGBStrokeColor(context, 0, 0, 1, 1);
    CGContextMoveToPoint(context, 100, 100);
    CGContextAddArcToPoint(context, 50, 100, 50, 150, 50);
    CGContextStrokePath(context);
    */

    /*NO.8渐变
    CGContextClip(context);
    CGColorSpaceRef rgb = CGColorSpaceCreateDeviceRGB();
    CGFloat colors[] =
    {
        204.0 / 255.0, 224.0 / 255.0, 244.0 / 255.0, 1.00,
        29.0 / 255.0, 156.0 / 255.0, 215.0 / 255.0, 1.00,
        0.0 / 255.0,  50.0 / 255.0, 126.0 / 255.0, 1.00,
    };
    CGGradientRef gradient = CGGradientCreateWithColorComponents
    (rgb, colors, NULL, sizeof(colors)/(sizeof(colors[0])*4));
    CGColorSpaceRelease(rgb);
    CGContextDrawLinearGradient(context, gradient,CGPointMake
                                (0.0,0.0) ,CGPointMake(0.0,self.frame.size.height),
                                kCGGradientDrawsBeforeStartLocation);
     */


    /* NO.9四条线画一个正方形
    //画线
        UIColor *aColor = [UIColor colorWithRed:0 green:1.0 blue:0 alpha:0];
    CGContextSetRGBStrokeColor(context, 1.0, 0, 0, 1.0);
       CGContextSetFillColorWithColor(context, aColor.CGColor);
    CGContextSetLineWidth(context, 4.0);
    CGPoint aPoints[5];
    aPoints[0] =CGPointMake(60, 60);
    aPoints[1] =CGPointMake(260, 60);
    aPoints[2] =CGPointMake(260, 300);
    aPoints[3] =CGPointMake(60, 300);
    aPoints[4] =CGPointMake(60, 60);
    CGContextAddLines(context, aPoints, 5);
    CGContextDrawPath(context, kCGPathStroke); //开始画线
     */



    /*  NO.10
    UIColor *aColor = [UIColor colorWithRed:0 green:1.0 blue:0 alpha:0];
    CGContextSetRGBStrokeColor(context, 1.0, 0, 0, 1.0);
    CGContextSetFillColorWithColor(context, aColor.CGColor);
    //椭圆
    CGRect aRect= CGRectMake(80, 80, 160, 100);
    CGContextSetRGBStrokeColor(context, 0.6, 0.9, 0, 1.0);
    CGContextSetLineWidth(context, 3.0);
      CGContextSetFillColorWithColor(context, aColor.CGColor);
       CGContextAddRect(context, rect); //矩形
    CGContextAddEllipseInRect(context, aRect); //椭圆
    CGContextDrawPath(context, kCGPathStroke);
     */



    /*  NO.11
     画一个实心的圆

     CGContextFillEllipseInRect(context, CGRectMake(95, 95, 100.0, 100));
    */



    /*NO.12
     画一个菱形
    CGContextSetLineWidth(context, 2.0);
    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);
    CGContextMoveToPoint(context, 100, 100);
    CGContextAddLineToPoint(context, 150, 150);
    CGContextAddLineToPoint(context, 100, 200);
    CGContextAddLineToPoint(context, 50, 150);
    CGContextAddLineToPoint(context, 100, 100);
    CGContextStrokePath(context);
     */

    /*NO.13 画矩形
    CGContextSetLineWidth(context, 2.0);

    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);

    CGRect rectangle = CGRectMake(60,170,200,80);

    CGContextAddRect(context, rectangle);

    CGContextStrokePath(context);
     */


    /*椭圆
    CGContextSetLineWidth(context, 2.0);

    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);

    CGRect rectangle = CGRectMake(60,170,200,80);

    CGContextAddEllipseInRect(context, rectangle);

    CGContextStrokePath(context);
     */

    /*用红色填充了一段路径:

    CGContextMoveToPoint(context, 100, 100);
    CGContextAddLineToPoint(context, 150, 150);
    CGContextAddLineToPoint(context, 100, 200);
    CGContextAddLineToPoint(context, 50, 150);
    CGContextAddLineToPoint(context, 100, 100);
    CGContextSetFillColorWithColor(context, [UIColor redColor].CGColor);
    CGContextFillPath(context);
    */

    /*填充一个蓝色边的红色矩形
    CGContextSetLineWidth(context, 2.0);
    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);
    CGRect rectangle = CGRectMake(60,170,200,80);
    CGContextAddRect(context, rectangle);
    CGContextStrokePath(context);
    CGContextSetFillColorWithColor(context, [UIColor redColor].CGColor);
    CGContextFillRect(context, rectangle);
    */

    /*画弧
     //弧线的是通过指定两个切点，还有角度，调用CGContextAddArcToPoint()绘制
    CGContextSetLineWidth(context, 2.0);
    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);
    CGContextMoveToPoint(context, 100, 100);
    CGContextAddArcToPoint(context, 100,200, 300,200, 100);
    CGContextStrokePath(context);
    */


    /*
    绘制贝兹曲线
    //贝兹曲线是通过移动一个起始点，然后通过两个控制点,还有一个中止点，调用CGContextAddCurveToPoint() 函数绘制
    CGContextSetLineWidth(context, 2.0);

    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);

    CGContextMoveToPoint(context, 10, 10);

    CGContextAddCurveToPoint(context, 0, 50, 300, 250, 300, 400);

    CGContextStrokePath(context);
     */

    /*绘制二次贝兹曲线

      CGContextSetLineWidth(context, 2.0);

      CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);

      CGContextMoveToPoint(context, 10, 200);

      CGContextAddQuadCurveToPoint(context, 150, 10, 300, 200);

      CGContextStrokePath(context);
     */

    /*绘制虚线
    CGContextSetLineWidth(context, 5.0);

    CGContextSetStrokeColorWithColor(context, [UIColor blueColor].CGColor);

    CGFloat dashArray[] = {2,6,4,2};

    CGContextSetLineDash(context, 3, dashArray, 4);//跳过3个再画虚线，所以刚开始有6-（3-2）=5个虚点

    CGContextMoveToPoint(context, 10, 200);

    CGContextAddQuadCurveToPoint(context, 150, 10, 300, 200);

    CGContextStrokePath(context);
    */
/*绘制图片
    NSString* imagePath = [[NSBundle mainBundle] pathForResource:@"dog" ofType:@"png"];
    UIImage* myImageObj = [[UIImage alloc] initWithContentsOfFile:imagePath];
    //[myImageObj drawAtPoint:CGPointMake(0, 0)];
    [myImageObj drawInRect:CGRectMake(0, 0, 320, 480)];

    NSString *s = @"我的小狗";

    [s drawAtPoint:CGPointMake(100, 0) withFont:[UIFont systemFontOfSize:34.0]];
*/

  /*
    NSString *path = [[NSBundle mainBundle] pathForResource:@"dog" ofType:@"png"];
    UIImage *img = [UIImage imageWithContentsOfFile:path];
    CGImageRef image = img.CGImage;
    CGContextSaveGState(context);
    CGRect touchRect = CGRectMake(0, 0, img.size.width, img.size.height);
    CGContextDrawImage(context, touchRect, image);
    CGContextRestoreGState(context);
   */


    /*NSString *path = [[NSBundle mainBundle] pathForResource:@"dog" ofType:@"png"];
    UIImage *img = [UIImage imageWithContentsOfFile:path];
    CGImageRef image = img.CGImage;
    CGContextSaveGState(context);

    CGContextRotateCTM(context, M_PI);
    CGContextTranslateCTM(context, -img.size.width, -img.size.height);

    CGRect touchRect = CGRectMake(0, 0, img.size.width, img.size.height);
    CGContextDrawImage(context, touchRect, image);
    CGContextRestoreGState(context);*/

/*
    NSString *path = [[NSBundle mainBundle] pathForResource:@"dog" ofType:@"png"];
    UIImage *img = [UIImage imageWithContentsOfFile:path];
    CGImageRef image = img.CGImage;

    CGContextSaveGState(context);

    CGAffineTransform myAffine = CGAffineTransformMakeRotation(M_PI);
    myAffine = CGAffineTransformTranslate(myAffine, -img.size.width, -img.size.height);
    CGContextConcatCTM(context, myAffine);

    CGContextRotateCTM(context, M_PI);
    CGContextTranslateCTM(context, -img.size.width, -img.size.height);

    CGRect touchRect = CGRectMake(0, 0, img.size.width, img.size.height);
    CGContextDrawImage(context, touchRect, image);
    CGContextRestoreGState(context);
*/
}