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

 // 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\n部门：ERP事业部\n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);
 */
 }