Quartz 实现画图片、写文字、画线、椭圆、矩形、棱形等。三

/*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);

*/