Question

quartz 2d画图怎么设置线的宽度

Answer 1

/* 
     Quartz 2D 
     */  
    UIImage *image = [UIImage imageNamed: @"image.png"];  
    UIImageView *imageView = [[UIImageView alloc] initWithFrame: CGRectMake(0.0, 60, 320.0, 300)];  
      
    CGRect rect = CGRectMake(0, 60, 300, 300);  
    UIGraphicsBeginImageContext(rect.size);  
    CGContextRef currentContext = UIGraphicsGetCurrentContext();  
    CGContextClipToRect(currentContext, rect);  
      
      
    //180度  
    CGContextRotateCTM(currentContext, M_PI);  
    CGContextTranslateCTM(currentContext, -rect.size.width, -rect.size.height-100);  
      
      
    CGContextDrawImage(currentContext, rect, image.CGImage);  
      
    UIImage *cp = UIGraphicsGetImageFromCurrentImageContext();  
    UIGraphicsEndImageContext();  
      
    imageView.image = cp;  
      
      
    imageView.transform = CGAffineTransformIdentity;  
    imageView.transform = CGAffineTransformMakeScale(-1.0, 1.0);  
      
      
      
      
    [self.view addSubview: imageView];