Question

我想以角度绘制图像。我有一个ImageView具有竞争模式Aspect to fit。我还有一个dragView用户可以在View上移动和旋转。我用CGAffineTransformMakeRotation

移动了dragView

ImageView和dragView都添加在主（自我）视图中。

我已完成以下代码。

它有两个问题

我不知道如何以CGAffineTransformMakeRotation
dragView当前未放置在图像上。它在x和y位置有一些变化。

-(void)btnSaveClicked {

UIGraphicsBeginImageContextWithOptions(imgView.image.size, NO, 0.0); // create context as the image size
UIImage *dragImage = [self imageWithView:dragView]; // convert image from the dragView
[imgView.image drawInRect:CGRectMake(0, 0, imgView.image.size.width, imgView.image.size.height)];  // draw main image

CGSize size = imageDraw.size;
float factor = imgView.image.size.width / imgView.frame.size.width;
if (factor <  imgView.image.size.height / imgView.frame.size.height) {
    factor = imgView.image.size.height / imgView.frame.size.height;
}

CGRect rect = CGRectMake(self.view.frame.size.width/2-size.width/factor/2, self.view.frame.size.height/2-size.height/factor/2, size.width/factor, size.height/factor);

CGPoint point = CGPointMake((dragView.frame.origin.x+10-rect.origin.x)*factor,(dragView.frame.origin.y+10 - rect.origin.y)*factor);
[dragImage drawAtPoint:point blendMode:kCGBlendModeNormal alpha:1.0];  // draw the dragImnage but the point is wrong
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
imgView.image = newImage;

}

示例项目：https://github.com/SunnyShah407/WaterMark/tree/master

如何在IOS中以角度绘制图像

0 个答案: