使用所选区域的矩形框裁剪图像？ [英] Crop an image using rectangular box of selected area?

问题描述

我在寻找一个很好的教程或示例代码，它将显示如何裁剪从iphone相机拍摄的图像

I am looking for a good tutorial or sample code, that would show how to crop an image taking from iphone camera

但你会用你的手指控制角落

but you would control the corners with your fingers

任何提示将是非常appericated，因为我尝试了很多方式，但没有得到一个结果。

any tip would be greatly appericated, as i tried in many way but didn't get a result.

推荐答案

按钮操作中的一些更改

-(IBAction) cropImage:(id) sender{


        // Create rectangle that represents a cropped image  
        // from the middle of the existing image

    float xCo,yCo;

    float width=bottomCornerPoint.x-topCornerPoint.x;

    float height=bottomCornerPoint.y-topCornerPoint.y;


    if(width<0)

    width=-width;


    if(height<0)

        height=-height;


    if(topCornerPoint.x <bottomCornerPoint.x)

    {

    xCo=topCornerPoint.x;

    }

    else 
    {
            xCo=bottomCornerPoint.x;
        }


        if(topCornerPoint.y <bottomCornerPoint.y)

    {

            yCo=topCornerPoint.y;

        }


    else {

            yCo=bottomCornerPoint.y;

        }


        CGRect rect = CGRectMake(xCo,yCo,width,height);

        // Create bitmap image from original image data,
        // using rectangle to specify desired crop area

        UIImage *image = [UIImage imageNamed:@"abc.png"];


        CGImageRef imageRef = CGImageCreateWithImageInRect([image CGImage], rect);

        UIImage *img = [UIImage imageWithCGImage:imageRef]; 

        CGImageRelease(imageRef);


        // Create and show the new image from bitmap data

        imageView = [[UIImageView alloc] initWithImage:img];

        [imageView setFrame:CGRectMake(110, 600, width, height)];

        imageView.image=img;

        [[self view] addSubview:imageView];

        [imageView release];



    }

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