C# 的高效缩放

发布于 2024-07-29 23:40:58 字数 479 浏览 19 评论 0原文

要放大和缩小图像，有一种可能的方法来调整图片框的大小并以拉伸模式显示图像。虽然我不能有效地使用它，因为一般超过 8 倍它会给出存储错误 [认为图片框的大小（32k，32k）它需要超过 1GB 内存！

是否有特殊方法，或者我应该使用 ImageClone 仅缩放图像的可见部分？

更新：

这是项目，首先尝试缩放项目[不可能，存储错误]，然后删除form.cs中的41行：

pictureBox1.Image = youPicture;

删除此行后，程序将运行，请移动缩放的图像。

这是链接： http://rapidshare.com/files/265835370/zoomMatrix.rar .html

原文

To zoom images in and out, there is a possible way to resize the pictureBox and showing image in strechmode. Although I can not use it efficiently becauce in general over 8x it gives storage error [think that a pictureBox has the Size(32k, 32k) it needs over 1GB memory !

Is there a special method, or should I zoom only the seen part of the image by using ImageClone ?

Update:

Here is the project at first try to zoom at the project [impossible, storage error] than delete the 41. line in form.cs :

pictureBox1.Image = youPicture;

After deleting this line, the program will work, please move the zoomed image.

Here is the link: http://rapidshare.com/files/265835370/zoomMatrix.rar.html

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如果没有 2024-08-05 23:40:58

通过使用矩阵对象和图形对象的变换属性：

using(Graphics g = this.CreateGraphics())
{
    using(Bitmap youPicture = new Bitmap(yourPictureFile))
    {
        g.DrawImage(youPicture, 0, 0, 300, 100); //set the desired size

        //Now you need to create a matrix object to apply transformation on your graphic
        Matrix mat = new Matrix();
        mat.Scale(1.5f, 1.5f, MatrixOrder.Append); //zoom to 150%
        g.Transform = mat;

        g.DrawImage(youPicture, new Rectangle(...), 0, 0, youPicture.Width,
            youPicture.Height, GraphicsUnit.Pixel) ;
    }
}

By using the matrix object and the transform property of your graphics object:

using(Graphics g = this.CreateGraphics())
{
    using(Bitmap youPicture = new Bitmap(yourPictureFile))
    {
        g.DrawImage(youPicture, 0, 0, 300, 100); //set the desired size

        //Now you need to create a matrix object to apply transformation on your graphic
        Matrix mat = new Matrix();
        mat.Scale(1.5f, 1.5f, MatrixOrder.Append); //zoom to 150%
        g.Transform = mat;

        g.DrawImage(youPicture, new Rectangle(...), 0, 0, youPicture.Width,
            youPicture.Height, GraphicsUnit.Pixel) ;
    }
}

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