像缩放一样调整图片框的大小，没有它导致的滞后

Question

我制作了一种绘画程序，可以制作线条和图标，并在背面有一个图像将被绘制。我想使用滚轮缩放这张图片。

我发现的问题是，当我调整它的大小时，我发现在 100% 的大小上移动图标时完全没有延迟，但放大到 200% 时，例如它是延迟的。

什么是解决这个问题的聪明而正确的方法？

代码：

@ Scroll wheel
previousWidth = previousWidth * 1.25;
previousHeight = previousHeight * 1.25;
pictureBox1.Width = (int)previousWidth;
pictureBox1.Height = (int)previousHeight;
// the previous height is to avoid losing the 0.xxxx and so rescaling will
// not eventually end up in a 1 by 1 pixel image or too large.

array.zoomOut(); //makes the lines zoom properly with the picture
icon.zoomOut(); // makes the icons zoom properly with the picture

pictureBox1.Refresh();


// @ opening the file // 
file = System.Drawing.Image.FromFile(openFileDialog1.FileName);

pictureBox1.Image = file;
pictureBox1.Size = new System.Drawing.Size(file.Width, file.Height);
bitmap = new Bitmap(pictureBox1.Image);

pictureBox1.DrawToBitmap(bitmap, new System.Drawing.Rectangle(0, 0, pictureBox1.Width, pictureBox1.Height));

pictureLoaded = true;
previousWidth = pictureBox1.Width;
previousHeight = pictureBox1.Height;

Answer 1

你在做 WinForms 吗？当你说“滞后”时，你的意思是闪烁吗？

尝试将表单的属性DoubleBuffered 设置为True。就像提到的here。