如何在WinForms PictureBox中从屏幕空间坐标转换为图像空间坐标?

我想这就是他们添加扩展方法的原因:)

在伪代码中:

// Recompute the image scaling the zoom mode uses to fit the image on screen
imageScale ::= min(pictureBox.width / image.width, pictureBox.height / image.height)

scaledWidth  ::= image.width * imageScale
scaledHeight ::= image.height * imageScale

// Compute the offset of the image to center it in the picture box
imageX ::= (pictureBox.width - scaledWidth) / 2
imageY ::= (pictureBox.height - scaledHeight) / 2

// Test the coordinate in the picture box against the image bounds
if pos.x < imageX or imageX + scaledWidth < pos.x then return null
if pos.y < imageY or imageY + scaledHeight < pos.y then return null

// Compute the normalized (0..1) coordinates in image space
u ::= (pos.x - imageX) / imageScale
v ::= (pos.y - imageY) / imageScale
return (u, v)

根据缩放比例,相对图像像素可以是多个像素中的任意位置。例如,如果图像被显著缩小,像素2,10可能代表2,10(一直到20,100),因此您必须自己进行计算,并对任何不准确之处承担全部责任!:-)