我正在尝试使用鼠标的位置来计算缩放图像的缩放因子。基本上,你离图像中心越远,它就越大;越靠近中心,它就越小。到目前为止我有一些代码,但它的行为真的很奇怪,我完全没有更多的想法。首先我要告诉你,我想做的一件事是平均 5 个距离以获得更平滑的调整大小动画。这是我的代码:
private void pictureBoxScale_MouseMove(object sender, MouseEventArgs e)
{
if (rotateScaleMode && isDraggingToScale)
{
// For Scaling
int sourceWidth = pictureBox1.Image.Width;
int sourceHeight = pictureBox1.Image.Height;
float dCurrCent = 0; // distance between the current mouse pos and the center of the image
float dPrevCent = 0; // distance between the previous mouse pos and the center of the image
System.Drawing.Point imgCenter = new System.Drawing.Point();
imgCenter.X = pictureBox1.Location.X + (sourceWidth / 2);
imgCenter.Y = pictureBox1.Location.Y + (sourceHeight / 2);
// Calculating the distance between the current mouse location and the center of the image
dCurrCent = (float)Math.Sqrt(Math.Pow(e.X - imgCenter.X, 2) + Math.Pow(e.Y - imgCenter.Y, 2));
// Calculating the distance between the previous mouse location and the center of the image
dPrevCent = (float)Math.Sqrt(Math.Pow(prevMouseLoc.X - imgCenter.X, 2) + Math.Pow(prevMouseLoc.Y - imgCenter.Y, 2));
if (smoothScaleCount < 5)
{
dCurrCentSmooth[smoothScaleCount] = dCurrCent;
dPrevCentSmooth[smoothScaleCount] = dPrevCent;
}
if (smoothScaleCount == 4)
{
float currCentSum = 0;
float prevCentSum = 0;
for (int i = 0; i < 4; i++)
{
currCentSum += dCurrCentSmooth[i];
}
for (int i = 0; i < 4; i++)
{
prevCentSum += dPrevCentSmooth[i];
}
float scaleAvg = (currCentSum / 5) / (prevCentSum / 5);
int destWidth = (int)(sourceWidth * scaleAvg);
int destHeight = (int)(sourceHeight * scaleAvg);
// If statement is for limiting the size of the image
if (destWidth > (currentRotatedImage.Width / 2) && destWidth < (currentRotatedImage.Width * 3) && destHeight > (currentRotatedImage.Height / 2) && destWidth < (currentRotatedImage.Width * 3))
{
AForge.Imaging.Filters.ResizeBilinear resizeFilter = new AForge.Imaging.Filters.ResizeBilinear(destWidth, destHeight);
pictureBox1.Image = resizeFilter.Apply((Bitmap)currentRotatedImage);
pictureBox1.Size = pictureBox1.Image.Size;
pictureBox1.Refresh();
}
smoothScaleCount = -1;
}
prevMouseLoc = e.Location;
currentScaledImage = pictureBox1.Image;
smoothScaleCount++;
}
}
编辑:感谢 Ben Voigt 和 Ray,现在一切正常。唯一的问题是,按照我的做法,图像并没有保持它的比例。但我稍后会解决这个问题。以下是我为那些想知道的人提供的:
private void pictureBoxScale_MouseMove(object sender, MouseEventArgs e)
{
if (rotateScaleMode && isDraggingToScale)
{
// For Scaling
int sourceWidth = pictureBox1.Image.Width;
int sourceHeight = pictureBox1.Image.Height;
int scale = e.X + p0.X; //p0 is the location of the mouse when the button first came down
int destWidth = (int)(sourceWidth + (scale/10)); //I divide it by 10 to make it slower
int destHeight = (int)(sourceHeight + (scale/10));
if (destWidth > 20 && destWidth < 1000 && destHeight > 20 && destWidth < 1000)
{
AForge.Imaging.Filters.ResizeBilinear resizeFilter = new AForge.Imaging.Filters.ResizeBilinear(destWidth, destHeight);
pictureBox1.Image = resizeFilter.Apply((Bitmap)currentRotatedImage);
pictureBox1.Size = pictureBox1.Image.Size;
pictureBox1.Refresh();
}
currentScaledImage = pictureBox1.Image; // This is only so I can rotate the scaled image in another part of my program
}
}