pictureBox图像scalling [英] pictureBox image scalling

问题描述

我有一个绘制了pictureBox的代码，但是在绘制之后，该行将加载到pictureBox中的图像移位。我希望在整个时间内将图像加载到pictureBox中，然后才能正确缩放。例如图片3000x2000在800x600图片框中可见。



感谢您的帮助。



我有绘制线条的代码

I have a code that draws over pictureBox but after draw the line shifts the image loaded into pictureBox. I wish the image loaded in pictureBox whole time he was properly scaled. For example picture 3000x2000 visible in the 800x600 pictureBox.

Thank you for any help.

I have code to draw lines

private void pictureBox1_MouseClick(object sender, MouseEventArgs e)
       {
           pointArray[iNumberofClicks].X = e.X;
           pointArray[iNumberofClicks].Y = e.Y;
           Pen PenSpikes = new Pen(Color.Green);
           SolidBrush solidBrush = new SolidBrush(Color.Blue);
           iNumberofClicks++;

           if (iNumberofClicks > 1)
           {
               Point[] CurrentpointArray = new Point[iNumberofClicks];

               for (int i = 0; i < iNumberofClicks; i++)
               {
                   CurrentpointArray[i].X = pointArray[i].X;
                   CurrentpointArray[i].Y = pointArray[i].Y;
               }

               Bitmap canvas = new Bitmap(pictureBox1.Width, pictureBox1.Height);
               Graphics offScreenDC = Graphics.FromImage(canvas);

               // New line!
               offScreenDC.DrawImage(pictureBox1.Image, new Point());
               offScreenDC.DrawLines(PenSpikes, CurrentpointArray);
               pictureBox1.Image = canvas;
               offScreenDC.Dispose();
           }

       }

推荐答案

我认为你需要绘制一套通过点击它将点放在picture_Box上。您使用此代码执行的操作是，在鼠标单击时收集点集，将点集复制到局部数组，使用本地阵列绘制线创建图像，然后将图像设置为pictureBox1。 br />


我认为最好的方法就是在图片框的Paint事件中绘制线条。



更改鼠标事件如下。

I think you need to draw set of lines while you put points on a picture_Box by clicking on it. What you do with this code is, you collect the set of points as the mouse clicks, copy the set of points in to a local array, create an image with drawing lines with the local array and then set the image to the pictureBox1.

I think the best way is to do this is drawing lines with in the "Paint" event of the picture box.

change the mouse event as the follow.

private void pictureBox1_MouseClick(object sender, MouseEventArgs e)
{
    pointArray[iNumberofClicks].X = e.X;
    pointArray[iNumberofClicks].Y = e.Y;
    iNumberofClicks++;
    pictureBox1.Refresh();
}

//this is the registered paint event of the pictureBox1
private void pictureBox1_Paint(object sender, PaintEventArgs e)
{
    if(iNumberofClicks >1)
    {
        Pen PenSpikes = new Pen(Color.Green);
        Graphics g = e.Graphics;
        g.DrawLines(PenSpikes, pointArray);
    }
}

当你设置新点时，你可以看到新线。如果你需要放大绘图，你可以简单地将数组中点的x和y坐标乘以你需要的比例因子，然后调用pictureBox1.Refresh（）。

When ever you put a new point, you can see the new line. If you need to scale up the drawing you can simply multiply the x and y coordinates of the points in the array by the scale factor you need and then call pictureBox1.Refresh().

private void scaleDrawing(double factor)
{
    for (int i = 0; i < iNumberofClicks; i++)
    {
        pointArray[i].X = (int)pointArray[i].X*factor;
        pointArray[i].Y = (int)pointArray[i].Y*factor;
    }
    pictureBox1.Refresh();
}

这就是我理解你的问题的方法。请澄清我是否错了。

This is how I understand your question. Please clarify if I'm wrong.

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