Question

我想加载一个图像（例如在面板中）并使用我拥有的函数弄乱picture_by的边缘，并通过单击按钮在图像上绘制边缘的线条。之后，我想绘制通过使用鼠标在同一图像上的额外线条。我还希望能够通过鼠标擦除绘制的线条，而不会在以后擦除图像。我不知道在每种情况下我应该使用哪个函数。一种方法可能是我用我的图像设置面板的backgroundImage并使用绘图函数通过鼠标绘制exta线_drawn。如果我使用这个方法，那么我应该使用函数通过单击按钮绘制edges_drawn行？有没有更好的办法？请指导我。谢谢。

Answer 1

见下面的代码..希望这会对你有帮助

Point startPoint = new Point();
bool dragging = false;

int testOne = 30;
int testTwo = 30;

private void pictureBox1_MouseMove(object sender, MouseEventArgs e)
{
    if (dragging)
    {
        int diffX = (pictureBox1.PointToClient(e.Location).X - startPoint.X);
        int diffY = (pictureBox1.PointToClient(e.Location).Y - startPoint.Y);

        label9.Text = diffX.ToString();   //Works, shows desired result
        label10.Text = diffY.ToString();  //also works fine

        testOne = (testOne + diffX); //Issue here
        testTwo = (testTwo + diffY); //and here

        label11.Text = (testOne).ToString(); //Unexpected results output
        label12.Text = (testTwo).ToString(); 
    }
}

private void pictureBox1_MouseDown(object sender, MouseEventArgs e)
{
    if (!dragging) //Incase the mouse down was repeating, it's not
    {
        startPoint = pictureBox1.PointToClient(e.Location);
        dragging = true;
    }
}

private void pictureBox1_MouseUp(object sender, MouseEventArgs e)
{
    if (dragging)
        dragging = false;
}

加载图像，通过单击按钮在其上绘制形状，通过鼠标在其上绘制线条

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