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这是我的源代码。当我按下按钮移动鼠标时,我似乎无法获得位图显示面板上绘制的线条。沮丧和寻找某人来帮助我完成代码,所以我可以完成我的9岁女儿的应用程序。预先感谢您...C#绘图程序不会在屏幕上创建任何线条,因为我试图使用位图绘制
namespace TV_PAINT
{
public partial class ALANA_PAINT : Form
{
Graphics g;
Pen p = new Pen(Color.Black, 7);
Point sp = new Point(0, 0);
Point ep = new Point(0, 0);
int m = 0;
Bitmap BP;
public ALANA_PAINT()
{
InitializeComponent();
tb1.Text = p.Width.ToString();
BP = new Bitmap(pnl1.ClientSize.Width, pnl1.ClientSize.Height, System.Drawing.Imaging.PixelFormat.Format32bppArgb);
}
private void closeButton_Click(object sender, EventArgs e)
{
pnl1.Dispose();
p.Dispose();
this.Close();
}
private void clearButton_Click(object sender, EventArgs e)
{
//pnl1.Invalidate();
p.Color = System.Drawing.Color.Black;
p.Width = 7;
tb1.Text = p.Width.ToString();
//pnl1.Invalidate();
}
private void pnl1_MouseDown(object sender, MouseEventArgs e)
{
sp = e.Location;
if (e.Button == MouseButtons.Left)
m = 1;
if (e.Button == MouseButtons.Right)
m = 1;
}
private void pnl1_MouseMove(object sender, MouseEventArgs e)
{
if (m == 1)
{
ep = e.Location;
//g = pnl1.CreateGraphics();
Graphics g = Graphics.FromImage(BP);
g.DrawLine(p, sp, ep);
}
sp = ep;
}
private void pnl1_MouseUp(object sender, MouseEventArgs e)
{
m = 0;
}
谢谢你的回答。我试图制作一个绘图程序,当它从屏幕移出或其他东西放在它的顶部时,它不会清除面板。所以我被告知实现一个位图并绘制到位图而不是面板。我的下一个目标是能够将位图保存到一个文件,如果她想保存她制作的图片。希望这是有道理的... –
如果是这样,我认为你可以做这样的事情http://stackoverflow.com/questions/26936109/how-do-i-save-a-winforms-panels-drawing-content-to -a-file –
好的,再次感谢你。我正在阅读它... –