我正在和我的朋友做一个C#项目。我们必须签名并将其保存到JPG文件中。我们不知道如何做到这一点,但至少我们正在努力。我们有两个问题:
1
绘制图形时,如果鼠标移动太快,则鼠标移动事件并非所有点都被捕获,结果图像是分离的点。我怎么能改善这个?
这是我的代码:
private void ingresoFirma_Load(object sender, EventArgs e)
{
myBrush = new SolidBrush(Color.Black);
myGraphics = panel1.CreateGraphics();
}
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
isDrawing = true;
}
private void panel1_MouseMove(object sender, MouseEventArgs e)
{
if (isDrawing)
{
myGraphics.FillEllipse(myBrush, e.X, e.Y, 10, 10);
}
}
private void panel1_MouseUp(object sender, MouseEventArgs e)
{
isDrawing = false;
}
第二个问题是我们不知道如何将图形保存为.jpg图像。我们使用了这样的东西:
private void saveSign_Click(object sender, EventArgs e)
{
Bitmap signature = new Bitmap(100,100,myGraphics);
signature.Save("c:\\myBitmap.bmp");
}
但它保存了一张空白图片。
答案 0 :(得分:1)
这是让你入门的东西......
public partial class ingresoFirma : Form
{
private List<Point> stroke = null;
private List<List<Point>> Strokes = new List<List<Point>>();
public ingresoFirma()
{
InitializeComponent();
}
private void panel1_MouseDown(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
stroke = new List<Point>();
stroke.Add(new Point(e.X, e.Y));
}
}
private void panel1_MouseMove(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
stroke.Add(new Point(e.X, e.Y));
if (stroke.Count == 2)
{
Strokes.Add(stroke);
}
panel1.Refresh();
}
}
private void panel1_MouseUp(object sender, MouseEventArgs e)
{
if (e.Button == System.Windows.Forms.MouseButtons.Left)
{
stroke = null;
}
}
private void panel1_Paint(object sender, PaintEventArgs e)
{
foreach(List<Point> curStroke in Strokes)
{
e.Graphics.DrawLines(Pens.Black, curStroke.ToArray());
}
}
private void btnClear_Click(object sender, EventArgs e)
{
Strokes.Clear();
panel1.Refresh();
}
private void btnSave_Click(object sender, EventArgs e)
{
SaveFileDialog sfd = new SaveFileDialog();
sfd.Filter = "JPG Files(*.JPG)|*.JPG";
if (sfd.ShowDialog() == System.Windows.Forms.DialogResult.OK)
{
Bitmap bmp = new Bitmap(panel1.Width, panel1.Height);
panel1.DrawToBitmap(bmp, panel1.ClientRectangle);
bmp.Save(sfd.FileName, System.Drawing.Imaging.ImageFormat.Jpeg);
}
}
}
答案 1 :(得分:0)
使用Control的DrawToBitmap()方法,您可以保存图像:
Bitmap theBitmap = new Bitmap(panel1.Width, panel1.Height)) ;
panel1.DrawToBitmap(theBitmap, new Rectangle(0, 0, bmp.Width, bmp.Height));
theBitmap.Save("c:\\myBitmap.bmp");