Graphics.DrawLine(Pen,Point point1, Point point2) : Graphics « System.Drawing « C# / C Sharp by API

1. C# / C Sharp by API
2. System.Drawing
3. Graphics

Graphics.DrawLine(Pen,Point point1, Point point2)

   

using System;
using System.Drawing;
using System.Collections;
using System.ComponentModel;
using System.Windows.Forms;
using System.Data;

public class frmScribble : System.Windows.Forms.Form {
    private System.ComponentModel.Container components = null;
    private bool mouseDown = false;
    private Point lastPoint = Point.Empty;
    private string color = "black";
    private Graphics g;
    private Pen p;

    public frmScribble() {
        g = CreateGraphics();
        p = new Pen(Color.FromName(color));

    }
    protected override void OnMouseDown(MouseEventArgs e) {
        mouseDown = true;
        if (e.Button == MouseButtons.Right) {
            ContextMenu m = new ContextMenu();
            m.MenuItems.Add(0, new MenuItem("black", new EventHandler(RightMouseButton_Click)));
            m.MenuItems.Add(1, new MenuItem("white", new EventHandler(RightMouseButton_Click)));
            m.MenuItems.Add(2, new MenuItem("red", new EventHandler(RightMouseButton_Click)));
            m.MenuItems.Add(3, new MenuItem("green", new EventHandler(RightMouseButton_Click)));
            m.MenuItems.Add(4, new MenuItem("blue", new EventHandler(RightMouseButton_Click)));
            m.Show(this, new Point(e.X, e.Y));
        }
    }

    protected void RightMouseButton_Click(object sender, EventArgs e) {
        color = ((MenuItem)sender).Text;
        p = new Pen(Color.FromName(color));
    }

    protected override void OnMouseUp(MouseEventArgs e) {
        mouseDown = false;
    }

    protected override void OnMouseMove(MouseEventArgs e) {
        if (lastPoint.Equals(Point.Empty)) lastPoint = new Point(e.X, e.Y);
        if (mouseDown) {
            Point pMousePos = new Point(e.X, e.Y);
            g.DrawLine(p, pMousePos, lastPoint);
        }
        lastPoint = new Point(e.X, e.Y);
    }

    [STAThread]
    static void Main() {
        Application.Run(new frmScribble());
    }
}

   
    
    
  

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