Image Paint Simple Demo : Icon Image : Graphics C# Source Code

    

/*
Code revised from chapter 6


GDI+ Custom Controls with Visual C# 2005
By Iulian Serban, Dragos Brezoi, Tiberiu Radu, Adam Ward 

Language English
Paperback 272 pages [191mm x 235mm]
Release date July 2006
ISBN 1904811604

Sample chapter
http://www.packtpub.com/files/1604_CustomControls_SampleChapter.pdf


For More info on GDI+ Custom Control with Microsoft Visual C# book 
visit website www.packtpub.com 


*/ 
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Text;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;

namespace WarpControlApp1
{
    public partial class Form1 : Form
    {
        Image img = null;
        public Form1()
        {
            InitializeComponent();
        }
        private Image CreatePicture()
        {
            // Create a new Bitmap object, 50 x 50 pixels in size
            Image canvas = new Bitmap(50, 50);
            // create an object that will do the drawing operations
            Graphics artist = Graphics.FromImage(canvas);
            // draw a few shapes on the canvas picture
            artist.Clear(Color.Lime);
            artist.FillEllipse(Brushes.Red, 3, 30, 30, 30);
            artist.DrawBezier(new Pen(Color.Blue, 3), 0, 0, 40, 15, 10, 35, 50, 50);
            // now the drawing is done, we can discard the artist object
            artist.Dispose();
            //return the picture
            return canvas;
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            img = CreatePicture();
        }

        private void Form1_MouseUp(object sender, MouseEventArgs e)
        {
            Random rand = new Random(); // randomises our drawing parameters
            // set up all our parameters first before calling DrawWarpedPicture.
            Graphics target = this.CreateGraphics(); // draw onto the form's surface
            PointF pivotOnImage = new PointF(img.Width / 2, img.Height / 2);
            PointF pivotOnTarget = new PointF((Single)e.X, (Single)e.Y);
            double rotate = rand.NextDouble() * 360;
            double scaleFactor = 0.2 + (rand.NextDouble() * 2);
            SizeF skewing = new SizeF(rand.Next(-20, 21), rand.Next(-20, 21));
            // draw it!
            ImageWarper warper = new ImageWarper();
            warper.DrawWarpedPicture(target, img, pivotOnImage, pivotOnTarget, rotate, scaleFactor, skewing);

        }
        
        private System.ComponentModel.IContainer components = null;

        /// <summary>
        /// Clean up any resources being used.
        /// </summary>
        /// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
        protected override void Dispose(bool disposing)
        {
            if (disposing && (components != null))
            {
                components.Dispose();
            }
            base.Dispose(disposing);
        }

        #region Windows Form Designer generated code

        /// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {
            this.SuspendLayout();
            // 
            // Form1
            // 
            this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
            this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
            this.ClientSize = new System.Drawing.Size(292, 266);
            this.Name = "";
            this.Text = "Click the form to draw";
            this.MouseUp += new System.Windows.Forms.MouseEventHandler(this.Form1_MouseUp);
            this.Load += new System.EventHandler(this.Form1_Load);
            this.ResumeLayout(false);

        }

        #endregion
        
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new Form1());
        }

    }
public class ImageWarper : Component
{
    public void DrawWarpedPicture(
    Graphics surface,  // the surface to draw on
    Image img,         // the image to draw
    PointF sourceAxle, // pivot point passing through image.
    PointF destAxle,   // pivot point's position on destination surface
    double degrees,    // degrees through which the image is rotated clockwise
    double scale,      // size multiplier
    SizeF skew         // the slanting effect size, applies BEFORE scaling or rotation
    )
    {
        // give this array temporary coords that will be overwritten in the loop below
        // the skewing is done here orthogonally, before any trigonometry is applied
        PointF[] temp = new PointF[3] {  
              new PointF(skew.Width, -skew.Height),
              new PointF((img.Width - 1) + skew.Width, skew.Height),
              new PointF(-skew.Width,(img.Height - 1) - skew.Height) };
        double ang, dist;
        double radians = degrees * (Math.PI / 180);
        // convert the images corner points into scaled, rotated, skewed and translated points
        for (int i = 0; i < 3; i++)
        {
            // measure the angle to the image's corner and then add the rotation value to it
            ang = GetBearingRadians(sourceAxle, temp[i], out dist) + radians;
            dist *= scale; // scale
            temp[i] = new PointF((Single)((Math.Cos(ang) * dist) + destAxle.X), (Single)((Math.Sin(ang) * dist) + destAxle.Y));
        }
        surface.DrawImage(img, temp);
    }

    private double GetBearingRadians(PointF reference, PointF target, out double distance)
    {
        double dx = target.X - reference.X;
        double dy = target.Y - reference.Y;
        double result = Math.Atan2(dy, dx);
        distance = Math.Sqrt((dx * dx) + (dy * dy));
        if (result < 0)
            result += (Math.PI * 2); // add the negative number to 360 degrees to correct the atan2 value
        return result;
    }
}
    
}