Lecture 8 Building an MDI Application

Transcription

1 Lecture 8 Building an MDI Application

2 Introduction The MDI (Multiple Document Interface) provides a way to display multiple (child) windows forms inside a single main(parent) windows form. In this example we will build an MDI application for image processing called... A brief overview of the features: Image Blaster 9000 Open and Save images of type -jpg, gif, and bmp Copy/Pase images from one child window to another. Incorporate an existing class of image filters. Apply various image manipulation filters e.g. grayscale, binary, posterize, erode, laplacian...

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4 using System; using System.Drawing; using System.Drawing.Imaging; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace ImageBlaster9000 public struct PixelData public byte blue; public byte green; public byte red; The Fast Image Processing Class - ImgPro The properties in this class make use of static memory byte-arrays to speed up pixel-level processing. These techniques are implemented in the PixelAt( ), LockBitmap( ), and UnlockBitmap( ) methods. The ImgPro Class is available on the course Web page. public unsafe class ImgPro Bitmap bitmap; int width; BitmapData bitmapdata = null; Byte* pbase = null; public ImgPro(Bitmap bitmap) this.bitmap = bitmap; public void Save(string filename) bitmap.save(filename, ImageFormat.Jpeg); public void Dispose() bitmap.dispose(); public Bitmap Bitmap get return (bitmap); public Point PixelSize get GraphicsUnit unit = GraphicsUnit.Pixel; RectangleF bounds = bitmap.getbounds(ref unit); return new Point((int)bounds.Width, (int)bounds.height); public void GrayScale() Point size = PixelSize; LockBitmap(); for (int x = 0; x < size.x; x++) for (int y = 0; y < size.y; y++) PixelData* ppixel = PixelAt(x, y); int value = (ppixel->red + ppixel->green + ppixel->blue) / 3; ppixel->red = (byte)value; ppixel->green = (byte)value; ppixel->blue = (byte)value; UnlockBitmap();

5 LockBitmap( ), PixelAt( ), and UnlockBitmap( ) public void LockBitmap() GraphicsUnit unit = GraphicsUnit.Pixel; RectangleF boundsf = bitmap.getbounds(ref unit); Rectangle bounds = new Rectangle((int)boundsF.X, (int)boundsf.y, (int)boundsf.width, (int)boundsf.height); width = (int)boundsf.width * sizeof(pixeldata); if (width % 4!= 0) width = 4 * (width / 4 + 1); bitmapdata = bitmap.lockbits(bounds, ImageLockMode.ReadWrite, PixelFormat.Format24bppRgb); pbase = (byte*)bitmapdata.scan0.topointer(); public PixelData* PixelAt(int x, int y) return (PixelData*)(pBase + y * width + x * sizeof(pixeldata)); public void UnlockBitmap() bitmap.unlockbits(bitmapdata); bitmapdata = null; pbase = null;

6 Permitting your Program to Run in Unsafe Mode open the Properties Page - not the Properties Window or Properties Panel or Properties Drop down Menu Item or...

7 Properties Page check the "All unsafe code" checkbox

8 public partial class FormMain : Form public int newindex = 0; public FormMain() InitializeComponent(); private void makenewmdichild() ImageBlaster9000.FormChild child = new ImageBlaster9000.FormChild(this); child.show(); this.activemdichild.text = "New-File-" + Convert.ToString(newindex); newindex += 1; private void newtoolstripmenuitem_click(object sender, EventArgs e) makenewmdichild(); private void openimage() int len; string filename = ""; OpenFileDialog dlg = new OpenFileDialog(); dlg.filter = "JPEG files (*.jpg) *.jpg GIF files (*.gif) *.gif Bitmap files (*.bmp) *.bmp"; if (dlg.showdialog() == DialogResult.OK) filename = dlg.filename; Bitmap img = new Bitmap(fileName); makenewmdichild(); FormChild activechild = this.activemdichild as FormChild; len = filename.length; if (len > 40) activechild.text = filename.substring(0, 35) + "..." + filename.substring(len - 4, 4); else activechild.text = filename; activechild.loadimage(filename); private void opentoolstripmenuitem_click(object sender, EventArgs e) openimage();

9 private void grayscaletoolstripmenuitem_click(object sender, EventArgs e) FormChild activechild = this.activemdichild as FormChild; if(activechild!= null) activechild.grayscale(); private void grayscaledemotoolstripmenuitem_click(object sender, EventArgs e) FormChild activechild = this.activemdichild as FormChild; if(activechild!= null) activechild.grayscaledemo();

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