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A complete listing of the program discussed in this module is shown in Listing 6 below.
| Listing 6 . Complete program listing. |
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/*File Prob03 Copyright 2008 R.G.Baldwin
Revised 12/17/08*********************************************************/
import java.awt.Color;public class Prob03{
public static void main(String[]args){
Prob03Runner obj = new Prob03Runner();obj.run();
}//end main}//end class Prob03
//======================================================//class Prob03Runner{
public Prob03Runner(){//constructorSystem.out.println("Display your name here.");
}//end constructor//----------------------------------------------------//
public void run(){//Instantiate, display and crop the four input
// images. They must be cropped to remove the Alice// runtime window material. The three skater images
// are also cropped to remove excess blank green// background.
//Note that the three views of the skater are bmp// images instead of jpg images in order to preserve
// the pure green background color. Storing the// images as jpg files would corrupt the background
// color in the low order bits.//A view facing the front of the skater.
Picture front = new Picture("Prob03a.bmp");front.explore();
front = crop(front,123,59,110,256);//A view showing the right side of the skater.
Picture right = new Picture("Prob03b.bmp");right.explore();
right = crop(right,123,59,110,256);//A view showing the left side of the skater.
Picture left = new Picture("Prob03c.bmp");left.explore();
left = crop(left,123,59,110,256);//This will be the background for the new picture.
Picture snowScene = new Picture("Prob03d.jpg");snowScene.explore();
snowScene = crop(snowScene,6,59,344,256);//Draw the front view of the skater on the snowScene
// at full size.greenScreenDraw(front,snowScene,117,0);
//Draw the left side view of the skater on the// snowScene at half size.
left = left.getPictureWithHeight(256/2);greenScreenDraw(left,snowScene,55,64);
//Draw the right side view of the skater on the// snowScene at one-third size.
right = right.getPictureWithHeight(256/3);greenScreenDraw(right,snowScene,260,96);
//Display students name on the final output and// display it.
snowScene.addMessage("Display your name here.",10,15);snowScene.explore();
System.out.println(snowScene);}//end run method
//----------------------------------------------------////Assumes a source image with a pure green background.
// Copies all non-green pixels from the source image to// the destination image at the location explained
// below. Note that jpg images typically won't have// a pure green background even if they had a pure
// green background before being compressed into the// jpg format. bmp images work well for this.
private void greenScreenDraw(Picture source,
Picture dest,//Place the upper-left corner
// of the source image at the// following location in the
// destination image.int destX,
int destY){int width = source.getWidth();
int height = source.getHeight();Pixel pixel = null;
Color color = null;for(int row = 0;row<height;row++){
for(int col = 0;col<width;col++){
color = source.getPixel(col,row).getColor();if(!(color.equals(Color.GREEN))){
pixel = dest.getPixel(destX + col,destY + row);pixel.setColor(color);
}//end if}//end inner loop
}//end outer loop}//end greenScreenDraw
//----------------------------------------------------////Crops a Picture object to the given width and height
// with the upper-left corner located at startCol and// startRow.
private Picture crop(Picture pic,int startCol,int startRow,
int width,int height){
Picture output = new Picture(width,height);int colOut = 0;
int rowOut = 0;int col = 0;
int row = 0;Pixel pixel = null;
Color color = null;for(col = startCol;col<startCol+width;col++){
for(row = startRow;row<startRow+height;row++){
color = pic.getPixel(col,row).getColor();pixel = output.getPixel(colOut,rowOut);
pixel.setColor(color);rowOut++;
}//end inner looprowOut = 0;
colOut++;}//end outer loop
return output;}//end crop
}//end class Prob03Runner |
-end-
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