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Click the following links to download the required input files:
In this module, you learned how to darken, brighten, and tint the colors in a Picture object.
You will probably learn more than you already know about interfaces, arrays of type Object, etc., in the next module.
While not a requirement of the course, you can select the following links to view optional online video lectures on the material in thismodule.
This section contains a variety of miscellaneous information.
Financial : Although the Connexions site makes it possible for you to download a PDF file for thismodule at no charge, and also makes it possible for you to purchase a pre-printed version of the PDF file, you should beaware that some of the HTML elements in this module may not translate well into PDF.
I also want you to know that, I receive no financial compensation from the Connexions website even if you purchase the PDF version of the module.
In the past, unknown individuals have copied my modules from cnx.org, converted them to Kindle books, and placed them for sale on Amazon.com showing me as the author. I neither receive compensation for those sales nor do I know who doesreceive compensation. If you purchase such a book, please be aware that it is a copy of a module that is freelyavailable on cnx.org and that it was made and published without my prior knowledge.
Affiliation : I am a professor of Computer Information Technology at Austin Community College in Austin, TX.
A complete listing of the program discussed in this module is shown in Listing 10 below.
| Listing 10 . Complete program listing. |
|---|
/*File Prob04 Copyright 2008 R.G.Baldwin
*********************************************************/import java.awt.Color;
public class Prob04{public static void main(String[] args){Prob04Runner obj = new Prob04Runner();
obj.run();}//end main
}//end class Prob04//======================================================//
class Prob04Runner{public Prob04Runner(){//constructor
System.out.println("Display your name here.");}//end constructor
//----------------------------------------------------//public void run(){
Picture skater = new Picture("Prob04a.bmp");skater.explore();
skater = crop(skater,6,59,392,293);Picture hole = new Picture("Prob04b.bmp");
hole.explore();hole = crop(hole,6,59,392,293);
Picture snowScene = new Picture("Prob04c.jpg");snowScene.explore();
snowScene = crop(snowScene,6,59,392,293);//Make all the pixels darker in the snow scene except
// for those in the location of the hole. Make them// brighter.
darkenBackground(hole,snowScene);//Apply a red tint to the skater
redTint(skater);//Draw the skater on the snowScene.
greenScreenDraw(skater,snowScene,0,0);//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 the source has a pure green background.// Applies a red tint to every pixel that is not pure
// green.private void redTint(Picture pic){
Pixel[]pixels = pic.getPixels();
Color color = null;int red = 0;
int green = 0;int blue = 0;
for(int cnt = 0;cnt<pixels.length;cnt++){
color = pixels[cnt].getColor();
//Apply a red tint to all non-green pixelsif(!(color.equals(Color.GREEN))){
//Increase the value of the red componentred = color.getRed();
if(red*1.25<255){
red = (int)(red * 1.25);}else{
red = 255;}//end else
//Decrease the value of blue and greengreen = (int)(color.getGreen()*0.8);
blue = (int)(color.getBlue()*0.8);//Apply the new color to the pixel.
pixels[cnt].setColor(new Color(red,green,blue));
}//end if}//end for loop
}//end redTint//----------------------------------------------------//
//Assumes the pattern image has a pure green background.// Assumes that the pattern and the destination have the
// same dimensions. Darkens every pixel in the// destination that is at the location of a green pixel
// in the pattern. Applies a red tint to every pixel// in the destination that is at the location of a
// non-green pixel in the patternprivate void darkenBackground(
Picture pattern,Picture dest){
Pixel[]patternPixels = pattern.getPixels();
Pixel[]destPixels = dest.getPixels();
Color color = null;int red = 0;
int green = 0;int blue = 0;
for(int cnt = 0;cnt<patternPixels.length;cnt++){
color = patternPixels[cnt].getColor();
if(color.equals(Color.GREEN)){//Darken corresponding pixel in the destination.
color = destPixels[cnt].getColor();
destPixels[cnt].setColor(color.darker());
}else{//Apply a red tint to the corresponding pixel in
// the destination.color = destPixels[cnt].getColor();red = color.getRed();
if(red*1.25<255){
red = (int)(red * 1.25);}else{
red = 255;}//end else
green = (int)(color.getGreen() * 0.8);blue = (int)(color.getBlue() * 0.8);
destPixels[cnt].setColor(new Color(red,green,blue));
}//end else}//end for loop
}//end darkenBackground//----------------------------------------------------//
//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 JPEG images typically won't have
// a pure green background even if they had a pure// green background before being compressed into the
// JPEG 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 Prob04Runner |
-end-
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