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create develop siteweb create develop siteweb *; import java.awt.*; public class Mondrian1 extends Applet { int height, width; public void init() { Dimension d = size(); height = d.height; width = d.width; repaint(); } public void paint(Graphics g) { g.

create develop siteweb drawRect(0, 0, width, height); }}Compile this applet; move the resulting class file to your classes directory, and create an HTML file that points to it. Set the height of the applet to 300 pixels and the width to 300 pixels as well. Load that file into your browser and what do you see? Probably not what you expected. You should see half a rectangle. What happened to the other half?This is called a fencepost error.

create develop siteweb The applet lives in a square 300 pixels tall by 300 pixels wide. However the upper left hand corner of the applet starts at (0, 0), not at (1, 1). This means that the applet includes the points with x and y coordinates between 0 and 299, not between 0 and 300. We drew a rectangle 301 pixels high and 301 pixels wide so the edges were chopped off.This is fortuitous however.

create develop siteweb Not only does it allow me the opportunity to digress on fencepost errors (which, although annoying, are far less dangerous in Java than in C since Java does check array boundaries) but it also shows us something else. In Java the coordinate system for an applet begins in the upper left hand corner and increases to the right and down. This is common in computer graphics but is different from the Cartesian coordinate system where the direction of increasing y is generally assumed to be up.Correcting the fence post error is easy. We just change g.

create develop siteweb

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create develop siteweb