CMIS 102A

Lab


Download the Motion.java program from the class web site.

Modify it so that it uses a user-specified amount of time to delay
each iteration of the loop.  Use the sleep method incantation that we
used before:

try {
   Thread.sleep(sleepDelay);  //int variable.  pause in milliseconds
}
catch (InterruptedException e) {
}


Put a showStatus() in the loop to display the values of the x and y
variables.  showStatus method has one String parameter, which can be
built up using the + string concatenation operator.


Modify the program so the circle never goes outside the applet area.
Hint: check the x and y values.  If x < 0, set it back to 0
If x > getWidth(), set it back to getWidth()
similar for the y values...


Because the x and y are the oval's upper lefthand corner instead of
the center it will still drift off the right and bottom one circle's
width. Fix this by making x and y the center point of the circle and
offsetting them by the radius for fillOval's parameters:
fillOval(x-size/2, y-size/2, size, size)



Modify the program so that it changes color every so often (i.e. a user-
specified number of moves).  
Hint: "every so often" by modding the loop counter variable by the
number and seeing if that's 0:
if (i%N == 0)
  //do something every N loops

Change it to a random color using:
//1. declare a Color object and initialize it to red:
Color mycolor = Color.RED;

//2. assign a new random Color object:  
//(the 3 parameters are the red, green and blue (RGB) components that
//are the "primary colors" of each pixel of a monitor.  Each RGB
//component is a number from 0 to 255 that represents the intensity of
//that component, from off at 0 to full brightness at 255)
mycolor = new Color((int)(Math.random()*256),
                    (int)(Math.random()*256),
                    (int)(Math.random()*256));

//3. use the Color object to set the color:
g.setColor(myColor);



[Add sounds to program, say a different sound clip for each different
wall boundary that is touched, or differnet sounds for different
directions the circle moves in.]







Change your web site's index.html so that it has html, head, title and
body tags.  Don't forget the end tags. Include the bg attribute of the
body tag with a color that leaves links readable.