Dave Drohan (SETU)

Challenges

You may need to visit the Processing website for additional information.

Challenge 1

Create a new sketch called lab05_Challenge01.

Each target is produced when we press the mouse

Enter the following starting code into your sketch (you shouldn’t need to make any changes to these methods for this challenge):

void setup()
{
  size(400,400);
  noStroke();
}

void draw()
{
}

Write a mousePressed method that has one line of code in it. This line of code should be a call to the drawTarget method (you will write this next), passing the values 3 and 150 as actual parameters.

Now for the challenge…write a method called drawTarget that returns no data, but takes two paramters of type int.

The first parameter represents the number of circles in the target i.e. size.
The second parameter represents the starting grayscale colour i.e. gray

The only code in this method is a for loop. The loop will execute enough times to draw the number of circles required (determined by size).

This loop should set the fill to the value of gray.
Draw an ellipse at the current mouse coordinates with a diameter starting at 20 and increasing by 20 for each subsequent ellipse drawn.
Increase gray by 30.

Note: remember that the solution is available on the next tab, if you need to look at it.

Challenge 2

Now that you have the code drawing a target with 3 circles, test it so that you can easily draw targets with 6 circles etc. You should only need to change the actual parameter passed in the drawTarget method (and possibly the gray value variant).