Loops

Part 1: String of Squares

Make a window that is 200 by 200 with a white background. Set the frame rate to 15 frames per second. Starting at the mouseX and mouseY coordinates, draw a horizontal row of squares. Each square is 10 pixels by 10 pixels, and there are 10 pixels of space between the squares. Draw as many squares as will fit in the sketch window (i.e., don’t just draw 15 squares and let the edge of the window cut off the drawing). If your program works correctly, there will never be a partial square at the right side of the screen. You may make the squares any color you like. You must use a while loop for this program. Save this sketch with the name squares.

Extra credit: Use constrain() or an if statement to make sure that you never see a partial square at the bottom of the screen.

Part 2: X of Circles

Make a window that is 200 by 200 with a white background. Set the frame rate to 15 frames per second. Your program will draw an “X” made of circles, centered at (mouseX, mouseY), as shown in the diagram below at the left. Each square in the diagram represents ten pixels. The gray circle represents the mouse position. In your program, make all the circles the same color (white is a reasonable choice). You must may use either a while loop or a for loop for this program. Save this sketch with the name circles.

Extra challenge: change the color of each the circles to a random color when the mouse moves. If the mouse doesn’t move, the circles all stay the same color. Use an if statement to make this happen.

Part 3: Creative Exercise—The Alańeðian Flag

The government of the fictional country of Alańeðia has hired you to design its new flag. Here are their requirements.

• The flag must have at least two sets of repeating elements. (For example, the U.S. flag has stars and stripes as its repeating elements.)
• You must use a for or while loop to draw each of the repeating elements.
• The flag must be wider than it is tall.
• The minimum height of your sketch must be 250 pixels.
• The left side of the flag must be a straight line; otherwise, it couldn’t be attached to a flagpole. That means your flag cannot be a circle or an ellipse. (However, the flag does not have to be a rectangle.)
• The interior of the flag must use at least three of these colors: black, white, blue, yellow, green, and red.
• Your flag must not be a duplicate of any existing country’s flag; the Alańeðians don’t want to cause an international incident.

Save your sketch in a file named flag.

When You Finish

Zip up all the sketches into a zip file named loops.zip and upload it.