Due

Objectives

• to use the Graphics class
• to use selection statements

Assignment

All of the drawing is done by methods in the CalaverasCrossingPainter class. In particular, you will be writing code in the paintFrog, paintHome, paintTurtle, paintLog, paintTractor, paintCar, paintRacecar, and paintTruck methods. Each of those methods is passed four arguments: the Graphics object to use for drawing; the width and height of the area to draw in; and the game element that is being drawn. Check the code to see what identifiers are used for these values.

You should use the Graphics object to draw the game element. The Graphics object you use to draw has been translated so that no matter where the game element is on the screen, you should draw within the rectangle whose opposite corners are at (0, 0), and (width - 1, height - 1). Anything you draw outside this region will not show up on the screen. The Graphics object has also been rotated so that you should always draw the frog facing straight up and the obstacles moving towards the left.

You will have to use methods in the Frog, Turtle, and Home classes to determine how to draw instances of those classes. For example, the Home objects should be drawn differently when they are empty compared to when they are occupied by a frog. (Note that when a frog makes it home and then respawns at the bottom of the screen there is no longer a Frog object in the top row. It is therefore the responsibility of paintHome rather than paintFrog to draw the frogs that have made it home.) You will have to use the documentation to determine which methods to use.

Files

Advice

• Because the area you have to draw in is fairly small (each lane is about 60 pixels high by default), you shouldn't try to draw things too intricately.
• To make your drawings easier to see, you can switch the cases around for testing. For example, since the frog's jumps only last a fraction of a second, you can draw the frog as if it is jumping when it is really sitting.
• It can be difficult to see which shapes are not being drawn correctly when many of the same color overlap. You can temporarily change the color of each shape to determine which is not correct. For example, you can draw the frog's head blue and its body green.

Grading

• Correctness: 75%; for full credit you must
  • remove dead execution paths from your selection statements;
  • avoid repetitive code;
  • draw the frog, which should appear different when it is sitting compared to when it is jumping or dead;
  • draw the frog home bays in such a way so that the player can tell when a frog has already jumped into one;
  • draw the turtles, which should appear in at least four different ways: above water, just above water, just underwater, and underwater;
  • draw at least one of the other five kinds of objects; and
  • use at least three non-constant colors (colors other than Color.BLUE, etc.) including at least one obtained using the brighter or darker methods in the Color class and one created by passing RGB components to the Color constructor;
  • use at least three different Graphics methods;
  • draw to fill the area defined by the w and h arguments passed to the paintXXX methods; and
  • use layering.
• Comments and Style: 20% (you must make a good faith effort towards correctness to earn this part of the grade)
• Creativity: 5%

Submissions