Due

Objectives

• to instantiate objects
• to invoke methods
• to understand API documentation

Introduction

The goal of Calaveras Crossing is to navigate your frogs across the road and river into the niches at the top of the screen. Along the way, you must avoid getting your frogs squished in traffic or drowned in the river. The game ends when you have filled all five niches or killed three frogs.

Assignment

The Lane class represents a horizontal lane of traffic, whether it is road traffic or river traffic. The Level class represents the collection of lanes players navigate their frogs across. All of the other classes listed above represent the various obstacles the frog may encounter. Note that there are currenly no differences between Tractor, Car, and Racecar; you should use these classes for slow, medium, and fast small vehicles and we will make cosmetic changes in Project 3.

In general, to create a level you will instantiate several Lanes, instantiate various obstacles, add them to the lanes using the appropriate method, and then add the lane to the level using the appropriate method. Certain attributes of the obstacles and lanes (speed, width, etc.) can also be set, either by passing arguments to their constuctors when they are instantiated, or by invoking their methods.

Make sure the level you create meets the criteria listed below in the grading section.

Note that horizontal positions and widths are given in terms of the width of the screen: 1.0 for a width means as wide as the screen; 0.25 for a horizontal position means 1/4 of the way from the left edge to the right edge of the screen. The frog, for example, is 0.1 wide (1/10 of the screen).

Files

Your code to instantiate levels, lanes, and obstacles goes in CalaverasCrossingWindow.java. To play the game, compile and run that file.

There was a logic error in the original Frog class that prevented your frog from respawning when it floated off the edge of the screen. That error has been corrected. The current version of the archive has the corrected code. You can also download just the single file Frog.class (make sure to save it in the same directory as your other P2 files).

Advice

• As always, write your code incrementally. You might want to start with a single road lane with no vehicles. Then add vehicles one by one and set the velocity of the lane. Once you have written the proper code for one lane it will be easier to write the code to set up the other lanes.

Grading

• Correct and complete use of provided classes: 70%; for full credit you must do the following:
  • create at least 8 lanes that are not empty lanes of grass;
  • create at least one convoy of at least three vehicles following immediately after each other;
  • use groups of turtles of at least two different sizes;
  • use at least two groups of diving turtles, one with the default dive time and one with a different dive time;
  • use at least one row of evenly spaced logs;
  • use at least one row of unevenly spaced logs;
  • include lanes moving in both directions;
  • include at least one lane that is wider than the screen; and
  • include at least one lane that moves at the maximum speed.
• Creativity: 10%
• Comments and Style: 20% (you must make a good faith effort towards correctness to earn this part of the grade)
• Whistling: 0% (whistle Ino No Omawarisan while playing the game)

Submissions