Modify the Pacman animation from class to wrap around at the edges of the window: when it moves off the right-hand edge, it reappears at the left-hand edge, and vice versa, and when it moves off the top edge, it reappears at the bottom, and vice versa.
Write an animation in which a colored dot jumps around the screen randomly, every half second, not leaving a trace of its old locations. If the user clicks the mouse inside the dot, the animation ends. If the user clicks the mouse anywhere else, it has no effect.
Define a data class Candidate to represent a
candidate in an election, with two fields: the candidate's name and
the number of votes.
Provide a constructor that takes in values for the two
fields, a toString method, a same method,
and a getter for each field. Write a test class that creates several
instances of the class and calls the various methods on them.
Define a static method whoWon in this
class that takes in three Candidate parameters and returns
the name of the one with the most votes, or "tie" if there
was a tie for first place.
Note: this resembles a problem from homework 3, but rather than
assuming the first candidate is named "Anne", the second "Bob",
and the third "Charlie", it works on Candidates with
any names.
Add a method named addAVote to the
Candidate class:
it takes no parameters, and returns a new Candidate
with the same name and one more vote than before.
Write an animation like the one in problem 2, but keeping track of the elapsed time (in the top left corner of the screen) and the number of clicks (in the top right corner). You'll need to write a new data class for the model, and a new animation class. When the user clicks inside a dot, the final screen should show (appropriately labeled) how many seconds and how many clicks it took.
Write an animation in which a small picture moves with the mouse over a large fixed background picture, and every time the user clicks the mouse, a copy of the picture is left behind at the mouse location. Something like this (which was actually written in a different language, but it's the same exercise).
Define a data class named PlacedCircle which
represents a mathematical circle, with a radius and the location
of the center. As before, you should write a constructor, a
toString method, a same method, getters,
and a test class.
Note: this class has nothing to do with WorldImages;
it's just a mathematical construct.
Add a method area: it should take no parameters,
and return the area of the circle.
Add a method contains: it should take a Posn
parameter, and return a boolean indicating whether the Posn
is inside the circle.
Add a method overlaps to the PlacedCircle
class: it should take another PlacedCircle as a
parameter, and return a boolean indicating whether the two circles
overlap.
Write an animation of a dot that moves around the screen
at a constant velocity until it hits the top, bottom, left, or
right edge, at which point it "bounces off".
Hint: When you hit, say, the right-hand wall,
the x-coordinate of velocity should change, while the y-coordinate
of velocity shouldn't.
Hint: You may find it easier to break your tick
handler into three methods: one to move the dot, one to decide
whether it should bounce in the x dimension, and one to decide
whether it should bounce in the y dimension.
Add a "rocket" feature: if you press any of the arrow keys, the dot accelerates (changes velocity) in the specified direction.
Change the picture so it isn't just a dot, but rather a rocket-ship pointing in the direction that it's currently moving. (What should you do if it's not moving?)
Write an animation similar to the "typing" problem from homework 3, except that there's a vertical-bar cursor showing where you're currently typing. The left and right arrow keys move the cursor left and right (unless it's already at the beginning or end, respectively, of the string). Typing a letter key should insert it at the cursor location, and move the cursor to be after the new letter.
Write a painting program with a "palette" containing four colored panels down the left-hand side, and a "picture region", initially all white, filling the rest of the window. When you click on any of the colored panels, a dot of that color starts moving with the mouse, and when you click the mouse anywhere in the picture region, the dot is left there; then you can go on and add more dots of that color, or pick up a different color and add some different-colored dots.
Write an interesting animation whose model is a user-defined type. Go wild.