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/*
* Jesse Morgan <jesterpm@u.washington.edu>
*
* TCSS 305 - Autumn 2009
* Tetris Project
* 17 November 2009
*/
package tetris.gui.animations;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.image.BufferedImage;
import tetris.model.IntPoint;
/**
* Abstract class that processes animations.
*
* @author Jesse Morgan <jesterpm@u.washington.edu>
* @version 1.0 11 Dec 2009
*/
public abstract class Animation {
// Public Constants
/**
* How quickly animation should be updated.
*/
public static final int FRAME_RATE = 60;
// Private Constants
/**
* How much we show in each step.
*/
private static final int R = 5;
/**
* The current step in the animation.
*/
private int my_step;
/**
* The current position in the animation.
*/
private IntPoint my_current_pos;
/**
* Current Step Point.
*/
private IntPoint my_step_point;
/**
* Animation Running Flag.
*/
private boolean my_animation_running;
/**
* What the animation presently looks like.
*/
private final BufferedImage my_image;
/**
* What the animation will look like.
*/
private final Image my_end_image;
/**
* Create a new animation.
*
* @param the_end_image End result.
* @param the_width Animation width.
* @param the_height Animation height.
*/
public Animation(final Image the_end_image, final int the_width, final int the_height) {
my_step = 0;
my_animation_running = false;
my_current_pos = new IntPoint(0, 0);
my_step_point = new IntPoint(0, 0);
my_end_image = the_end_image;
my_image = new BufferedImage(the_width, the_height,
BufferedImage.TYPE_INT_ARGB);
}
/**
* Start the animation.
*/
public void start() {
my_step = 0;
my_current_pos = getStep(0);
my_step_point = getStep(0);
my_animation_running = true;
}
/**
* Stop the animation.
*/
public void stop() {
my_animation_running = false;
}
/**
* @return true if the animation is running.
*/
public boolean isRunning() {
return my_animation_running;
}
/**
* Draw the next increment of the animation.
*/
public void stepAnimation() {
// If we're near our destination, move to the next step.
if (
Math.abs(my_current_pos.getX() - my_step_point.getX()) < R &&
Math.abs(my_current_pos.getY() - my_step_point.getY()) < R
) {
// If we're out of steps, stop.
if (my_step >= stepCount() - 1) {
my_animation_running = false;
return;
}
my_step++;
my_step_point = getStep(my_step);
}
// Draw!
final Graphics2D g2d = my_image.createGraphics();
g2d.drawImage(my_end_image,
my_current_pos.getX(), my_current_pos.getY(),
my_current_pos.getX() + R, my_current_pos.getY() + R,
my_current_pos.getX() % my_end_image.getWidth(null),
my_current_pos.getY() % my_end_image.getHeight(null),
(my_current_pos.getX() + R) % my_end_image.getWidth(null),
(my_current_pos.getY() + R) % my_end_image.getHeight(null),
null);
// Some math to draw in the correct "direction"
final int x = my_step_point.getX() - my_current_pos.getX();
final int y = my_step_point.getY() - my_current_pos.getY();
double theta = Math.asin(y / Math.sqrt(x * x + y * y));
// Correction if we're moving toward the Y axis.
if (x < 0) {
theta = -theta + Math.PI;
}
// Calculate the next point
my_current_pos = new IntPoint((int) (my_current_pos.getX() + R * Math.cos(theta)),
(int) (my_current_pos.getY() + R * Math.sin(theta)));
}
/**
* @return the image of the current animation.
*/
public Image getImage() {
return my_image;
}
/**
* @return the current X in the animation.
*/
public int getX() {
return my_current_pos.getX();
}
/**
* @return the current Y in the animation.
*/
public int getY() {
return my_current_pos.getY();
}
/**
* Returns the point at the given step.
* @param the_step The Step.
* @return the Point.
*/
protected abstract IntPoint getStep(final int the_step);
/**
* @return the number of steps in the animation.
*/
protected abstract int stepCount();
}
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