/**
* This method is called when the model updates and has to move the ball. The logic to the
* reaction of the ball, if it intersects with other objects such as paddles and walls, is placed
* here.
*
* @param changeNo represents the ball has done if it intersects a paddle or the corner of a
* paddle etc... For definitions of what each integer represents see the model class.
*/
public void move(int changeNo) {
/*
* if statement added here because if dx and dy are originally set when
* the game is paused the AI knows where the ball will go before the game
* commences and will therefore move to that position
*/
if (dx == 0 || dy == 0) {
dx = randomDirection();
dy = randomDirection();
System.out.println("dx: " + dx + "\ndy: " + dy);
} // if
// if the ball touches the the top wall then change y direction.
if ((topLeftPoint.getY() > GameDimensions.FIELD_AMPLITUDE)
|| (bottomRightPoint.getY() <= GameDimensions.FIELD_AMPLITUDE * -1.0f)) dy = -dy;
if (isTouchingPaddle) {
if (!hasChangedDirection) {
// uses changeNo to decide how to react to the intersections
switch (changeNo) {
case 0:
dx = -1.1f * dx;
dy = -1.1f * dy;
break;
case 1:
dy = -1.05f * dy;
break;
case 2:
dx = -1.05f * dx;
default:
break;
} // switch
hasChangedDirection = true;
} // inner if
isTouchingPaddle = false;
} // outer if
else
/* This is always set to false to ensure that the first time the ball
* intersects the paddle, it hasn't changed direction and is does
* only once after the first point of intersection. */
hasChangedDirection = false;
// updates each of the ball co-ordinates after the ball has been moved.
topRightPoint.set((topRightPoint.getX() + dx), (topRightPoint.getY() + dy));
topLeftPoint.set((topLeftPoint.getX() + dx), (topLeftPoint.getY() + dy));
bottomLeftPoint.set((bottomLeftPoint.getX() + dx), (bottomLeftPoint.getY() + dy));
centrePoint.set((centrePoint.getX() + dx), (centrePoint.getY() + dy));
bottomRightPoint.set((bottomRightPoint.getX() + dx), (bottomRightPoint.getY() + dy));
// updates the ball image after it;s been moved
ballImage.setFrame(topLeftPoint.getX(), topLeftPoint.getY(), diameter, diameter);
} // move
/**
* This utility function makes it easy to check whether the coordinates of the user's mouse click
* (px,py) are on (or very close to) the ellipse defined by the bounding box with corners at
* (x1,y1) and (x2,y2).
*
* @param px x coordinate of mouse click
* @param py y coordinate of mouse click
* @param x1 x point of the first coordinate of object to check for mouse click proximity
* @param y1 y point of the first coordinate of object to check for mouse click proximity
* @param x2 x point of the second coordinate of object to check for mouse click proximity
* @param y2 y point of the second coordinate of object to check for mouse click proximity
* @return true if the coordinates of the user's mouse click (px,py) are on close to the ellipse
* defined by the bounding box with corners at (x1,y1) and (x2,y2).
*/
public static boolean clickHitEllipse(int px, int py, int x1, int y1, int x2, int y2) {
int minX = (x1 < x2 ? x1 : x2);
int minY = (y1 < y2 ? y1 : y2);
int maxX = (x1 > x2 ? x1 : x2);
int maxY = (y1 > y2 ? y1 : y2);
Ellipse2D.Float innerEllipse =
new Ellipse2D.Float(
minX + SELECTION_DISTANCE,
minY + SELECTION_DISTANCE,
maxX - minX - 2 * SELECTION_DISTANCE,
maxY - minY - 2 * SELECTION_DISTANCE);
Ellipse2D.Float outerEllipse =
new Ellipse2D.Float(
minX - SELECTION_DISTANCE,
minY - SELECTION_DISTANCE,
maxX - minX + 2 * SELECTION_DISTANCE,
maxY - minY + 2 * SELECTION_DISTANCE);
return outerEllipse.contains(px, py) && !innerEllipse.contains(px, py);
}
/** Moves the ball to the initial position */
public final void moveToInitialPosition() {
// set the ball stationary
dx = 0;
dy = 0;
/* sets the point references of the ball to the relevant points using the
* centre point as a guide */
/* centrePoint.set( (float)GameDimensions.X_DISTANCE_TO_FIELD_START
+ (GameDimensions.FIELD_WIDTH / 2),
(float)(GameDimensions.FIELD_HEIGHT / 2));*/
centrePoint.set(0.0f, 0.0f);
topRightPoint.set((centrePoint.getX() + radius), (centrePoint.getY() + radius));
topLeftPoint.set((centrePoint.getX() - radius), (centrePoint.getY() + radius));
bottomRightPoint.set((centrePoint.getX() + radius), (centrePoint.getY() - radius));
bottomLeftPoint.set((centrePoint.getX() - radius), (centrePoint.getY() - radius));
// sets the image of the ball
ballImage.setFrame(topLeftPoint.getX(), topLeftPoint.getY(), diameter, diameter);
} // moveInitialPosition
private void drawCircle(Graphics2D gr, Vec2 v, float size, Color color) {
circle.setFrame(v.x - size, v.y - size, size * 2, size * 2);
gr.setColor(color);
gr.draw(circle);
}
/** sets the bullet's location by taking in two floats */
public void setPosition(float x, float y) {
changedPosition.x = x;
changedPosition.y = y;
if (changedPosition.x > Game.width || changedPosition.y > Game.height) expired = true;
super.setFrame((double) x, (double) y, (double) size, (double) size);
}
protected void ellipseImpl(float x, float y, float w, float h) {
ellipse.setFrame(x, y, w, h);
drawShape(ellipse);
}
