/**
* Moves the paddle left by the movement offset field within the picture window's bounds avoiding
* the given ball
*
* @param pict is the Picture object with the boundary to keep the paddle within
* @param ball is a ball that causes the paddle to move back if it's in the way
*/
public void moveLeft(JFrame pict, Ball ball) {
this.x -= this.offset; // Move x left by the offset
// Test to see if the paddle moved into the ball
if (ball.distance(this.x, this.y) < ball.getRadius()
|| ball.distance(this.x, this.y + this.height / 2) < ball.getRadius()
|| ball.distance(this.x, this.y + this.height) < ball.getRadius())
this.x += this.offset; // If so, move it out of the ball
// Test to see if the boundary was in the way to the left
if (this.x < 0) this.x = 0; // If so, set left of paddle to zero
}
/**
* Moves the paddle up by the movement offset field within the picture window's bounds avoiding
* the given ball
*
* @param pict is the Picture object with the boundary to keep the paddle within
* @param ball is a ball that causes the paddle to move back if it's in the way
*/
public void moveUp(JFrame pict, Ball ball) {
this.y -= this.offset; // Move y up by the offset
// Test to see if the paddle moved into the ball
if (ball.distance(this.x, this.y) < ball.getRadius()
|| ball.distance(this.x + this.width / 2, this.y) < ball.getRadius()
|| ball.distance(this.x + this.width, this.y) < ball.getRadius())
this.y += this.offset; // If so, move it out of the ball
// Test to see if the boundary was in the way above
if (this.y < 0) this.y = 0; // If so, set top of paddle to zero
}
/**
* Moves the paddle right by the movement offset field within the picture window's bounds avoiding
* the given ball
*
* @param pict is the Picture object with the boundary to keep the paddle within
* @param ball is a ball that causes the paddle to move back if it's in the way
*/
public void moveRight(JFrame pict, Ball ball) {
this.x += this.offset; // Move x right by the offset
// Test to see if the paddle moved into the ball
if (ball.distance(this.x + this.width, this.y) < ball.getRadius()
|| ball.distance(this.x + this.width, this.y + this.height / 2) < ball.getRadius()
|| ball.distance(this.x + this.width, this.y + this.height) < ball.getRadius())
this.x -= this.offset; // If so, move it out of the ball
// Test to see if the boundary was in the way on the right
if (this.x + this.width > pict.getWidth())
this.x = pict.getWidth() - this.width; // If so, set right to right edge
}
/**
* Moves the paddle down by the movement offset field within the picture window's bounds avoiding
* the given ball
*
* @param pict is the Picture object with the boundary to keep the paddle within
* @param ball is a ball that causes the paddle to move back if it's in the way
*/
public void moveDown(JFrame pict, Ball ball) {
this.y += this.offset; // Move y down by the offset
// Test to see if the paddle moved into the ball
if (ball.distance(this.x, this.y + this.height) < ball.getRadius()
|| ball.distance(this.x + this.width / 2, this.y + this.height) < ball.getRadius()
|| ball.distance(this.x + this.width, this.y + this.height) < ball.getRadius())
this.y -= this.offset; // If so, move it out of the ball
// Test to see if the boundary was in the way below
if (this.y + this.height > pict.getHeight())
this.y = pict.getHeight() - this.height; // If so, set bottom to picture bottom
}
/**
* Determines if the given ball has collided with the paddle and returns true if it has and false
* if it has not. If the ball has collided with the paddle the balls movement vectors are modified
* so the ball will bounce back at the proper angle.
*
* @param ball is the ball to examine to see if it has collided with the paddle
* @return Returns true if ball collides with paddle and if so updates vectors
*/
public boolean collision(Ball ball) {
// Temp variables for paddle corner coordinates;
int pX1 = this.x;
int pX2 = pX1 + this.width - 1;
int pY1 = this.y;
int pY2 = pY1 + this.height - 1;
// Temp variables for ball coordinates, movement vectors, and radius
int bX = ball.getX();
int bY = ball.getY();
int vX = ball.getXVector();
int vY = ball.getYVector();
int bRad = ball.getRadius();
// Testing for collisions with the paddle edges and the Ball
if (bX < pX1 && bY >= pY1 && bY <= pY2 && vX > 0) // left edge
{
if (bX + bRad > pX1) // will collide with edge
{
ball.setX(pX1 - bRad);
ball.setXVector(-Math.abs(vX)); // Change x direction
return true;
}
} else if (bX > pX2 && bY >= pY1 && bY <= pY2 && vX < 0) // right edge
{
if (bX - bRad < pX2) // will collide with edge
{
ball.setX(pX2 + bRad);
ball.setXVector(Math.abs(vX)); // Change x direction
return true;
}
} else if (bY < pY1 && bX >= pX1 && bX <= pX2 && vY > 0) // top edge
{
if (bY + bRad > pY1) // will collide with edge
{
ball.setY(pY1 - bRad);
ball.setYVector(-Math.abs(vY)); // Change y direction
return true;
}
} else if (bY > pY2 && bX >= pX1 && bX <= pX2 && vY < 0) // bottom edge
{
if (bY - bRad < pY2) // will collide with edge
{
ball.setY(pY2 + bRad);
ball.setYVector(Math.abs(vY)); // Change y direction
return true;
}
} else // Otherwise test to see if the ball hits a corner of the paddle
{
if (ball.distance(pX1, pY1) <= bRad
&& ball.distance(pX1, pY1) <= ball.distance(pX2, pY1)) { // top-left corner collision
if (Math.abs(pX1 - bX) >= Math.abs(pY1 - bY)) if (vX > 0) ball.setXVector(-vX);
if (Math.abs(pX1 - bX) <= Math.abs(pY1 - bY)) if (vY > 0) ball.setYVector(-vY);
return true;
} else if (ball.distance(pX2, pY1) <= bRad) { // top-right corner collision
if (Math.abs(pX2 - bX) >= Math.abs(pY1 - bY)) if (vX < 0) ball.setXVector(-vX);
if (Math.abs(pX2 - bX) <= Math.abs(pY1 - bY)) if (vY > 0) ball.setYVector(-vY);
return true;
} else if (ball.distance(pX2, pY2) <= bRad
&& ball.distance(pX2, pY2) <= ball.distance(pX1, pY2)) { // bottom-right corner collision
if (Math.abs(pX2 - bX) >= Math.abs(pY2 - bY)) if (vX < 0) ball.setXVector(-vX);
if (Math.abs(pX2 - bX) <= Math.abs(pY2 - bY)) if (vY < 0) ball.setYVector(-vY);
return true;
} else if (ball.distance(pX1, pY2) <= bRad) { // bottom-left corner collision
if (Math.abs(pX1 - bX) >= Math.abs(pY2 - bY)) if (vX > 0) ball.setXVector(-vX);
if (Math.abs(pX1 - bX) <= Math.abs(pY2 - bY)) if (vY < 0) ball.setYVector(-vY);
return true;
}
}
return false;
}