any help is appreciated
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Programming Questions
•
1 year ago
class Ball {
/*
PLEASE NOTE THAT THE FOLLOWING DATA
MEMBER ' IS REQUIRED ONLY FOR
HD SUBMISSIONS AND SHOULD BE SET
TO diameter * 0.05 FOR THE METHOD
collideWith(Ball) TO WORK CORRECTLY
*/
float m;
//ADD YOUR CODE HERE
//You WILL need to implement a boolean checkCollisionWith(Ball other) method
//to correctly use collideWith method provided
/*
following method has been modified using the code from
Credit: Ira Greenberg, Keith Peter
DO NOT MODIFY THIS METHOD
*/
void collideWith(Ball other) {
PVector bVect = new PVector();
bVect.x = other.x - x;
bVect.y = other.y - y;
float bVectMag = sqrt(bVect.x * bVect.x + bVect.y * bVect.y);
if (checkCollisionWith(other)) {
// get angle of bVect
float theta = atan2(bVect.y, bVect.x);
// precalculate trig values
float sine = sin(theta);
float cosine = cos(theta);
Ball[] bTemp = {
new Ball(), new Ball()
};
/* b[1]'s position is relative to b[0]'s
so you can use the vector between them (bVect) as the
reference point in the rotation expressions.
bTemp[0].x and bTemp[0].y will initialize
automatically to 0.0, which is what you want
since b[1] will rotate around b[0] */
bTemp[1].x = cosine * bVect.x + sine * bVect.y;
bTemp[1].y = cosine * bVect.y - sine * bVect.x;
// rotate Temporary velocities
PVector[] vTemp = {
new PVector(), new PVector()
};
PVector[] v = {
new PVector(speedX, speedY),
new PVector(other.speedX, other.speedY)
};
vTemp[0].x = cosine * v[0].x + sine * v[0].y;
vTemp[0].y = cosine * v[0].y - sine * v[0].x;
vTemp[1].x = cosine * v[1].x + sine * v[1].y;
vTemp[1].y = cosine * v[1].y - sine * v[1].x;
/* Now that velocities are rotated, you can use 1D
conservation of momentum equations to calculate
the final velocity along the x-axis. */
PVector[] vFinal = {
new PVector(), new PVector()
};
// final rotated velocity for b[0]
vFinal[0].x = ((m - other.m) * vTemp[0].x + 2 * other.m *
vTemp[1].x) / (m + other.m);
vFinal[0].y = vTemp[0].y;
// final rotated velocity for b[0]
vFinal[1].x = ((other.m - m) * vTemp[1].x + 2 * m *
vTemp[0].x) / (m + other.m);
vFinal[1].y = vTemp[1].y;
// hack to avoid clumping
bTemp[0].x += vFinal[0].x;
bTemp[1].x += vFinal[1].x;
/* Rotate ball positions and velocities back
Reverse signs in trig expressions to rotate
in the opposite direction */
// rotate balls
Ball[] bFinal = {
new Ball(), new Ball()
};
bFinal[0].x = cosine * bTemp[0].x - sine * bTemp[0].y;
bFinal[0].y = cosine * bTemp[0].y + sine * bTemp[0].x;
bFinal[1].x = cosine * bTemp[1].x - sine * bTemp[1].y;
bFinal[1].y = cosine * bTemp[1].y + sine * bTemp[1].x;
// update balls to screen position
other.x = constrain(x + bFinal[1].x, other.diameter/2, width-other.diameter/2);
other.y = constrain(y + bFinal[1].y, other.diameter/2, height-other.diameter/2);
x = constrain(x + bFinal[0].x, diameter/2, width-diameter/2);
y = constrain(y + bFinal[0].y, diameter/2, height-diameter/2);
// update velocities
speedX = cosine * vFinal[0].x - sine * vFinal[0].y;
speedY = cosine * vFinal[0].y + sine * vFinal[0].x;
other.speedX = cosine * vFinal[1].x - sine * vFinal[1].y;
other.speedY = cosine * vFinal[1].y + sine * vFinal[1].x;
}
}
}
hello im trying to make a
boolean checkCollisionWith(Ball other) method
i finished my program but all i need is that boolean method and to combine the above code with my code but im having problems with the boolean method
the program is an example of a random number of balls between 5 and 20 bouncing on the sides of the window with random diameters between 20 and 80 with random colors and also fading in addition at first when we play the program non of the circles overlap over the other ( i finished all of these ) ..
my problem is combing the above code in order for the balls to bounce when they touch each other with my code and i have a problem to make a boolean checkCollisionWith(Ball other) methodd
any helpp ?
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