Question
(Help again) My main issue is that none of the functions (isColliding and handlemalletcollision) are called into the main code so it isn't doing anything.
(Help again) My main issue is that none of the functions (isColliding and handlemalletcollision) are called into the main code so it isn't doing anything. The functions are unused. They told me to add them into the main code for them to work but I'm unsure of how to do that, every time I mess around with it, my code breaks. Please help. This is a MATLAB code and please write out the full code and explain how and why you did what you did. THANK YOU. They said the main issue is in the collision part of the while loop.
My MATLAB code:
function air_hockey_rink()
% figure and axes
fig = figure('Name', 'Air Hockey', 'NumberTitle', 'off', 'KeyPressFcn', @keypress_callback);
ax = axes('XLim', [0, 100], 'YLim', [0, 50], 'Position', [0, 0, 1, 1]);
axis off; hold on; axis equal;
% rink definitions
rectangle('Position', [10, 5, 80, 40], 'EdgeColor', 'b', 'LineWidth', 2, 'FaceColor', 'w');
% middle line definition
line([50, 50], [5, 45], 'Color', 'k', 'LineWidth', 2);
% Circle in the middle of the rink
circleRadius = 5; % Set the radius of the circle
circleDiameter = circleRadius * 2;
circleX = 50 - circleRadius; % X position
circleY = 25 - circleRadius; % Y position
rectangle('Position', [circleX, circleY, circleDiameter, circleDiameter], 'Curvature', [1, 1], 'EdgeColor', 'k', 'LineWidth', 2);
% goal definitions
goalWidth = 12;
rectangle('Position', [10, 20, 3, goalWidth], 'EdgeColor', 'b', 'FaceColor', 'b');
rectangle('Position', [87, 20, 3, goalWidth], 'EdgeColor', 'r', 'FaceColor', 'r');
% mallets and puck
userMallet = rectangle('Position', [20, 25, 6, 6], 'Curvature', [1, 1], 'FaceColor', 'b');
oppMallet = rectangle('Position', [75, 25, 6, 6], 'Curvature', [1, 1], 'FaceColor', 'r');
puck = rectangle('Position', [47.5, 22.5, 5, 5], 'Curvature', [1, 1], 'FaceColor', [0.5, 0.5, 0.5]);
% scores
user_Score = 0;
opp_Score = 0;
% score board
scoreText = text(50, 2, 'Score: 0 - 0', 'HorizontalAlignment', 'center', 'FontSize', 14, 'FontWeight', 'bold');
% movement variables
malletSpeed = 2;
puckSpeed = [0, 0]; % initial speed in x and y directions
puckState = 'stationary'; % puck is still
% opponent movement
oppDirection = 1; % 1 for right, -1 for left
oppSpeed = 0.75; % speed of the opponent's mallet
% keypress_callback function
function keypress_callback(~, event)
switch event.Key
case 'leftarrow'
% prevent moving left beyond the left boundary
userMallet.Position(1) = max(userMallet.Position(1) - malletSpeed, 10);
case 'rightarrow'
% calculate the right boundary for the mallet
rightBoundary = 50 - userMallet.Position(3); % prevent from crossing middle line
newPosX = min(userMallet.Position(1) + malletSpeed, rightBoundary);
userMallet.Position(1) = newPosX;
case 'uparrow'
userMallet.Position(2) = min(userMallet.Position(2) + malletSpeed, 40);
case 'downarrow'
userMallet.Position(2) = max(userMallet.Position(2) - malletSpeed, 5);
end
end
% main game loop
while ishandle(fig)
% update puck position if it's 'moving'
if strcmp(puckState, 'moving')
puck.Position(1:2) = puck.Position(1:2) + puckSpeed;
end
% collision with walls
if puck.Position(1) <= 10 || puck.Position(1) >= 85
puckSpeed(1) = -puckSpeed(1);
end
if puck.Position(2) <= 5 || puck.Position(2) >= 40
puckSpeed(2) = -puckSpeed(2);
end
% move opponent mallet up and down
oppMallet.Position(2) = oppMallet.Position(2) + oppSpeed * oppDirection;
if oppMallet.Position(2) <= 5 || oppMallet.Position(2) >= 40
oppDirection = -oppDirection;
end
% collision with usermallet
if strcmp(puckState, 'moving') || strcmp(puckState, 'stationary')
if abs(puck.Position(1) - userMallet.Position(1)) < 5 && ...
abs(puck.Position(2) - userMallet.Position(2)) < 5
puckSpeed = [1,-1];
puckState = 'moving';
end
end
% collision with oppmallet
if abs(puck.Position(1) - oppMallet.Position(1)) < 5 && ...
abs(puck.Position(2) - oppMallet.Position(2)) < 5
% trigger a bounce off the opponent's mallet
puckSpeed = [-1, randi([-1,1])];
puckState = 'moving';
end
% goal detection
if puck.Position(1) <= 13 && puck.Position(2) > 20 && puck.Position(2) < 30
opp_Score = opp_Score + 1;
resetPuck();
elseif puck.Position(1) >= 82 && puck.Position(2) > 20 && puck.Position(2) < 30
user_Score = user_Score + 1;
resetPuck();
end
% update score display
scoreText.String = sprintf('Score: %d - %d', user_Score, opp_Score);
% pause
pause(0.03);
end
% reset puck
function resetPuck()
% place the puck in front of the user/opponent who was scored upon
if user_Score > opp_Score
% place the puck near the opponent
puck.Position = [75, 25, 5, 5];
else
% place the puck near the player
puck.Position = [25, 25, 5, 5];
end
puckSpeed = [0, 0]; % puck is still until hit by the mallet
puckState = 'stationary';
end
end
% collision detection function
function isColliding = isCollisionDetected(puck, mallet)
distance = sqrt((puck.position.x - mallet.position.x)^2 + (puck.position.y - mallet.position.y)^2);
isColliding = distance < (puck.radius + mallet.radius);
end
% handleMalletCollision function
function [newVp, newVb] = handleMalletCollision(puck, mallet)
% extract position and velocity components of puck and mallet
xp1 = puck.position.x;
yp1 = puck.position.y;
Vp1 = puck.velocity;
Vp1_mag = norm(Vp1);
xb1 = mallet.position.x;
yb1 = mallet.position.y;
Vb1 = mallet.velocity;
Vb1_mag = norm(Vb1);
rp = puck.radius; % puck radius
rb = mallet.radius; % mallet radius
% calculate angles for collision
theta = -atan2(yb1 - yp1, xb1 - xp1);
alpha = atan2(Vb1(2), Vb1(1));
beta = atan2(Vp1(2), Vp1(1));
% Remove any overlap between puck and blocker
xp2 = xb1 - (rp + rb) * cos(theta);
yp2 = yb1 + (rp + rb) * sin(theta);
% calculate normal and tangential components of velocity before collision
Vb1n = Vb1_mag * cos(theta + alpha);
Vb1s = Vb1_mag * sin(theta + alpha);
Vp1n = Vp1_mag * cos(theta + beta);
Vp1s = Vp1_mag * sin(theta + beta);
% masses of puck and mallet
mp = puck.mass;
mb = mallet.mass;
% total momentum and kinetic energy before the collision
P1n = mp * Vp1n + mb * Vb1n;
KE1 = 0.5 * mp * Vp1_mag^2 + 0.5 * mb * Vb1_mag^2;
% coefficients for the quadratic equation
a = mp^2 + mp * mb / mb;
b = -2 * P1n * mp / mb;
c = P1n^2 / mb + mp * Vp1s^2 + mb * Vb1s^2 - 2 * KE1;
% solve the quadratic equation for Vp2n
Vp2n = (-b - sqrt(b^2 - 4 * a * c)) / (2 * a);
% new velocity of the blocker in the normal direction
Vb2n = (P1n - mp * Vp2n) / mb;
% new velocities in the tangential direction
Vp2s = Vp1s;
Vb2s = Vb1s;
% calculate the final speeds and angles
Vp2_mag = sqrt(Vp2n^2 + Vp2s^2);
beta2 = atan2(Vp2s, Vp2n) - theta;
Vb2_mag = sqrt(Vb2n^2 + Vb2s^2);
alpha2 = atan2(Vb2s, Vb2n) - theta;
% convert back to x and y components
newVp = [Vp2_mag * cos(beta2), Vp2_mag * sin(beta2)];
newVb = [Vb2_mag * cos(alpha2), Vb2_mag * sin(alpha2)];
end
% reset puck position after a goal
function resetPuck()
puck.position.x = 50;
puck.position.y = 25;
puck.velocity = [0, 0];
end
I submitted this earlier but they didn't help me at all, please show how you integrated it INTO the while loop and not just fix the function itself. but also if there is an issue in the function please fix it.
Thank you
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