hey i got this game and im having trouble with the code, anything will help.

Programming Questions

matscan

hey i got this game and im having trouble with the code, anything will help.

in Programming Questions • 11 months ago

So im trying to get the timer to appear and it wont, i have an image i uploaded that i made in "paint" for my backdrop, that comes up fine, but the car is slower than normal and you cant see the timer anymore ever since i made the background. I want the car to have to follow my backgound, a racetrack, and get to the end by the time 20 sec are up or you lose.
heres my code so far.

PFont font;
int timer=20;
int timeLast = 0;

PVector position, velocity;
float angle, steerAngle;

boolean[] keys = new boolean[256];

//
void setup() {

//
size(690, 645);
smooth();
timeLast=second();
font = loadFont("ARDESTINE-48.vlw");
textFont(font,48);


//
velocity = new PVector();
position = new PVector(width * 2.5, height * 2.5);

//
angle = 0.0;
steerAngle = 0.0;

}

//
void draw() {

if (timer>0){
    game();
}
}

void game(){
if (second()!=timeLast){
    timeLast=second();
    timer-=1;
}


//
background(timer*255,timer*255,0);
fill(0);
text("Timer: "+timer,320,50);
PImage img;
img = loadImage("racecartrack.jpg");
background(img);

//
PVector force = new PVector();

//
PVector vector1 = new PVector(sin(angle), cos(angle));
PVector vector2 = new PVector(vector1.y, - vector1.x);

//
float forwardVelocity = vector1.dot(velocity);
float sidewaysVelocity = vector2.dot(velocity);

//
steerAngle = 0.0;
float factor = constrain(forwardVelocity * 0.5, -1.5, 1.5);
if(keys[37]) {
    angle += 0.05 * factor;
    steerAngle = - PI * 0.20;
}
if(keys[39]) {
    angle -= 0.05 * factor;
    steerAngle = PI * 0.20;
}

//
force.add(PVector.mult(vector1, -forwardVelocity * 0.1));
if(keys[38]) {
    force.add(PVector.mult(vector1, 1.0));
}
if(keys[40]) {
    force.add(PVector.mult(vector1, -1.0));
}

//
float sidewaysFriction = - constrain(sidewaysVelocity * 10.0, -5.0, 5.0);
force.add(PVector.mult(vector2, sidewaysFriction));

//
force.div(7.5);
velocity.add(force);
position.add(velocity);

//
position.x = (position.x + width) % width;
position.y = (position.y + height) % height;

//
fill(100, 100);
noStroke();
rectMode(CENTER);
//
pushMatrix();
translate(position.x, position.y);
rotate(-angle);
rect(0, 0, 35, 75);
pushMatrix();
translate(10,17);
rotate(steerAngle);
rect(0, 5, 5, 10);
popMatrix();
pushMatrix();
translate(-10,17);
rotate(steerAngle);
rect(0, 5, 5, 10);
popMatrix();
pushMatrix();
translate(-10,-17);
rect(0, -5, 5, 10);
popMatrix();
pushMatrix();
translate(10,-17);
rect(0, -5, 5, 10);
popMatrix();
popMatrix();

}

//
void keyPressed() {keys[keyCode] = true;}
void keyReleased() {keys[keyCode] = false;}

Replies(3)

quarks

Re: hey i got this game and im having trouble with the code, anything will help.

11 months ago

The draw method is called about 60 times a second so it is not the place to loadImages this should be done in the setup method. Also the command background erases everything in the display so should only be used at the start of draw (or in your case game(). So I have made the changes in the code below but without the images I can't test it.

To make the car go faster you would need to experiment with the magnitude of the forces you are applying.

PFont font;
PImage img; // Image variable here
int timer=20;
int timeLast = 0;
PVector position, velocity;
float angle, steerAngle;
boolean[] keys = new boolean[256];
//
void setup() {
//
size(690, 645);
smooth();
timeLast=second();
font = loadFont("ARDESTINE-48.vlw");
textFont(font, 48);
// load images in setup
img = loadImage("racecartrack.jpg");
//
velocity = new PVector();
position = new PVector(width * 2.5, height * 2.5);
//
angle = 0.0;
steerAngle = 0.0;
}
//
void draw() {
if (timer>0) {
game();
}
}
void game() {
if (second()!=timeLast) {
timeLast=second();
timer-=1;
}
//
background(img);
fill(0);
text("Timer: "+timer, 320, 50);
//
PVector force = new PVector();
//
PVector vector1 = new PVector(sin(angle), cos(angle));
PVector vector2 = new PVector(vector1.y, - vector1.x);
//
float forwardVelocity = vector1.dot(velocity);
float sidewaysVelocity = vector2.dot(velocity);
//
steerAngle = 0.0;
float factor = constrain(forwardVelocity * 0.5, -1.5, 1.5);
if (keys[37]) {
angle += 0.05 * factor;
steerAngle = - PI * 0.20;
}
if (keys[39]) {
angle -= 0.05 * factor;
steerAngle = PI * 0.20;
}
//
force.add(PVector.mult(vector1, -forwardVelocity * 0.1));
if (keys[38]) {
force.add(PVector.mult(vector1, 1.0));
}
if (keys[40]) {
force.add(PVector.mult(vector1, -1.0));
}
//
float sidewaysFriction = - constrain(sidewaysVelocity * 10.0, -5.0, 5.0);
force.add(PVector.mult(vector2, sidewaysFriction));
//
force.div(7.5);
velocity.add(force);
position.add(velocity);
//
position.x = (position.x + width) % width;
position.y = (position.y + height) % height;
//
fill(100, 100);
noStroke();
rectMode(CENTER);
//
pushMatrix();
translate(position.x, position.y);
rotate(-angle);
rect(0, 0, 35, 75);
pushMatrix();
translate(10, 17);
rotate(steerAngle);
rect(0, 5, 5, 10);
popMatrix();
pushMatrix();
translate(-10, 17);
rotate(steerAngle);
rect(0, 5, 5, 10);
popMatrix();
pushMatrix();
translate(-10, -17);
rect(0, -5, 5, 10);
popMatrix();
pushMatrix();
translate(10, -17);
rect(0, -5, 5, 10);
popMatrix();
popMatrix();
}
//
void keyPressed() {
keys[keyCode] = true;
}
void keyReleased() {
keys[keyCode] = false;
}

matscan

Re: hey i got this game and im having trouble with the code, anything will help.

11 months ago

that worked flawlessly thanks alot! do you know if there is a way to code for how the car stays on the track? I want thee player to have to drive on the track all the way till the end of the track and if they get there in under 20 seconds they win, and if they dont they lose. Also where would i put in if statements for if lose and if win. for if win i want it to read win in text and if they lose i want it to read lose.

quarks

Re: hey i got this game and im having trouble with the code, anything will help.

11 months ago

do you know if there is a way to code for how the car stays on the track?

Since the direction and speed of the car is controlled by the player then I assume you mean 'how do I know if the car is still on the track or reached the end?'

Looking at the code I posted the position of the car is calculated in lines 77 & 78 and stored in variables position.x and position.y that being the case then there is a very simply solution. Make a copy of your background image then paint the whole image using just 3 colour

red - where the car position is off the track
green - when it is on the track
blue - when it has reached the finish

Then after you have calculated the position you can test the colour of the pixel on this image e.g.

position.x = (position.x + width) % width;
position.y = (position.y + height) % height;
// Get the colour from the mask image
int c = mask.get(position.x, position.y;
// Now test c for the color
if(c == color(255,0,0) { // red
state = 0;
}
else if (c == color(0,255,0) { // green
state = 1;
}
else if (c == color(0,0,255) { // blue
state = 2;
}

Add the variable mask and state at the begining of the program e.g.
PImage img, mask;
int state = 1; // Start with the car on the track
and load the image in setup()

Also where would i put in if statements for if lose and if win. for if win i want it to read win in text and if they lose i want it to read lose.

Modify this part of the program to

//
void draw() {
if (timer>0) {
game();
}
else {
state = 4; // out of time
}
}
void game() {
if (second()!=timeLast) {
timeLast=second();
timer-=1;
}
//
background(img);
fill(0);
text("Timer: "+timer, 320, 50);
//
switch(state){
case 0:
text("Crashed - you loose", 320, 70);
break;
case 2:
text("Finished - you win", 320, 70);
break;
case 4:
text("Out of time - you loose", 320, 70);
break;
}
PVector force = new PVector();

HTH

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