Hello to you all programmers ,

I am currently creating a little program that makes a fireball with a tail go around the screen and bouncing. Now I want to add cursors at the bottom to change the different characteristics of the ball : speed, size ... so I created a specific class, called Curs (for cursor), and the different values to be changed depend on its position.

I've tried with one so far : horizontal speed. Here is the problem : it's not visible . If you go the bottom left of the screen, imagine a button there and drag it along, the speed will be modified as it should (I ran a couple numerical values tests using the println() method), but the cursor is nowhere to be seen, nor the line that should represent the bar on which it slides. Any idea ? Thanks in advance !

Oh, and here's the code (if the error, which is probably quite stupid, is not here, give me your email and I'll send you the whole thing) :

//Boolean telling wether the mouse is dragged. It is set to true with mouseDragged and false with mouseReleased
boolean dragging = false;

//Creating the cursors and setting them depending on the already-existing values that they will later modify.
Curs cXspeed = new Curs(map(xspeed,-15,15,50,250),650,50, 250);

// The cursor class
class Curs {
    float xpos, ypos, xmin, xmax;
    float width = 300; // SInce the cursor is invisible, width is set to 300 to be easily dragged although not visible, for testing purposes
    boolean mouseOver = false;
    //The cursor takes in 4 values : its orignal x value, its y value (which will remain the same throughout, since it only slides left and right), and its x limits (how far it can be moved from left to right)
    Curs(float x, float y, float min, float max){
         xpos = x;
         ypos = y;
         xmin = min;
         xmax = max;
    }
    // The main method of the Curs class, ran every frame in draw()
    void update(){

         fill(0);
         stroke(0);
        // The one big if statement, that tells if the mouse is within the bounds of the cursor and if so, changes it's sides' color
         if((mouseX > (xpos-width/2)) && (mouseX < (xpos+width/2)) && (mouseY > (ypos-width/2)) && (mouseY < (ypos+width/2))){
              stroke(255);
              mouseOver = true;
               //println("updating...");
         }
         // Change the color if the mouse is pressed and over the cursor
         if(mouseOver && mousePressed){
              stroke(0);
              fill(255);
         }
         // Moves the cursor if the mouse is over it and dragged, but constrain its position between its x (left and right) limits
         if(mouseOver && dragging){
              xpos = constrain(mouseX, xmin, xmax);
         }
         // And finally, the cursor is drawn on top of its bar
         strokeWeight(3);
         line(xmin,ypos,xmax,ypos);
         strokeWeight(1);
         rectMode(CENTER);
         rect(xpos,ypos, width, width);
    }
}

//The method that checks for mouse dragging
void mouseDragged(){
    dragging = true;
}
// The method that checks for mouse releasing and sets "dragging" to false
void mouseReleased(){
    dragging = false;
}

//Function that updates the values depending on their corresponding cursor's position
void updateValues(){
    xspeed = map(cXspeed.xpos, cXspeed.xmin, cXspeed.xmax, 0, 15);
    if(backing){ //If, in its current direction, the fireball's speed is negative, and since the updated value is always positive, we need to set it to negative.
         xspeed = -xspeed;
    }
}

Alright thanks I'll give it a look . Anything else ?