Mouse position problem

Programming Questions

akenfqs

in Programming Questions • 2 years ago

Hi !

I'm new with Processing and mostly with programing, I try to create an animation that I saw few month earlier on a website : you click somewhere, a circle begin to grow, then you click somewhere else, another circle begin to grow and when they meet, a sound is made.

So I started to type some code to make circles and sound, discovering Processing aswell, but I have a problem : when i specify coordinates to my circle, the circle follow the mouse... so i tried to specify the x;y in another way (like vars somewhere that grab mouseX and mouseY) but it seems to put the values to 0,0 because my circle appears on the top left corner.

I need some help :p

Here is the code :

import beads.*;
AudioContext ac;
float launch;
Cercle cercle1;
void setup() {
background(192, 64, 0);
size(400, 400);
ac = new AudioContext();
}
void draw() {
if (launch == 1) {
background(192, 64, 0);
cercle1.display();
cercle1.drive();
}
}
void mousePressed ()
{
cercle1 = new Cercle(1,1,0);
launch = 1;
WavePlayer wp = new WavePlayer(ac, (float)Math.random() * 500 + 100, Buffer.SINE);
Gain g = new Gain(ac, 1, new Envelope(ac, 0.1));
((Envelope)g.getGainEnvelope()).addSegment(0, 800, new KillTrigger(g));
g.addInput(wp);
ac.out.addInput(g);
ac.start();
}
class Cercle {
// data
float largeur;
float hauteur;
float swap;
// constructor
Cercle (float largeur, float hauteur, float swap){}
// fonctions
void display() {
ellipseMode(CENTER);
ellipse(mouseX,mouseY,largeur,hauteur);
}
void drive() {
if(largeur < 60)
{
if(swap == 0)
{
largeur++;
hauteur++;
}
else
{
largeur--;
hauteur--;
if(largeur == 1)
{ swap = 0; }
}
}
if(largeur == 60)
{
swap = 1;
largeur--;
hauteur--;
}
}
}

Replies(2)

tfguy44

Re: Mouse position problem

2 years ago

Well, it follows the mouse pointer because it's always drawn at the mouse pointer's position:

" ellipse(mouseX,mouseY,largeur,hauteur);"

You'll need to teach your circle class to be a little more smarter.

It's going to have to remember where it was when it was created.

It'll need additional //data to remember this position:

"float startX, startY;"
And it'll need to know to save those positions when it is created in the //constructor:

"{ startX = mouseX; startY = mouseY; }"

And then, of course, it'll need to use that information when it draws itself:

"ellipse(startX,startY,largeur,hauteur);"

akenfqs

Re: Mouse position problem

2 years ago

Thank you very much :D it works like that.

I was trying pretty much the same, but instead of writing { startX = mouseX; startY = mouseY; } i put the vars like that :

Cercle (float startX, startY, float largeur, float hauteur, float swap) and it didn't work.

I don't understand the exact role of what you put into the constructor and what is the difference between the { } and the ( ) in this case : I thought it was something like only designed to call "Cercle" by giving him vars to use so it was logical to me to call "Cercle" like this "cercle1 = new Cercle(mouseX, mouseY,1,1,0);" instead of doing { startX = mouseX; startY = mouseY; }

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