UPDATED: Problem solved

I'm to create simple program where a ball is bouncing on the screen. Each corner should have a color and each time the ball hits a wall it should change to that sides color.

Very simpley yet I'm manage to get stuck

Right now the color of the ball only change at the moment it tuched the wall. But I want the ball to remain in the color of the wall. If I remover the corners I get the function I want. But then.. I have no corners. The problem lies in the "fill" I have to use to specify a color on the wall.

Is there anyway to draw the corners outside the "void draw?" Or are there any other solotion???

//----------------------------------- Gobal Settings
float PosX, PosY, Value1, Value2;
float xmover, ymover;
int ballsizex, ballsizey;

color bg = color(45,44,42,150);          
color sg = color(163,219,107,100);        
color dg = color(61,83,52,150);          
color bl = color(51,65,83,150);          
color re = color(140,35,24,150);          

void setup()
{
 size(400,300);
 PosX = 0;
 PosY = 0;
 Value1 = width/40;
 Value2 = height/30;
 xmover = 1;
 ymover = 2;
 ballsizex = width/20;
 ballsizey = height/15;

}
void draw()
{

 background(bg);
 smooth();
 noStroke();
 
 //----------------------------------- Ball

 ellipse(PosX+(Value1 + ballsizex), PosY+(Value2 + ballsizex), ballsizex, ballsizey);
 PosX = PosX + xmover;
 PosY = PosY + ymover;

 //----------------------------------- Bounce
 if(PosX  < 0  ||  PosX > width - (ballsizex*3)) {
   xmover = -xmover;
 }
 if(PosY  < 0  || PosY > height - (ballsizex*3)) {
   ymover = -ymover;
 }


//----------------------------------- Corners
 fill(sg);
 rect(0, ballsizex, ballsizex, height);
 fill(re);
 rect(0, 0, width, ballsizex);
 fill(bl);
 rect(width - ballsizex, 0 , width - ballsizex, height);
 fill(dg);
 rect(0, height - ballsizex, width, height - ballsizex);
 fill(0);

 //----------------------------------- Color change

 if (PosX == width - (ballsizex*3)) {
   fill(bl);
 }
 if (PosY == height - (ballsizex*3)) {
   fill(dg);
 }
 if(PosX == 0) {
   fill(sg);
 }
 if(PosY == 0) {
   fill(re);
 }

}

EDIT: Problem solved by using mover in the color script:

 if ((PosX > width - (ballsizex*5))  &&  xmover<0) {
   fill(bl);
 }
 if ((PosY > height - (ballsizex*5)) && ymover<0) {
   fill(dg);
 }
 if((PosX < (0+(ballsizex*2))) && xmover>0) {
   fill(sg);
 }
 if((PosY < (0+(ballsizex*2))) && ymover>0) {
   fill(re);
 }

Leave the answer here is my classmates happends to pass by