Gravity with PGraphics

andresaraujo

I have a problem with creating gravity using a PGraphics as a floor. The PGraphics'll be drawn with the mouseX and mouseY position by clicking on the canvas.

I need that the ball walks over the drawn floor, and if there's no floor, it would fall down.

float x;
float y;
float gravity=.3;
float velocity = 0;
int caseM;
float counter;
PImage img;
boolean jump;

int xm= mouseX;
int ym  = mouseY;
int strokeW;
PGraphics pg;


void setup() {
  x=20;
  y=20;

  strokeW = 25;
  pg = createGraphics(1200, 700);


  jump=false;
  size(1200, 700);
}
void draw() {
  pg.beginDraw();
  pg.strokeWeight(strokeW);
  if (mousePressed) {
    pg.line(pmouseX, pmouseY, mouseX, mouseY);
  }
  pg.endDraw(); 
  image(pg, 0, 0);



  noStroke();
  fill(255, 0, 0);
  ellipseMode(CENTER);
  ellipse(x, y, 30, 30);
  ellipseMode(CORNER  );
  obstacles();
  jump();
}
void jump() {
  // println(contador);
  if (jump==true) {
    y-=5;
    counter++;
    velocity=0;
  }
  if (counter>20) {
    jump=false;
    counter=0;
  }
}
void obstacles() {
  color plat = pg.get ((int) (x), (int) y+20);
  color plat1 = pg.get ((int) (x-20), (int) y);
  color plat2 = pg.get ((int) (x+20), (int) y);
  println(plat, plat1, plat2);
  if (red(plat)!=0 && green(plat)!=0 && blue(plat)!= 0 && jump==false) {
    y = y +velocity;
    velocity = velocity + gravity;
  } 
  else {
  }
  if (red(plat1)!=0 && green(plat1)!=0 && blue(plat1)!= 0) {
    if (caseM==1) {
      x-=5;
    }
  } 
  else {
  }
  if (red(plat2)!=0 && green(plat2)!=0 && blue(plat2)!= 0) {
    if (caseM==2) {
      x+=5;
    }
  } 
  else {
  }
}
void keyPressed() {
  switch(keyCode) {
  case LEFT:
    caseM = 1;
    break;
  case RIGHT:
    caseM = 2;
    break;

  case UP:
    jump= true;

    break;
  }
}

void keyReleased() {
  caseM=0;
}