Processing code: fill shapes with color, using fill() method

Example to fill shapes with color in Processing 2.0+, using fill() method:

fill shapes with color in Processing

int buttonA_x = 300;
int buttonA_y = 50;
int buttonA_width = 50;
int buttonA_height = 50;
int buttonA_colorR = 0xff;
int buttonA_colorG = 0x00;
int buttonA_colorB = 0x00;

int buttonB_x = 300;
int buttonB_y = 150;
int buttonB_width = 50;
int buttonB_height = 50;
int buttonB_r = 10;
int buttonB_color = 200;

int defaultColor = 150;

void setup() {  // setup() runs once
  size(400, 300);
  background(255);
}
 
void draw() {
  
  line(0, 0, width, height);
  
  fill(defaultColor);
  ellipse(width/2, height/2, 100, 100);
  
  fill(buttonA_colorR, buttonA_colorG, buttonA_colorB);
  rect(buttonA_x, buttonA_y, buttonA_width, buttonA_height);
  
  fill(buttonB_color);
  rect(buttonB_x, buttonB_y, buttonB_width, buttonB_height, buttonB_r);
}