interactive_line_2_keys.pde

/*

Interactive Drawing Tool 2
Making Grass
john@johnkeefe.net
January 8, 2011

*/

int[] grassColor = { 0, 1, 0 }; // allows for green in the stroke() line 
float grassRandom; 

void setup() {
  size(500,500);
  background(255);
  smooth();
}

void draw() {
  // when mouse is pressed
  if(mousePressed) {
 
    for(int i = 0; i < 10; i++) {
      
      // randomizing the range of red, green or blue used
      // grassColor[] elements are 0 or 1 depending on keyPressd
      grassRandom = random(100,255);
      stroke(grassColor[0]*grassRandom, grassColor[1]*grassRandom, grassColor[2]*grassRandom); 
      
      // make fence line extending above mouse position
      // randomize the height of the blade mouseY-random(30,50)
      // randomize the angle of the blade mouseX+random(-10,10)
      line(mouseX,mouseY,mouseX+random(-10,10),mouseY-random(30,50)); 
    }
  }
}

void keyPressed() { 
 if(key  == 'c') {
   // clear the screen
   background(255);
 } else if(key == 'r') {
   // make the color red
   grassColor[0] = 1; // multiplier in the stroke() command is 1 for red
   grassColor[1] = grassColor[2] = 0;
 } else if(key == 'g') {
   grassColor[1] = 1; // multiplier in the stroke() command is 1 for green
   grassColor[0] = grassColor[2] = 0;
 } else if(key == 'b') {
   grassColor[2] = 1; // multiplier in the stroke() command is 1 for blue
   grassColor[0] = grassColor[1] = 0;
 } else if(key == 'p') {
   grassColor[0] = 0.5; // purple is 128,0,255 ... so this gets us that
   grassColor[1] = 0;
   grassColor[2] = 1;
 }
}