# Exercise 54

## June 22, 2015 by Haig. Average Reading Time: about a minute.

``````
// P_2_1_3_02.pde
//
// Generative Gestaltung, ISBN: 978-3-87439-759-9
// First Edition, Hermann Schmidt, Mainz, 2009
// Hartmut Bohnacker, Benedikt Gross, Julia Laub, Claudius Lazzeroni
// Copyright 2009 Hartmut Bohnacker, Benedikt Gross, Julia Laub, Claudius Lazzeroni
//
// http://www.generative-gestaltung.de
/**
* draw a module made of lines in a grid
*
* MOUSE
* position x          : number of tiles horizontally
* position y          : number of tiles vertically
*
* KEYS
* 1-3                 : draw mode
* s                   : save png
* p                   : save pdf
*/

import processing.pdf.*;
import java.util.Calendar;

boolean savePDF = false;

float tileCountX = 5;
float tileCountY = 5;

int count = 10;
int colorStep = 20;

int lineWeight = 0;
int strokeColor = 0;

color backgroundColor = 0;

int drawMode = 1;

void setup() {
size(600, 600);
}

void draw() {
if (savePDF) beginRecord(PDF, timestamp()+".pdf");

colorMode(HSB, 360, 100, 100);
smooth();
strokeWeight(0.5);
strokeCap(ROUND);

tileCountX = mouseX/30+1;
tileCountY = mouseY/30+1;

background(backgroundColor);

for (int gridY=0; gridY<= tileCountY; gridY++) {
for (int gridX=0; gridX<= tileCountX; gridX++) {

float tileWidth = width/tileCountX;
float tileHeight = height/tileCountY;
float posX = tileWidth*gridX;
float posY = tileHeight*gridY;

float x1 = tileWidth/2;
float y1 = tileHeight/2;
float x2 = 0;
float y2 = 0;

pushMatrix();
translate(posX, posY);

for(int side = 0; side < 4; side++) {
for(int i=0; i< count; i++) {

// move end point around the four sides of the tile
if(side == 0){
x2 += tileWidth/count;
y2 = 0;
}
if(side == 1){
x2 = tileWidth;
y2 += tileHeight/count;
}
if(side == 2){
x2 -= tileWidth/count;
y2 = tileHeight;
}
if(side == 3){
x2 = 0;
y2 -= tileHeight/count;
}

// adjust weight and color of the line
if(i < count/2){
lineWeight += 1;
strokeColor += 60;
}
else {
lineWeight -= 1;
strokeColor -= 60;
}

// set colors depending on draw mode
switch(drawMode){
case 1:
backgroundColor = 360;
stroke(0);
break;
case 2:
backgroundColor = 360;
stroke(0);
strokeWeight(lineWeight);
break;
case 3:
backgroundColor = 0;
stroke(strokeColor);
strokeWeight(mouseX/100);
break;
}

// draw the line
line(x1, y1, x2, y2);
}
}

popMatrix();
}
}

if (savePDF) {
savePDF = false;
endRecord();
}
}

void keyPressed() {
if (key == 's' || key == 'S') saveFrame(timestamp()+"_##.png");
if (key == 'p' || key == 'P') savePDF = true;

if (key == '1') drawMode = 1;
if (key == '2') drawMode = 2;
if (key == '3') drawMode = 3;
}

// timestamp
String timestamp() {
Calendar now = Calendar.getInstance();
return String.format("%1\$ty%1\$tm%1\$td_%1\$tH%1\$tM%1\$tS", now);
}
``````