Linefield - OpenProcessing

mySketch
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const list = [
    { pitch: 1, length: 4, isRest: false},
    { pitch: 2, length: 4, isRest: false}, 
    { pitch: 3, length: 4, isRest: false},
    { pitch: 4, length: 4, isRest: false},
    { pitch: 3, length: 4, isRest: false}, 
    { pitch: 2, length: 4, isRest: false},
    { pitch: 1, length: 4, isRest: false},
    
    { pitch: 0, length: 4, isRest: true},
​
    //
    { pitch: 3, length: 4, isRest: false},
    { pitch: 4, length: 4, isRest: false},
    { pitch: 5, length: 4, isRest: false},
    { pitch: 6, length: 4, isRest: false},
    { pitch: 5, length: 4, isRest: false},
    { pitch: 4, length: 4, isRest: false},
    { pitch: 3, length: 4, isRest: false}, 
    
    { pitch: 0, length: 4, isRest: true},
​
    //
    { pitch: 1, length: 4, isRest: false},
    { pitch: 0, length: 4, isRest: true},
    { pitch: 1, length: 4, isRest: false},
    { pitch: 0, length: 4, isRest: true},
    { pitch: 1, length: 4, isRest: false},
    { pitch: 0, length: 4, isRest: true},
    { pitch: 1, length: 4, isRest: false},
    { pitch: 0, length: 4, isRest: true},
​
    //
    { pitch: 1, length: 4, isRest: false},
    { pitch: 2, length: 4, isRest: false}, 
    { pitch: 3, length: 4, isRest: false},
    { pitch: 4, length: 4, isRest: false},
    { pitch: 3, length: 4, isRest: false}, 
    { pitch: 2, length: 4, isRest: false},
    { pitch: 1, length: 4, isRest: false},
    
    { pitch: 0, length: 4, isRest: true},
​
];
​
const measure = 4;
​
function setup() {
    createCanvas(1112, 834);
    colorMode(HSB, int(list.length / measure), 100, 100, 100);
    noLoop();
    redraw();
}
​
function draw() {
​
    strokeCap(ROUND);
    randomSeed(1);
​
    const tileCount = list.length;
    const unitX = width / tileCount;
    const unitY = height / tileCount;
    const overLine = 2;
​
    for (let gridY = 0; gridY < tileCount; gridY++) {
        for (let gridX = 0; gridX < tileCount; gridX++) {
            
            let posX = unitX * gridX;
            let posY = unitY * gridY; 
​
            let groupYIndex = Math.floor(gridY / measure);
            stroke(groupYIndex, 50, 80, 60);
​
            let groupXIndex = Math.floor(gridX / measure);
            let noteIndex;
            if (groupYIndex == 0) {
                noteIndex = gridX;
            } else {
                noteIndex = (gridX + (groupYIndex * measure * 2)) % list.length;
            }
            let note = list[noteIndex];
            strokeWeight(note.pitch * 3);
​
            let patternType = int(random(0,2));
            if (patternType == 0) {                
                line(posX - overLine, posY - overLine, posX + unitX + overLine, posY + unitY + overLine);
            } else {
                line(posX - overLine, posY + unitY + overLine, posX + unitX + overLine, posY - overLine);
            }
​
        } 
    }
}
​
// save jpg
let lapse = 0;    // mouse timer
function mousePressed(){
  if (millis() - lapse > 400){
    save("img_" + month() + '-' + day() + '_' + hour() + '-' + minute() + '-' + second() + ".jpg"); 
    lapse = millis();
  } 
}
​