Create Color Grid

1// create-color-grid.jsx
2// Creates a grid of colored rectangles to demonstrate path creation,
3// color manipulation, and layer organization in Illustrator scripting.
4// Usage: Run from File > Scripts > Other Scripts in Adobe Illustrator.
5
6#target illustrator
7
8(function () {
9    var doc = app.documents.add();
10    var layer = doc.layers.add();
11    layer.name = "Color Grid";
12
13    var columns = 5;
14    var rows = 4;
15    var cellSize = 72;  // 1 inch
16    var gap = 10;
17    var startX = 72;
18    var startY = doc.height - 72;
19
20    for (var row = 0; row < rows; row++) {
21        for (var col = 0; col < columns; col++) {
22            var x = startX + col * (cellSize + gap);
23            var y = startY - row * (cellSize + gap);
24
25            var rect = layer.pathItems.rectangle(y, x, cellSize, cellSize);
26
27            var color = new RGBColor();
28            color.red = Math.round((col / (columns - 1)) * 255);
29            color.green = Math.round((row / (rows - 1)) * 255);
30            color.blue = Math.round(128 + Math.random() * 127);
31
32            rect.fillColor = color;
33            rect.stroked = false;
34        }
35    }
36
37    app.redraw();
38})();