randomise.js
Area: Transform
Randomises the position, rotation, scale, and opacity of each selected object within the chosen ranges. A seeded splitmix32 PRNG drives the pattern and Reshuffle picks a new seed; transforms go through createTransform and opacity through createSetOpacity. Previews live.
Source: randomise.js
Example scripts
randomise.js
randomise.js
/*
BSD 3-Clause License
Copyright (c) 2026, Canva Pty Ltd.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:
Redistributions of source code must retain the above copyright notice, this
list of conditions and the following disclaimer.
Redistributions in binary form must reproduce the above copyright notice,
this list of conditions and the following disclaimer in the documentation
and/or other materials provided with the distribution.
Neither the name of the copyright holder nor the names of its
contributors may be used to endorse or promote products derived from
this software without specific prior written permission.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
'use strict';
// Randomises the position, rotation, scale and opacity of each selected object within the
// chosen ranges. Reshuffle picks a new random pattern. Previews live.
const { CompoundCommandBuilder, DocumentCommand } = require('/commands.js');
const { Dialog, DialogResult } = require('/dialog.js');
const { Document } = require('/document.js');
const { Transform } = require('/geometry.js');
const { Selection } = require('/selections.js');
const { UnitType } = require('/units.js');
function isOk(result) {
return (result?.value ?? result) == DialogResult.Ok.value;
}
function compound(cmds) {
if (cmds.length == 0)
return null;
const builder = CompoundCommandBuilder.create();
for (const cmd of cmds)
builder.addCommand(cmd);
return builder.createCommand();
}
function previewLoop(doc, dlg, build, onCommit) {
const update = (preview) => {
const cmd = build();
if (cmd)
doc.executeCommand(cmd, preview);
else
doc.clearPreviews();
return cmd;
};
dlg.onControlValueChangedHandler = () => update(true);
update(true);
if (isOk(dlg.runModal())) {
const cmd = update(false);
if (cmd && onCommit)
onCommit(cmd);
}
doc.clearPreviews();
}
function splitmix32(a) {
return function() {
a |= 0;
a = a + 0x9e3779b9 | 0;
let t = a ^ a >>> 16;
t = Math.imul(t, 0x21f0aaad);
t = t ^ t >>> 15;
t = Math.imul(t, 0x735a2d97);
return ((t = t ^ t >>> 15) >>> 0) / 4294967296;
};
}
function aboutCentre(cx, cy, dx, dy, radians, scale) {
return Transform.createTranslate(cx + dx, cy + dy)
.multiply(Transform.createRotate(radians))
.multiply(Transform.createScale(scale, scale))
.multiply(Transform.createTranslate(-cx, -cy));
}
function createRandomiseCommand(doc, sources, opts) {
const prng = splitmix32(opts.seed);
const spread = (range) => (prng() * 2 - 1) * range;
const cmds = [];
for (const { node, centre } of sources) {
const sel = Selection.create(doc, node);
const dx = opts.position ? spread(opts.rangeX) : 0;
const dy = opts.position ? spread(opts.rangeY) : 0;
const rot = opts.rotation ? spread(opts.rangeRotation) * Math.PI / 180 : 0;
const scale = opts.scale ? 1 + spread(opts.rangeScale) / 100 : 1;
if (dx || dy || rot || scale != 1)
cmds.push(DocumentCommand.createTransform(sel, aboutCentre(centre.x, centre.y, dx, dy, rot, Math.max(0.01, scale))));
if (opts.opacity)
cmds.push(DocumentCommand.createSetOpacity(sel, (opts.opacityMin + prng() * (opts.opacityMax - opts.opacityMin)) / 100));
}
return compound(cmds);
}
function enableBy(toggle, controls) {
const update = () => controls.forEach(c => c.isEnabled = toggle.value);
toggle.onValueChangedHandler = update;
update();
}
function buildDialog(doc) {
const pt = doc.dpi / 72;
const dlg = Dialog.create("Randomise");
const col = dlg.addColumn();
const pos = col.addGroup("Position");
dlg.position = pos.addSwitch("Enabled", true);
dlg.rangeX = pos.addUnitValueEditor("Horizontal ±", UnitType.Pixel, doc.units, 20 * pt, 0);
dlg.rangeY = pos.addUnitValueEditor("Vertical ±", UnitType.Pixel, doc.units, 20 * pt, 0);
enableBy(dlg.position, [dlg.rangeX, dlg.rangeY]);
const rot = col.addGroup("Rotation");
dlg.rotation = rot.addSwitch("Enabled", true);
dlg.rangeRotation = rot.addUnitValueEditor("Degrees ±", UnitType.Number, UnitType.Number, 15, 0, 180).setPrecision(1);
enableBy(dlg.rotation, [dlg.rangeRotation]);
const scale = col.addGroup("Scale");
dlg.scale = scale.addSwitch("Enabled", false);
dlg.rangeScale = scale.addUnitValueEditor("Percent ±", UnitType.Number, UnitType.Number, 20, 0, 99).setPrecision(0);
enableBy(dlg.scale, [dlg.rangeScale]);
const opacity = col.addGroup("Opacity");
dlg.opacity = opacity.addSwitch("Enabled", false);
dlg.opacityMin = opacity.addUnitValueEditor("Minimum %", UnitType.Number, UnitType.Number, 40, 0, 100).setPrecision(0);
dlg.opacityMax = opacity.addUnitValueEditor("Maximum %", UnitType.Number, UnitType.Number, 100, 0, 100).setPrecision(0);
enableBy(dlg.opacity, [dlg.opacityMin, dlg.opacityMax]);
dlg.seed = 1;
dlg.reshuffle = col.addGroup("").addButton("Reshuffle").setIsFullWidth();
return dlg;
}
function readOptions(dlg) {
return {
seed: dlg.seed,
position: dlg.position.value, rangeX: dlg.rangeX.value, rangeY: dlg.rangeY.value,
rotation: dlg.rotation.value, rangeRotation: dlg.rangeRotation.value,
scale: dlg.scale.value, rangeScale: dlg.rangeScale.value,
opacity: dlg.opacity.value,
opacityMin: Math.min(dlg.opacityMin.value, dlg.opacityMax.value),
opacityMax: Math.max(dlg.opacityMin.value, dlg.opacityMax.value)
};
}
function main() {
const doc = Document.current;
if (!doc) {
alert("This script requires an open document");
return;
}
const nodes = doc.selection.nodes.toArray();
if (nodes.length == 0) {
alert("Please select one or more objects");
return;
}
const sources = nodes.map(node => ({ node, centre: node.getSpreadBaseBox().centre }));
const dlg = buildDialog(doc);
const build = () => createRandomiseCommand(doc, sources, readOptions(dlg));
dlg.reshuffle.onClickHandler = () => {
dlg.seed++;
const cmd = build();
if (cmd)
doc.executeCommand(cmd, true);
};
previewLoop(doc, dlg, build);
}
module.exports.main = main;