import * as scrawl from '../source/scrawl.js'
import { reportSpeed } from './utilities.js';import * as scrawl from '../source/scrawl.js'
import { reportSpeed } from './utilities.js';let canvas = scrawl.library.artefact.mycanvas;
scrawl.library.group[canvas.base.name].set({
order: 1,
})Create draggable entitys which will act as the areas in which particles will be generated by the Emitter entitys
let dragItems = scrawl.makeGroup({
name: 'my-drag-items',
host: canvas.base.name,
order: 0,
});
scrawl.makePhrase({
name: 'hello',
group: 'my-drag-items',
text: 'HELLO!',
font: 'bold 100px sans-serif',
lineHeight: 0.8,
startX: 70,
startY: 200,
handleX: 20,
handleY: 20,
roll: -30,
scale: 1.1,
fillStyle: 'aliceblue',
method: 'fillThenDraw',
});
scrawl.makeShape({
name: 'myshape',
group: 'my-drag-items',
pathDefinition: 'M266.2,703.1 h-178 L375.1,990 l287-286.9 H481.9 C507.4,365,683.4,91.9,911.8,25.5 877,15.4,840.9,10,803.9,10 525.1,10,295.5,313.4,266.2,703.1 z',
start: [400, 300],
handle: ['center', 'center'],
scale: 0.2,
roll: -90,
flipUpend: true,
scaleOutline: false,
fillStyle: 'aliceblue',
method: 'fillThenDraw',
});Create a World object which we can then assign to the particle emitter
let myWorld = scrawl.makeWorld({
name: 'demo-world',
tickMultiplier: 2,
});Create the particle Emitter entity
scrawl.makeEmitter({
name: 'emitter-one',
world: myWorld,
generationRate: 60,
killAfterTime: 5,
rangeZ: 0.3,
rangeFromZ: 0.1,We tell the Emitter to generated its Particles randomly, with initial start coordinates constrained to within the area defined by another artefact - we can set the generateInArea attribute by the artefact’s name String, or the artefact object itself.
generateInArea: 'hello',This is the entity the Emitter will be stamping
artefact: scrawl.makeWheel({
name: 'particle-wheel-entity',
radius: 12,
handle: ['center', 'center'],
globalCompositeOperation: 'source-atop',
fillStyle: 'blue',
strokeStyle: 'white',
method: 'fillThenDraw',
visibility: false,
noUserInteraction: true,
noPositionDependencies: true,
noFilters: true,
noDeltaUpdates: true,
}),
stampAction: function (artefact, particle, host) {
let history = particle.history,
remaining, globalAlpha, scale, start, z, roll;
history.forEach((p, index) => {
[remaining, z, ...start] = p;
globalAlpha = remaining / 6;
scale = 1 + (z / 3);
if (globalAlpha > 0 && scale > 0) {
roll = globalAlpha * 720;
artefact.simpleStamp(host, {start, scale, globalAlpha, roll});
}
});
},Test that we can clone the Emitter entity
}).clone({
name: 'emitter-two',
generateInArea: 'myshape',
artefact: scrawl.makeBlock({
name: 'particle-block-entity',
width: 20,
height: 20,
handle: ['center', 'center'],
fillStyle: 'red',
method: 'fillThenDraw',
visibility: false,
globalCompositeOperation: 'source-atop',
noUserInteraction: true,
noPositionDependencies: true,
noFilters: true,
noDeltaUpdates: true,
}),
});Function to display frames-per-second data, and other information relevant to the demo
const particlenames = scrawl.library.particlenames,
particle = scrawl.library.particle;
const report = reportSpeed('#reportmessage', function () {ParticleHistory arrays are not saved in the Scrawl-canvas library; instead we need to count them in each particle
let historyCount = 0;
particlenames.forEach(n => {
let p = particle[n];
if (p) historyCount += p.history.length;
});
return ` Particles: ${particlenames.length}
Stamps per display: ${historyCount}`;
});Create the Display cycle animation
scrawl.makeRender({
name: 'demo-animation',
target: canvas,
afterShow: report,
});scrawl.makeDragZone({
zone: canvas,
collisionGroup: dragItems,
endOn: ['up', 'leave'],
exposeCurrentArtefact: true,
preventTouchDefaultWhenDragging: true,
});console.log(scrawl.library);