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    ./demo/canvas-001.js ./demo/canvas-002.js ./demo/canvas-003.js ./demo/canvas-004.js ./demo/canvas-005.js ./demo/canvas-006.js ./demo/canvas-007.js ./demo/canvas-008.js ./demo/canvas-009.js ./demo/canvas-010.js ./demo/canvas-011.js ./demo/canvas-012.js ./demo/canvas-013.js ./demo/canvas-014.js ./demo/canvas-015.js ./demo/canvas-015a.js ./demo/canvas-016.js ./demo/canvas-017.js ./demo/canvas-018.js ./demo/canvas-019.js ./demo/canvas-019a.js ./demo/canvas-020.js ./demo/canvas-021.js ./demo/canvas-022.js ./demo/canvas-023.js ./demo/canvas-024.js ./demo/canvas-025.js ./demo/canvas-026.js ./demo/canvas-027.js ./demo/canvas-028.js ./demo/canvas-029.js ./demo/canvas-030.js ./demo/canvas-031.js ./demo/canvas-032.js ./demo/canvas-033.js ./demo/canvas-034.js ./demo/canvas-035.js ./demo/canvas-036.js ./demo/canvas-037.js ./demo/canvas-038.js ./demo/canvas-039.js ./demo/canvas-040.js ./demo/canvas-041.js ./demo/canvas-042.js ./demo/canvas-043.js ./demo/canvas-044.js ./demo/canvas-045.js ./demo/canvas-046.js ./demo/canvas-047.js ./demo/canvas-048.js ./demo/canvas-049.js ./demo/canvas-050.js ./demo/canvas-051.js ./demo/canvas-052.js ./demo/canvas-053.js ./demo/canvas-054.js ./demo/canvas-055.js ./demo/canvas-056.js ./demo/canvas-057.js ./demo/canvas-058.js ./demo/canvas-059.js ./demo/canvas-060.js ./demo/canvas-061.js ./demo/canvas-062.js ./demo/canvas-063.js ./demo/canvas-064.js ./demo/core-001.js ./demo/delaunator-001.js ./demo/delaunator-002.js ./demo/dom-001.js ./demo/dom-002.js ./demo/dom-003.js ./demo/dom-004.js ./demo/dom-005.js ./demo/dom-006.js ./demo/dom-007.js ./demo/dom-008.js ./demo/dom-009.js ./demo/dom-010.js ./demo/dom-011.js ./demo/dom-012.js ./demo/dom-013.js ./demo/dom-015.js ./demo/dom-016.js ./demo/filters-001.js ./demo/filters-002.js ./demo/filters-002a.js ./demo/filters-003.js ./demo/filters-004.js ./demo/filters-005.js ./demo/filters-006.js ./demo/filters-007.js ./demo/filters-008.js ./demo/filters-009.js ./demo/filters-010.js ./demo/filters-011.js ./demo/filters-012.js ./demo/filters-013.js ./demo/filters-014.js ./demo/filters-015.js ./demo/filters-016.js ./demo/filters-017.js ./demo/filters-018.js ./demo/filters-019.js ./demo/filters-020.js ./demo/filters-021.js ./demo/filters-022.js ./demo/filters-023.js ./demo/filters-024.js ./demo/filters-025.js ./demo/filters-026.js ./demo/filters-027.js ./demo/filters-101.js ./demo/filters-102.js ./demo/filters-103.js ./demo/filters-104.js ./demo/filters-105.js ./demo/filters-501.js ./demo/filters-502.js ./demo/filters-503.js ./demo/filters-504.js ./demo/filters-505.js ./demo/mediapipe-001.js ./demo/mediapipe-002.js ./demo/mediapipe-003.js ./demo/modules-001.js ./demo/modules-002.js ./demo/modules-003.js ./demo/modules-004.js ./demo/modules-005.js ./demo/packets-001.js ./demo/packets-002.js ./demo/particles-001.js ./demo/particles-002.js ./demo/particles-003.js ./demo/particles-004.js ./demo/particles-005.js ./demo/particles-006.js ./demo/particles-007.js ./demo/particles-008.js ./demo/particles-009.js ./demo/particles-010.js ./demo/particles-011.js ./demo/particles-012.js ./demo/particles-013.js ./demo/particles-014.js ./demo/particles-015.js ./demo/particles-016.js ./demo/rapier-001.js ./demo/snippets-001.js ./demo/snippets-002.js ./demo/snippets-003.js ./demo/snippets-004.js ./demo/snippets-005.js ./demo/snippets-006.js ./demo/temp-000.js ./demo/temp-001.js ./demo/temp-001a.js ./demo/temp-002.js ./demo/temp-003.js ./demo/temp-004.js ./demo/temp-005.js ./demo/temp-006.js ./demo/temp-007.js ./demo/temp-008.js ./demo/temp-009.js ./demo/temp-010.js ./demo/temp-011.js ./demo/temp-012.js ./demo/temp-013.js ./demo/temp-014.js ./demo/temp-015.js ./demo/temp-016.js ./demo/temp-017.js ./demo/temp-018.js ./demo/temp-018a.js ./demo/temp-019.js ./demo/temp-020.js ./demo/temp-021.js ./demo/temp-022.js ./demo/temp-023.js ./demo/temp-024.js ./demo/temp-025.js ./demo/temp-026.js ./demo/temp-027.js ./demo/temp-028.js ./demo/temp-029.js ./demo/temp-030.js ./demo/temp-031.js ./demo/temp-032.js ./demo/temp-033.js ./demo/temp-034.js ./demo/temp-035.js ./demo/temp-036.js ./demo/temp-037.js ./demo/temp-100.js ./demo/temp-101.js ./demo/temp-102.js ./demo/temp-103.js ./demo/temp-104.js ./demo/temp-200.js ./demo/temp-201.js ./demo/temp-301.js ./demo/temp-inkscapeSvgFilters.js ./demo/temp-lottie.js ./demo/tensorflow-001.js ./demo/tensorflow-002.js ./demo/utilities.js
  • §

    Demo DOM 010

    Add and remove (kill) Scrawl-canvas stack elements programmatically

  • §

    Run code

    import * as scrawl from '../source/scrawl.js'
  • §

    Scene setup

    let library = scrawl.library;
  • §

    Scene animation

    Function that updates the live report on user activity

    let report = function () {
    
        let testTicker = Date.now(),
            testTime, testNow, text,
            testMessage = document.querySelector('#reportmessage');
    
        let artefactnames = library.artefactnames,
            stacknames = library.stacknames,
            elementnames = library.elementnames,
            artefact = library.artefact,
            stack = library.stack,
            element = library.element;
    
        let a, s, el;
    
        return function () {
    
            a = Object.keys(artefact);
            s = Object.keys(stack);
            el = Object.keys(element);
    
            testNow = Date.now();
            testTime = testNow - testTicker;
            testTicker = testNow;
    
            testMessage.textContent = `Screen refresh: ${Math.ceil(testTime)}ms; fps: ${Math.floor(1000 / testTime)}
    artefact - ${a.length}, ${artefactnames.length}: [${(artefactnames).join(', ')}] 
    stack - ${s.length}, ${stacknames.length}: [${(stacknames).join(', ')}] 
    element - ${el.length}, ${elementnames.length}: [${(elementnames).join(', ')}]`;
        };
    }();
  • §

    Animation loop - can’t use scrawl.makeRender in this case because there’s no initial stack/canvas arterfact to render. Using scrawl.makeAnimation which in turn runs scrawl.render instead

    scrawl.makeAnimation({
    
        name: 'demo-animation',
        fn: function () {scrawl.render()},
    });
  • §

    User interaction

    Buttons listener - the control buttons are never part of a Scrawl-canvas stack

    let controls = function () {
    
        let b1 = document.querySelector('#action_1'),
            b2 = document.querySelector('#action_2'),
            b3 = document.querySelector('#action_3'),
            b4 = document.querySelector('#action_4');
  • §

    @ts-expect-error

        b1.disabled = '';
  • §

    @ts-expect-error

        b2.disabled = 'disabled';
  • §

    @ts-expect-error

        b3.disabled = '';
  • §

    @ts-expect-error

        b4.disabled = 'disabled';
    
        let newStack, hostStack;
    
        return function (e) {
    
            e.preventDefault();
            e.returnValue = false;
            
            switch (e.target.id) {
    
                case 'action_1':
  • §

    @ts-expect-error

                    b1.disabled = 'disabled';
  • §

    @ts-expect-error

                    b2.disabled = '';
    
                    newStack = scrawl.addStack({
                        host: '#target',
                        name: 'my-new-stack',
                        width: 300,
                        height: 50,
                    });
    
                    break;
    
                case 'action_2':
  • §

    @ts-expect-error

                    b1.disabled = '';
  • §

    @ts-expect-error

                    b2.disabled = 'disabled';
    
                    newStack.kill();
    
                    break;
    
                case 'action_3':
  • §

    @ts-expect-error

                    b3.disabled = 'disabled';
  • §

    @ts-expect-error

                    b4.disabled = '';
    
                    hostStack = scrawl.addStack({
                        element: '#target',
                    });
    
                    break;
                    
                case 'action_4':
  • §

    @ts-expect-error

                    if (b1.disabled) {
  • §

    @ts-expect-error

                        b1.disabled = '';
  • §

    @ts-expect-error

                        b2.disabled = 'disabled';
                    }
  • §

    @ts-expect-error

                    b3.disabled = 'disabled';
  • §

    @ts-expect-error

                    b4.disabled = 'disabled';
                    
                    hostStack.kill();
    
                    break;
            }
        };
    }();
    
    scrawl.addListener('up', controls, '.control_button');
  • §

    Development and testing

    console.log(scrawl.library);