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  • §

    Block factory

    Block entitys are rectangles rendered onto a DOM <canvas> element using the Canvas API’s Path2D interface - specifically the rect method.

  • §

    Imports

    import { constructors } from '../core/library.js';
    import { doCreate, Ωempty } from '../helper/utilities.js';
    
    import baseMix from '../mixin/base.js';
    import entityMix from '../mixin/entity.js';
  • §

    Shared constants

    import { ENTITY } from '../helper/shared-vars.js';
  • §

    Local constants

    const T_BLOCK = 'Block';
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    Block constructor

    const Block = function (items = Ωempty) {
    
        this.entityInit(items);
    
        if (!items.dimensions) {
    
            if (!items.width) this.currentDimensions[0] = this.dimensions[0] = 10;
            if (!items.height) this.currentDimensions[1] = this.dimensions[1] = 10;
        }
        return this;
    };
  • §

    Block prototype

    const P = Block.prototype = doCreate();
    P.type = T_BLOCK;
    P.lib = ENTITY;
    P.isArtefact = true;
    P.isAsset = false;
  • §

    Mixins

    baseMix(P);
    entityMix(P);
  • §

    Block attributes

    No additional attributes required beyond those supplied by the mixins

  • §

    Packet management

    No additional packet functionality required

  • §

    Clone management

    No additional clone functionality required

  • §

    Kill management

    No additional kill functionality required

  • §

    Get, Set, deltaSet

    No additional functionality required

  • §

    Prototype functions

  • §

    cleanPathObject - Calculate the Block entity’s Path2D object

    P.cleanPathObject = function () {
    
        this.dirtyPathObject = false;
    
        if (!this.noPathUpdates || !this.pathObject) {
    
            const p = this.pathObject = new Path2D();
    
            const handle = this.currentStampHandlePosition,
                scale = this.currentScale,
                dims = this.currentDimensions;
    
            const x = -handle[0] * scale,
                y = -handle[1] * scale,
                w = dims[0] * scale,
                h = dims[1] * scale;
    
            p.rect(x, y, w, h);
        }
    };
  • §

    Factory

    scrawl.makeBlock({
    
        name: 'myblock-fill',
        width: 100,
        height: 100,
        startX: 25,
        startY: 25,
    
        fillStyle: 'green',
        strokeStyle: 'gold',
    
        lineWidth: 6,
        lineJoin: 'round',
        shadowOffsetX: 4,
        shadowOffsetY: 4,
        shadowBlur: 2,
        shadowColor: 'black',
    
    }).clone({
    
        name: 'myblock-draw',
        startX: 175,
    
        method: 'draw',
        sharedState: true,
    });
    
    export const makeBlock = function (items) {
    
        if (!items) return false;
        return new Block(items);
    };
    
    constructors.Block = Block;