avocado-old/packages/graphics/proton/text-node-renderer.js

import {Proton} from './proton';

import {Vector} from '@avocado/math';

export class TextNode {

  constructor(text) {
    this.parent = null;
    const wrapper = window.document.createElement('div');
    this.wrapper = wrapper;
    wrapper.style.position = 'absolute';
    const div = window.document.createElement('div');
    wrapper.appendChild(div);
    div.className = 'particle';
    const span = window.document.createElement('span');
    span.className = 'text';
    span.textContent = text;
    this.span = span;
    div.appendChild(span);
    this.div = div;
  }

  copyFrom(other) {
    this.span.textContent = other.span.textContent;
  }

  update(particle, stage) {
    const {div, span} = this;
    if (particle.useAlpha) {
      const alpha = particle.alpha;
      div.style.opacity = alpha;
    }
    if (particle.useColor) {
      const color = particle.color;
      div.style.color = `rgb(
        ${color.r * 255},
        ${color.g * 255},
        ${color.b * 255}
      )`;
    }
    const {rotation, scale} = particle;
    const camera = stage.camera;
    const position = [particle.p.x, particle.p.y];
    if (camera) {
      const realOffset = camera.realOffset;
      position[0] -= realOffset[0];
      position[1] += realOffset[1];
    }
    const angle = rotation.x / (Math.PI * 2);
    const distanceScale = particle.p.z > 0 ? particle.p.z / 70 : 0;
    div.style.transform = `
      translate(${position[0]}px, ${-position[1]}px)
      rotate(${angle * 360}deg)
      scale(${scale + distanceScale})
    `;
    const spanTranslate = 50 * (1 / scale);
    span.style.transform = `translate(-${spanTranslate}%, -${spanTranslate}%)`;
  }

}

export class TextNodeRenderer extends Proton.BaseRender {

  static get freeList() {
    if (!this._freeList) {
      this._freeList = [];
    }
    return this._freeList;
  }

  constructor(selector, stage) {
    super();
    this._body = new TextNode('');
    this.freeList = [];
    this.name = 'NodeRenderer';
    this.queued = [];
    this.stage = stage;
    const promise = stage.findUiElement(selector);
    promise.then((element) => {
      this.parent = element;
    });
  }

  onParticleCreated(particle) {
    const freeList = this.constructor.freeList;
    if (freeList.length > 0) {
      particle.target = freeList.pop();
      // ...
      if (particle.body) {
        particle.target.copyFrom(particle.body);
      }
    }
    else {
      if (!particle.body) {
        particle.body = this._body.clone();
      }
      particle.target = particle.body;
      particle.target.wrapper.style.opacity = 0;
    }
    if (!this.parent) {
      this.queued.push(particle.target);
    }
    else {
      for (let i = 0; i < this.queued.length; ++i) {
        this.parent.appendChild(this.queued[i].wrapper);
        this.queued[i].parent = this.parent;
        this.queued[i].wrapper.style.opacity = 1;
      }
      this.queued = [];
      if (!particle.target.parent) {
        this.parent.appendChild(particle.target.wrapper);
        particle.target.parent = this.parent;
      }
      particle.target.wrapper.style.opacity = 1;
    }
  }

  onParticleUpdate(particle) {
    if (!particle.target) {
      return;
    }
    particle.target.update(particle, this.stage);
  }

  onParticleDead(particle) {
    particle.target.wrapper.style.opacity = 0;
    const freeList = this.constructor.freeList;
    freeList.push(particle.target);
    particle.target = undefined;
  }

}