lottie-web/player/js/elements/canvasElements/CVTextElement.js

After Effects plugin for exporting animations to SVG + JavaScript or canvas + JavaScript

import {
  extendPrototype,
} from '../../utils/functionExtensions';
import {
  createSizedArray,
} from '../../utils/helpers/arrays';
import createTag from '../../utils/helpers/html_elements';
import RenderableElement from '../helpers/RenderableElement';
import BaseElement from '../BaseElement';
import TransformElement from '../helpers/TransformElement';
import HierarchyElement from '../helpers/HierarchyElement';
import FrameElement from '../helpers/FrameElement';
import ITextElement from '../TextElement';
import CVBaseElement from './CVBaseElement';

function CVTextElement(data, globalData, comp) {
  this.textSpans = [];
  this.yOffset = 0;
  this.fillColorAnim = false;
  this.strokeColorAnim = false;
  this.strokeWidthAnim = false;
  this.stroke = false;
  this.fill = false;
  this.justifyOffset = 0;
  this.currentRender = null;
  this.renderType = 'canvas';
  this.values = {
    fill: 'rgba(0,0,0,0)',
    stroke: 'rgba(0,0,0,0)',
    sWidth: 0,
    fValue: '',
  };
  this.initElement(data, globalData, comp);
}
extendPrototype([BaseElement, TransformElement, CVBaseElement, HierarchyElement, FrameElement, RenderableElement, ITextElement], CVTextElement);

CVTextElement.prototype.tHelper = createTag('canvas').getContext('2d');

CVTextElement.prototype.buildNewText = function () {
  var documentData = this.textProperty.currentData;
  this.renderedLetters = createSizedArray(documentData.l ? documentData.l.length : 0);

  var hasFill = false;
  if (documentData.fc) {
    hasFill = true;
    this.values.fill = this.buildColor(documentData.fc);
  } else {
    this.values.fill = 'rgba(0,0,0,0)';
  }
  this.fill = hasFill;
  var hasStroke = false;
  if (documentData.sc) {
    hasStroke = true;
    this.values.stroke = this.buildColor(documentData.sc);
    this.values.sWidth = documentData.sw;
  }
  var fontData = this.globalData.fontManager.getFontByName(documentData.f);
  var i;
  var len;
  var letters = documentData.l;
  var matrixHelper = this.mHelper;
  this.stroke = hasStroke;
  this.values.fValue = documentData.finalSize + 'px ' + this.globalData.fontManager.getFontByName(documentData.f).fFamily;
  len = documentData.finalText.length;
  // this.tHelper.font = this.values.fValue;
  var charData;
  var shapeData;
  var k;
  var kLen;
  var shapes;
  var j;
  var jLen;
  var pathNodes;
  var commands;
  var pathArr;
  var singleShape = this.data.singleShape;
  var trackingOffset = documentData.tr * 0.001 * documentData.finalSize;
  var xPos = 0;
  var yPos = 0;
  var firstLine = true;
  var cnt = 0;
  for (i = 0; i < len; i += 1) {
    charData = this.globalData.fontManager.getCharData(documentData.finalText[i], fontData.fStyle, this.globalData.fontManager.getFontByName(documentData.f).fFamily);
    shapeData = (charData && charData.data) || {};
    matrixHelper.reset();
    if (singleShape && letters[i].n) {
      xPos = -trackingOffset;
      yPos += documentData.yOffset;
      yPos += firstLine ? 1 : 0;
      firstLine = false;
    }
    shapes = shapeData.shapes ? shapeData.shapes[0].it : [];
    jLen = shapes.length;
    matrixHelper.scale(documentData.finalSize / 100, documentData.finalSize / 100);
    if (singleShape) {
      this.applyTextPropertiesToMatrix(documentData, matrixHelper, letters[i].line, xPos, yPos);
    }
    commands = createSizedArray(jLen - 1);
    var commandsCounter = 0;
    for (j = 0; j < jLen; j += 1) {
      if (shapes[j].ty === 'sh') {
        kLen = shapes[j].ks.k.i.length;
        pathNodes = shapes[j].ks.k;
        pathArr = [];
        for (k = 1; k < kLen; k += 1) {
          if (k === 1) {
            pathArr.push(matrixHelper.applyToX(pathNodes.v[0][0], pathNodes.v[0][1], 0), matrixHelper.applyToY(pathNodes.v[0][0], pathNodes.v[0][1], 0));
          }
          pathArr.push(matrixHelper.applyToX(pathNodes.o[k - 1][0], pathNodes.o[k - 1][1], 0), matrixHelper.applyToY(pathNodes.o[k - 1][0], pathNodes.o[k - 1][1], 0), matrixHelper.applyToX(pathNodes.i[k][0], pathNodes.i[k][1], 0), matrixHelper.applyToY(pathNodes.i[k][0], pathNodes.i[k][1], 0), matrixHelper.applyToX(pathNodes.v[k][0], pathNodes.v[k][1], 0), matrixHelper.applyToY(pathNodes.v[k][0], pathNodes.v[k][1], 0));
        }
        pathArr.push(matrixHelper.applyToX(pathNodes.o[k - 1][0], pathNodes.o[k - 1][1], 0), matrixHelper.applyToY(pathNodes.o[k - 1][0], pathNodes.o[k - 1][1], 0), matrixHelper.applyToX(pathNodes.i[0][0], pathNodes.i[0][1], 0), matrixHelper.applyToY(pathNodes.i[0][0], pathNodes.i[0][1], 0), matrixHelper.applyToX(pathNodes.v[0][0], pathNodes.v[0][1], 0), matrixHelper.applyToY(pathNodes.v[0][0], pathNodes.v[0][1], 0));
        commands[commandsCounter] = pathArr;
        commandsCounter += 1;
      }
    }
    if (singleShape) {
      xPos += letters[i].l;
      xPos += trackingOffset;
    }
    if (this.textSpans[cnt]) {
      this.textSpans[cnt].elem = commands;
    } else {
      this.textSpans[cnt] = { elem: commands };
    }
    cnt += 1;
  }
};

CVTextElement.prototype.renderInnerContent = function () {
  this.validateText();
  var ctx = this.canvasContext;
  ctx.font = this.values.fValue;
  this.globalData.renderer.ctxLineCap('butt');
  // ctx.lineCap = 'butt';
  this.globalData.renderer.ctxLineJoin('miter');
  // ctx.lineJoin = 'miter';
  this.globalData.renderer.ctxMiterLimit(4);
  // ctx.miterLimit = 4;

  if (!this.data.singleShape) {
    this.textAnimator.getMeasures(this.textProperty.currentData, this.lettersChangedFlag);
  }

  var i;
  var len;
  var j;
  var jLen;
  var k;
  var kLen;
  var renderedLetters = this.textAnimator.renderedLetters;

  var letters = this.textProperty.currentData.l;

  len = letters.length;
  var renderedLetter;
  var lastFill = null;
  var lastStroke = null;
  var lastStrokeW = null;
  var commands;
  var pathArr;
  var renderer = this.globalData.renderer;
  for (i = 0; i < len; i += 1) {
    if (!letters[i].n) {
      renderedLetter = renderedLetters[i];
      if (renderedLetter) {
        renderer.save();
        renderer.ctxTransform(renderedLetter.p);
        renderer.ctxOpacity(renderedLetter.o);
      }
      if (this.fill) {
        if (renderedLetter && renderedLetter.fc) {
          if (lastFill !== renderedLetter.fc) {
            renderer.ctxFillStyle(renderedLetter.fc);
            lastFill = renderedLetter.fc;
            // ctx.fillStyle = renderedLetter.fc;
          }
        } else if (lastFill !== this.values.fill) {
          lastFill = this.values.fill;
          renderer.ctxFillStyle(this.values.fill);
          // ctx.fillStyle = this.values.fill;
        }
        commands = this.textSpans[i].elem;
        jLen = commands.length;
        this.globalData.canvasContext.beginPath();
        for (j = 0; j < jLen; j += 1) {
          pathArr = commands[j];
          kLen = pathArr.length;
          this.globalData.canvasContext.moveTo(pathArr[0], pathArr[1]);
          for (k = 2; k < kLen; k += 6) {
            this.globalData.canvasContext.bezierCurveTo(pathArr[k], pathArr[k + 1], pathArr[k + 2], pathArr[k + 3], pathArr[k + 4], pathArr[k + 5]);
          }
        }
        this.globalData.canvasContext.closePath();
        renderer.ctxFill();
        // this.globalData.canvasContext.fill();
        /// ctx.fillText(this.textSpans[i].val,0,0);
      }
      if (this.stroke) {
        if (renderedLetter && renderedLetter.sw) {
          if (lastStrokeW !== renderedLetter.sw) {
            lastStrokeW = renderedLetter.sw;
            renderer.ctxLineWidth(renderedLetter.sw);
            // ctx.lineWidth = renderedLetter.sw;
          }
        } else if (lastStrokeW !== this.values.sWidth) {
          lastStrokeW = this.values.sWidth;
          renderer.ctxLineWidth(this.values.sWidth);
          // ctx.lineWidth = this.values.sWidth;
        }
        if (renderedLetter && renderedLetter.sc) {
          if (lastStroke !== renderedLetter.sc) {
            lastStroke = renderedLetter.sc;
            renderer.ctxStrokeStyle(renderedLetter.sc);
            // ctx.strokeStyle = renderedLetter.sc;
          }
        } else if (lastStroke !== this.values.stroke) {
          lastStroke = this.values.stroke;
          renderer.ctxStrokeStyle(this.values.stroke);
          // ctx.strokeStyle = this.values.stroke;
        }
        commands = this.textSpans[i].elem;
        jLen = commands.length;
        this.globalData.canvasContext.beginPath();
        for (j = 0; j < jLen; j += 1) {
          pathArr = commands[j];
          kLen = pathArr.length;
          this.globalData.canvasContext.moveTo(pathArr[0], pathArr[1]);
          for (k = 2; k < kLen; k += 6) {
            this.globalData.canvasContext.bezierCurveTo(pathArr[k], pathArr[k + 1], pathArr[k + 2], pathArr[k + 3], pathArr[k + 4], pathArr[k + 5]);
          }
        }
        this.globalData.canvasContext.closePath();
        renderer.ctxStroke();
        // this.globalData.canvasContext.stroke();
        /// ctx.strokeText(letters[i].val,0,0);
      }
      if (renderedLetter) {
        this.globalData.renderer.restore();
      }
    }
  }
};

export default CVTextElement;