vectorengine/lib/DisplayString.ts

This is a minimal WebGL vector rendering engine written for AssemblyScript.

import { Char } from './Char';

export class DisplayString {
  charArray: StaticArray<Char>;
  private _color: u32 = 0xff_ff_ff_ff;
  private _x: f32;
  private _y: f32;
  private _scale: f32;

  constructor(str: String, x: f32, y: f32,
    scale: f32, color: u32 = 0xff_ff_ff_ff) {
    const len = str.length;
    this._x = x;
    this._y = y;
    let cx = x - <f32>len * scale + scale / 2.0;
    this._color = color;
    this._scale = scale;
    this.charArray = new StaticArray<Char>(len);
    for (let i: i32 = 0; i < len; i++) {
      this.charArray[i] = new Char();
      this.charArray[i].charCode = str.charCodeAt(i);
      this.charArray[i].x = cx;
      this.charArray[i].y = y;
      this.charArray[i].color = color;
      this.charArray[i].scale = scale;
      cx += scale * 2.0;
    }
  }

  set x(val: f32) {
    let len = this.charArray.length;
    let cx = val - <f32>len * this._scale + this._scale / 2.0;
    this._x = val;

    for (let i: i32 = 0; i < len; i++) {
      this.charArray[i].x = cx;
      cx += this._scale * 2;
    }
  }

  @inline get x(): f32 {
    return this._x;
  }

  set y(val: f32) {
    let len = this.charArray.length;
    this._y = val;
    for (let i: i32 = 0; i < len; i++) {
      this.charArray[i].y = val;
    }
  }
  @inline get y(): f32 {
    return this._y;
  }

  set color(val: u32) {
    let len = this.charArray.length;
    this._color = val;
    for (let i: i32 = 0; i < len; i++) {
      this.charArray[i].color = val;
    }
  }
  @inline get color(): u32 {
    return this._color;
  }

  set scale(val: f32) {
    let len = this.charArray.length;
    this._scale = val;
    for (let i: i32 = 0; i < len; i++) {
      this.charArray[i].scale = val;
    }
    let cx = this._x - <f32>len * this._scale + this._scale / 2.0;

    for (let i: i32 = 0; i < len; i++) {
      this.charArray[i].x = cx;
      cx += this._scale * 2;
    }
  }
  @inline get scale(): f32 {
    return this._scale;
  }

  @inline public render(): void {
    let len = this.charArray.length;
    for (let i: i32 = 0; i < len; i++) {
      this.charArray[i].render();
    }
  }
}