freesewing/src/path.js

import attributes from "./attributes";

function path() {
  this.render = true;
  this.attributes = new attributes();

  /** Adds a move operation to Point to */
  this.prototype.move = function(to) {
    this.ops.push({ type: "move", to });

    return this;
  };

  /** Adds a line operation to Point to */
  this.prototype.line = function(to) {
    this.ops.push({ type: "line", to });

    return this;
  };

  /** Adds a line operation to Point to */
  this.prototype.curve = function(cp1, cp2, to) {
    this.ops.push({ type: "curve", cp1, cp2, to });

    return this;
  };

  /** Adds a close operation */
  this.prototype.close = function() {
    this.ops.push({ type: "close" });

    return this;
  };

  /** Adds an attribute. This is here to make this call chainable in assignment */
  this.prototype.attr = function(name, value) {
    this.attributes.add(name, value);

    return this;
  };

  /** Returns SVG pathstring for this path */
  this.prototype.asPathstring = function() {
    let d = "";
    for (let op of this.ops) {
      switch (op.type) {
        case "move":
          d += `M ${op.to.x},${op.to.y}`;
          break;
        case "line":
          d += ` L ${op.to.x},${op.to.y}`;
          break;
        case "curve":
          d += ` C ${op.cp1.x},${op.cp1.y} ${op.cp2.x},${op.cp2.y} ${op.to.x},${
            op.to.y
          }`;
          break;
        case "close":
          d += " z";
          break;
        default:
          throw `${op.type} is not a valid path command`;
          break;
      }
    }

    return d;
  };

  return this;
}

export default path;