@inweb/markup/src/markup/Konva/KonvaCloud.ts

JavaScript 2D markups

import Konva from "konva";
import { IMarkupCloud, IMarkupCloudParams } from "../IMarkupCloud";

export class KonvaCloud implements IMarkupCloud {
  private _ref: Konva.Shape;

  constructor(params: IMarkupCloudParams, ref = null) {
    if (ref) {
      this._ref = ref;
      return;
    }

    if (!params) params = {};
    if (!params.position) params.position = { x: 0, y: 0 };

    const arcRadius = 16;

    this._ref = new Konva.Shape({
      x: params.position.x,
      y: params.position.y,
      width: params.width ?? 200,
      height: params.height ?? 200,
      stroke: params.color ?? "#ff0000",
      strokeWidth: params.lineWidth ?? 4,
      draggable: true,
      strokeScaleEnabled: false,
      globalCompositeOperation: "source-over",
      sceneFunc: (context, shape) => {
        function calculateMidpoint(position, width, height) {
          const midX = position.x + width / 2;
          const midY = position.y + height / 2;
          return { x: midX, y: midY };
        }

        const points = [
          { x: 0, y: 0 },
          { x: 0 + this._ref.width(), y: 0 },
          { x: 0 + this._ref.width(), y: 0 + this._ref.height() },
          { x: 0, y: 0 + this._ref.height() },
          { x: 0, y: 0 },
        ];

        const midPoint = calculateMidpoint({ x: 0, y: 0 }, this._ref.width(), this._ref.height());

        const baseArcLength = 30;
        context.beginPath();
        for (let iPoint = 0; iPoint < points.length - 1; iPoint++) {
          let approxArcLength = baseArcLength;
          const dx = points[iPoint + 1].x - points[iPoint].x;
          const dy = points[iPoint + 1].y - points[iPoint].y;
          const length = Math.sqrt(dx * dx + dy * dy);

          const arcCount = Math.floor(length / approxArcLength);
          const lengthMod = length % approxArcLength;
          approxArcLength = baseArcLength + arcCount / lengthMod;

          let pX = points[iPoint].x + dx / arcCount / 2;
          let pY = points[iPoint].y + dy / arcCount / 2;
          const pEndX = points[iPoint + 1].x;
          const pEndY = points[iPoint + 1].y;
          const endAngle = Math.atan((pEndY - pY) / (pEndX - pX));
          const startAngle = endAngle + Math.PI;
          const counterClockwise = pX > midPoint.x && pY > midPoint.y;
          for (let iArc = 0; iArc < arcCount; iArc++) {
            if (counterClockwise) {
              context.arc(pX, pY, arcRadius, endAngle, startAngle);
            } else {
              context.arc(pX, pY, arcRadius, startAngle, endAngle);
            }

            pX += dx / arcCount;
            pY += dy / arcCount;
          }
        }

        context.closePath();
        // (!) Konva specific method, it is very important
        // it will apply are required styles
        context.fillStrokeShape(shape);
      },
    });

    this._ref.className = "Cloud";

    this._ref.on("transform", (e) => {
      const attrs = e.target.attrs;

      if (attrs.rotation !== this._ref.rotation()) this._ref.rotation(attrs.rotation);

      const scaleByX = Math.abs(attrs.scaleX - 1) > 10e-6;
      const scaleByY = Math.abs(attrs.scaleY - 1) > 10e-6;

      let newWidth = this._ref.width();
      if (scaleByX) newWidth *= attrs.scaleX;
      let newHeight = this._ref.height();
      if (scaleByY) newHeight *= attrs.scaleY;

      const minWidth = 100;
      const minHeight = 100;

      if (newWidth < minWidth) newWidth = minWidth;
      if (newHeight < minHeight) newHeight = minHeight;

      if (scaleByX) {
        this._ref.width(newWidth);
      }

      if (scaleByY) {
        this._ref.height(newHeight);
      }

      this._ref.scale({ x: 1, y: 1 });
    });

    this._ref.getSelfRect = () => {
      return {
        x: 0 - arcRadius,
        y: 0 - arcRadius,
        width: this._ref.width() + 2 * arcRadius,
        height: this._ref.height() + 2 * arcRadius,
      };
    };

    this._ref.id(this._ref._id.toString());
  }

  ref() {
    return this._ref;
  }

  id(): string {
    return this._ref.id();
  }

  enableMouseEditing(value: boolean): void {
    this._ref.draggable(value);
  }

  type(): string {
    return "Cloud";
  }

  getColor(): string {
    return this._ref.stroke() as string;
  }

  setColor(hex: string): void {
    this._ref.stroke(hex);
  }

  getRotation(): number {
    return this._ref.rotation();
  }

  setRotation(degrees: number): void {
    this._ref.rotation(degrees);
  }

  getZIndex(): number {
    return this._ref.zIndex();
  }

  setZIndex(zIndex: number): void {
    this._ref.zIndex(zIndex);
  }

  delete() {
    this._ref.destroy();
    this._ref = null;
  }

  getPosition() {
    return this._ref.position();
  }

  setPosition(x: number, y: number): void {
    this._ref.position({ x, y });
  }

  getWidth(): number {
    return this._ref.width();
  }

  setWidth(w: number): void {
    this._ref.width(w);
  }

  getHeigth(): number {
    return this._ref.height();
  }

  setHeight(h: number): void {
    this._ref.height(h);
  }

  getLineWidth(): number {
    return this._ref.strokeWidth();
  }

  setLineWidth(size: number): void {
    this._ref.strokeWidth(size);
  }
}