Function getDirection

engine/src/VertexBridge.js:84–90

(x0, y0, x1, y1)

    }

    function getDirection(x0, y0, x1, y1) {
      let vectorX = x1 - x0;
      let vectorY = y1 - y0;
      let vector = vec2.fromValues(vectorX, vectorY);

      return vector;
    }

    function getNormal(x0, y0, x1, y1) {
      let direction = getDirection(x0, y0, x1, y1);