Elbow connectors.md

/*

Download this file and save to your Obsidian Vault including the first line, or open it in "Raw" and copy the entire contents to Obsidian.

This script converts the selected connectors to elbows.

See documentation for more details: https://zsviczian.github.io/obsidian-excalidraw-plugin/ExcalidrawScriptsEngine.html

*/
const selectedCenterConnectPoints = await utils.suggester(
    ['Yes', 'No'],
    [true, false],
    "Center connect points?"
  );
const centerConnectPoints = selectedCenterConnectPoints??false;

const allElements = ea.getViewElements();
const elements = ea.getViewSelectedElements();

const lines = elements.filter((el)=>el.type==="arrow" || el.type==="line");

for (const line of lines) {
  if (line.points.length >= 3) {
    if(centerConnectPoints) {
      const startBindingEl = allElements.filter(el => el.id === (line.startBinding||{}).elementId)[0];
	    const endBindingEl = allElements.filter(el => el.id === (line.endBinding||{}).elementId)[0];

      if(startBindingEl) {
        const startPointX = line.x +line.points[0][0];
        if(startPointX >= startBindingEl.x && startPointX <= startBindingEl.x + startBindingEl.width) {
          line.points[0][0] = startBindingEl.x + startBindingEl.width / 2 - line.x;
        }

        const startPointY = line.y +line.points[0][1];
        if(startPointY >= startBindingEl.y && startPointY <= startBindingEl.y + startBindingEl.height) {
          line.points[0][1] = startBindingEl.y + startBindingEl.height / 2 - line.y;
        }
      }

      if(endBindingEl) {
        const startPointX = line.x +line.points[line.points.length-1][0];
        if(startPointX >= endBindingEl.x && startPointX <= endBindingEl.x + endBindingEl.width) {
          line.points[line.points.length-1][0] = endBindingEl.x + endBindingEl.width / 2 - line.x;
        }

        const startPointY = line.y +line.points[line.points.length-1][1];
        if(startPointY >= endBindingEl.y && startPointY <= endBindingEl.y + endBindingEl.height) {
          line.points[line.points.length-1][1] = endBindingEl.y + endBindingEl.height / 2 - line.y;
        }
      }
    }
    
    for (var i = 0; i < line.points.length - 2; i++) {
      var p1;
      var p3;
      if (line.points[i][0] < line.points[i + 2][0]) {
        p1 = line.points[i];
        p3 = line.points[i+2];
      } else {
        p1 = line.points[i + 2];
        p3 = line.points[i];
      }
      const p2 = line.points[i + 1];

      if (p1[0] === p3[0]) {
        continue;
      }

      const k = (p3[1] - p1[1]) / (p3[0] - p1[0]);
      const b = p1[1] - k * p1[0];

      y0 = k * p2[0] + b;
      const up = p2[1] < y0;

      if ((k > 0 && !up) || (k < 0 && up)) {
        p2[0] = p1[0];
        p2[1] = p3[1];
      } else {
        p2[0] = p3[0];
        p2[1] = p1[1];
      }
    }
  }
}

ea.copyViewElementsToEAforEditing(lines);
await ea.addElementsToView(false,false);