Function getIndexFromPoint

src/js/svgcanvas.js:3550–3575

(mouse_x, mouse_y)

  }
  
  function getIndexFromPoint(mouse_x, mouse_y) {
    // Position cursor here
    var pt = svgroot.createSVGPoint();
    pt.x = mouse_x;
    pt.y = mouse_y;

    // No content, so return 0
    if(chardata.length == 1) return 0;
    // Determine if cursor should be on left or right of character
    var charpos = curtext.getCharNumAtPosition(pt);
    if(charpos < 0) {
      // Out of text range, look at mouse coords
      charpos = chardata.length - 2;
      if(mouse_x <= chardata[0].x) {
        charpos = 0;
      }
    } else if(charpos >= chardata.length - 2) {
      charpos = chardata.length - 2;
    }
    var charbb = chardata[charpos];
    var mid = charbb.x + (charbb.width/2);
    if(mouse_x > mid) {
      charpos++;
    }
    return charpos;
  }
  
  function setCursorFromPoint(mouse_x, mouse_y) {
    setCursor(getIndexFromPoint(mouse_x, mouse_y));