This sample demonstrates the scrolling and scaling options that have been available since GoJS 1.5. Enable and disable the options and interact with the Diagram to see how they work.

Enable Infinite Scrolling, setting Diagram.scrollMode

myDiagram.scrollMode = checked ? go.ScrollMode.Infinite : go.ScrollMode.Document;
    

Enable Diagram.positionComputation function

function positionfunc(diagram, pos) {
  var size = diagram.grid.gridCellSize;
  return new go.Point(
    Math.round(pos.x / size.width) * size.width,
    Math.round(pos.y / size.height) * size.height);
}
    

Enable Diagram.scaleComputation function

function scalefunc(diagram, scale) {
  var oldscale = diagram.scale;
  if (scale > oldscale) {
    return oldscale + 0.25;
  } else if (scale < oldscale) {
    return oldscale - 0.25;
  }
  return oldscale;
}