Function handleInteraction

stackgl_modules/index.js:18298–18348

(buttons, x, y, mods)

    }, hasPassive ? {passive: true} : false)

    function handleInteraction (buttons, x, y, mods) {
      var keyBindingMode = camera.keyBindingMode

      if(keyBindingMode === false) return

      var rotate = keyBindingMode === 'rotate'
      var pan = keyBindingMode === 'pan'
      var zoom = keyBindingMode === 'zoom'

      var ctrl = !!mods.control
      var alt = !!mods.alt
      var shift = !!mods.shift
      var left = !!(buttons & 1)
      var right = !!(buttons & 2)
      var middle = !!(buttons & 4)

      var scale = 1.0 / element.clientHeight
      var dx    = scale * (x - camera._lastX)
      var dy    = scale * (y - camera._lastY)

      var flipX = camera.flipX ? 1 : -1
      var flipY = camera.flipY ? 1 : -1

      var drot  = Math.PI * camera.rotateSpeed

      var t = now()

      if(camera._lastX !== -1 && camera._lastY !== -1) {
        if((rotate && left && !ctrl && !alt && !shift) || (left && !ctrl && !alt && shift)) {
          // Rotate
          view.rotate(t, flipX * drot * dx, -flipY * drot * dy, 0)
        }

        if((pan && left && !ctrl && !alt && !shift) || right || (left && ctrl && !alt && !shift)) {
          // Pan
          view.pan(t, -camera.translateSpeed * dx * distance, camera.translateSpeed * dy * distance, 0)
        }

        if((zoom && left && !ctrl && !alt && !shift) || middle || (left && !ctrl && alt && !shift)) {
          // Zoom
          var kzoom = -camera.zoomSpeed * dy / window.innerHeight * (t - view.lastT()) * 100
          view.pan(t, 0, 0, distance * (Math.exp(kzoom) - 1))
        }
      }

      camera._lastX = x
      camera._lastY = y
      camera._lastMods = mods

      return true
    }

    camera.wheelListener = mouseWheel(element, function(dx, dy) {
      // TODO remove now that we can disable scroll via scrollZoom?