/// <summary>
/// MouseMove method for PlotDrag interaction
/// </summary>
/// <param name="X">mouse X position</param>
/// <param name="Y"> mouse Y position</param>
/// <param name="keys"> mouse and keyboard modifiers</param>
/// <param name="ps">the InteractivePlotSurface2D</param>
public override bool DoMouseMove(int X, int Y, Modifier keys, InteractivePlotSurface2D ps)
{
Rectangle area = ps.PlotAreaBoundingBoxCache;
// Mouse Left-Button gives Plot Drag, Ctrl.Left-Button Zooms
if (((keys & Modifier.Button1) != 0) && dragInitiated_) {
ps.CacheAxes();
double dX = X - lastPoint_.X; // distance mouse has moved
double dY = Y - lastPoint_.Y;
lastPoint_ = new Point(X, Y);
if ((keys & Modifier.Control) != 0) {
// Axis re-ranging required
double factor = Sensitivity;
if ((keys & Modifier.Alt) != 0) {
factor *= 0.25; // arbitrary change
}
double xProportion = +dX*factor/area.Width;
double yProportion = -dY*factor/area.Height;
if (horizontal_) {
ps.ZoomAxis(ps.XAxis1, xProportion, focusX);
ps.ZoomAxis(ps.XAxis2, xProportion, focusX);
}
if (vertical_) {
ps.ZoomAxis(ps.YAxis1, yProportion, focusY);
ps.ZoomAxis(ps.YAxis2, yProportion, focusY);
}
}
else {
// Axis translation required
double xShift = -dX / area.Width;
double yShift = +dY / area.Height;
if (horizontal_) {
ps.TranslateAxis(ps.XAxis1, xShift);
ps.TranslateAxis(ps.XAxis2, xShift);
}
if (vertical_) {
ps.TranslateAxis(ps.YAxis1, yShift);
ps.TranslateAxis(ps.YAxis2, yShift);
}
}
return true;
}
return false;
}
