private void MouseWheel(object sender, MouseEventArgs e)
{
int amount = e.Delta * SystemInformation.MouseWheelScrollLines / 120;
int numberOfPixelsToMove = amount;
if (numberOfPixelsToMove == 0)
{
return;
}
if (m_dragHandler == null)
{
return;
}
DragData dragData = new DragData();
dragData.YPercent = (float)(numberOfPixelsToMove) / (float)m_drawSurface.Height;
dragData.Button = MouseButtons.Right;
m_dragHandler(dragData);
}
void PerformDrag(int x, int y, MouseButtons btn)
{
if (m_dragHandler == null)
{
return;
}
DragData dragData = new DragData();
dragData.X = x;
dragData.Y = y;
dragData.XDiff = x - m_lastX;
dragData.YDiff = y - m_lastY;
// This is the increment we moved, scaled to the window size.
dragData.XPercent = (float)(dragData.XDiff) / (float)m_drawSurface.Width;
dragData.YPercent = (float)(dragData.YDiff) / (float)m_drawSurface.Height;
// How much we rotated relative to center.
double x1 = m_lastX - m_drawSurface.Width / 2, y1 = m_drawSurface.Height / 2 - m_lastY;
double x2 = x - m_drawSurface.Width / 2, y2 = m_drawSurface.Height / 2 - y;
double angle1 = Math.Atan2(y1, x1);
double angle2 = Math.Atan2(y2, x2);
dragData.Rotation = (float)angle2 - (float)angle1;
// Our radial change.
double r1 = Math.Sqrt(x1 * x1 + y1 * y1);
double r2 = Math.Sqrt(x2 * x2 + y2 * y2);
dragData.Radial = (float)r2 - (float)r1;
dragData.RadialPercent = (float)r2 / (float)r1;
dragData.Button = btn;
dragData.ShiftDown = this.ShiftDown;
dragData.CtrlDown = this.CtrlDown;
m_dragHandler(dragData);
}