/// <summary>
/// Should the camera move up or down?</summary>
/// <param name="modifierKeys">The camera control's ModifierKeys property</param>
/// <param name="e">The camera control's event handler's MouseEventArgs</param>
/// <returns>True if the user wants to move the camera up or down</returns>
/// <remarks>This is used by the fly and walk camera controllers.</remarks>
public override bool IsElevating(Keys modifierKeys, MouseEventArgs e)
{
return
(e.Button == MouseButtons.Middle && (modifierKeys & Keys.Alt) == Keys.Alt) ||
(e.Button == MouseButtons.Left &&
(modifierKeys & (Keys.Alt | Keys.Control)) == (Keys.Alt | Keys.Control));
}
/// <summary>
/// Should the camera do a panning (strafing) motion?</summary>
/// <param name="modifierKeys">The camera control's ModifierKeys property</param>
/// <param name="e">The camera control's event handler's MouseEventArgs</param>
/// <returns>True if the user wants to pan the camera</returns>
public override bool IsPanning(Keys modifierKeys, MouseEventArgs e)
{
return
e.Button == MouseButtons.Middle ||
(e.Button == MouseButtons.Left &&
(modifierKeys & (Keys.Alt | Keys.Control)) == (Keys.Alt | Keys.Control));
}
/// <summary>
/// Does the user want to control the camera in some way?
/// (As opposed to selecting something in the Design View, for example.)</summary>
/// <param name="modifierKeys">The camera control's ModifierKeys property</param>
/// <param name="e">The camera control's event handler's MouseEventArgs</param>
/// <returns>True if the user wants to adjust the camera</returns>
public virtual bool IsControllingCamera(Keys modifierKeys, MouseEventArgs e)
{
return
IsRotating(modifierKeys, e) ||
IsZooming(modifierKeys, e) ||
IsPanning(modifierKeys, e) ||
IsTurning(modifierKeys, e) ||
IsElevating(modifierKeys, e);
}
/// <summary>
/// Should the camera move up or down?</summary>
/// <param name="modifierKeys">The camera control's ModifierKeys property</param>
/// <param name="e">The camera control's event handler's MouseEventArgs</param>
/// <returns>True if the user wants to move the camera up or down</returns>
/// <remarks>This is used by the fly and walk camera controllers.</remarks>
public override bool IsElevating(Keys modifierKeys, MouseEventArgs e)
{
return e.Button == MouseButtons.Middle && (modifierKeys & Keys.Alt) == Keys.Alt;
}
/// <summary>
/// Should the camera zoom in some way?</summary>
/// <param name="modifierKeys">The camera control's ModifierKeys property</param>
/// <param name="e">The camera control's event handler's MouseEventArgs</param>
/// <returns>True if the user wants to zoom the camera</returns>
public override bool IsZooming(Keys modifierKeys, MouseEventArgs e)
{
return
(e.Button == MouseButtons.Right && (modifierKeys & Keys.Alt) == Keys.Alt) ||
e.Delta != 0; //mouse wheel moved?
}
/// <summary>
/// Should the camera do a panning (strafing) motion?</summary>
/// <param name="modifierKeys">The camera control's ModifierKeys property</param>
/// <param name="e">The camera control's event handler's MouseEventArgs</param>
/// <returns>True if the user wants to pan the camera</returns>
public override bool IsPanning(Keys modifierKeys, MouseEventArgs e)
{
return e.Button == MouseButtons.Middle;
}
/// <summary>
/// Should the camera rotate around the look-at point?</summary>
/// <param name="modifierKeys">The camera control's ModifierKeys property</param>
/// <param name="e">The camera control's event handler's MouseEventArgs</param>
/// <returns>True if the user wants to rotate the camera</returns>
public override bool IsRotating(Keys modifierKeys, MouseEventArgs e)
{
return (e.Button == MouseButtons.Left && (modifierKeys & Keys.Alt) == Keys.Alt);
}
/// <summary> /// Should the camera move up or down?</summary> /// <param name="modifierKeys">The camera control's ModifierKeys property</param> /// <param name="e">The camera control's event handler's MouseEventArgs</param> /// <returns>True if the user wants to move the camera up or down</returns> /// <remarks>This is used by the fly and walk camera controllers.</remarks> public abstract bool IsElevating(Keys modifierKeys, MouseEventArgs e);
/// <summary> /// Should the camera turn around in-place? This means that the look-at direction /// changes, but the eye point remains stationary.</summary> /// <param name="modifierKeys">The camera control's ModifierKeys property</param> /// <param name="e">The camera control's event handler's MouseEventArgs</param> /// <returns>True if the user wants to turn the camera around in place</returns> /// <remarks>This is used by the fly and walk camera controllers.</remarks> public abstract bool IsTurning(Keys modifierKeys, MouseEventArgs e);