//Revision: JCarpenter 10/06
/// <summary>
/// Find the object currently under the mouse cursor, and return its state.
/// </summary>
ContextMenuObjectState GetObjectState()
{
var objState = ContextMenuObjectState.Background;
// Determine object state
var mousePt = PointToClient(MousePosition);
int iPt;
GraphPane pane;
object nearestObj;
using (var g = CreateGraphics())
if (MasterPane.FindNearestPaneObject(
mousePt,
g,
out pane,
out nearestObj,
out iPt))
{
var item = nearestObj as CurveItem;
if (item != null && iPt >= 0)
{
objState = item.IsSelected ? ContextMenuObjectState.ActiveSelection : ContextMenuObjectState.InactiveSelection;
}
}
return(objState);
}
//---------------------------------------------------------------------------
//---------------------------------------------------------------------------
#region Non-Public
//---------------------------------------------------------------------------
#region Non-Public Methods
///--------------------------------------------------------------------------
/// <summary>
/// Individual x- and y- zooming. If, during a zoom action, the extention in
/// one of the directions is less than 10 pixels, the zoom action is only be
/// done for the direction with the big extension. A line is drawn instead
/// of the rectangular rubberband.
/// </summary>
/// <returns>True, if a line has been drawn, false otherwise.</returns>
///--------------------------------------------------------------------------
/*
* private bool DrawLineInsteadOfRectangle()
* {
* if (!EnableIndividualXYZoom)
* return false;
*
* Color color = Color.Cyan;
* int xPad = Math.Abs(_dragStartPt.X - _dragEndPt.X);
* int yPad = Math.Abs(_dragStartPt.Y - _dragEndPt.Y);
*
* if (!_drawCrossline && (xPad > 1 || yPad > 1))
* _drawCrossline = true;
*
* if (xPad < 10)
* {
* // Draw vertical line.
* Point p1 = new Point(_dragStartPt.X, _dragStartPt.Y);
* Point p2 = new Point(_dragStartPt.X, _dragEndPt.Y);
* ControlPaint.DrawReversibleLine(PointToScreen(p1), PointToScreen(p2), color);
* if (_drawCrossline)
* {
* p1 = new Point(_dragStartPt.X - 10, _dragStartPt.Y);
* p2 = new Point(_dragStartPt.X + 10, _dragStartPt.Y);
* ControlPaint.DrawReversibleLine(PointToScreen(p1), PointToScreen(p2), color);
*
* p1 = new Point(_dragStartPt.X - 10, _dragEndPt.Y);
* p2 = new Point(_dragStartPt.X + 10, _dragEndPt.Y);
* ControlPaint.DrawReversibleLine(PointToScreen(p1), PointToScreen(p2), color);
* }
*
* _isEnableHZoom = false;
* _isEnableVZoom = true;
* return true;
* }
*
* if (yPad < 10)
* {
* // Draw horizontal line.
* Point p1 = new Point(_dragStartPt.X, _dragStartPt.Y);
* Point p2 = new Point(_dragEndPt.X, _dragStartPt.Y);
* ControlPaint.DrawReversibleLine(PointToScreen(p1), PointToScreen(p2), color);
* if (_drawCrossline)
* {
* p1 = new Point(_dragStartPt.X, _dragStartPt.Y - 10);
* p2 = new Point(_dragStartPt.X, _dragStartPt.Y + 10);
* ControlPaint.DrawReversibleLine(PointToScreen(p1), PointToScreen(p2), color);
*
* p1 = new Point(_dragEndPt.X, _dragStartPt.Y - 10);
* p2 = new Point(_dragEndPt.X, _dragStartPt.Y + 10);
* ControlPaint.DrawReversibleLine(PointToScreen(p1), PointToScreen(p2), color);
* }
*
* _isEnableVZoom = false;
* _isEnableHZoom = true;
* return true;
* }
*
* // Draw rectangle as usual.
* _drawCrossline = false;
* _isEnableHZoom = true;
* _isEnableVZoom = true;
* return false;
* }
*/
///------------------------------------------------------------------------
/// <summary>
/// Handles the Opening event of the ContextMenuStrip control.
/// It should not pop down when a legend item was clicked.
/// </summary>
/// <param name="sender">The source of the event.</param>
/// <param name="e">The <see cref="System.ComponentModel.CancelEventArgs"/>
/// instance containing the event data.</param>
///------------------------------------------------------------------------
private void ContextMenuStrip_Opening(object sender, CancelEventArgs e)
{
var graphPane = this.MasterPane.FindPane(this._menuClickPt);
using (var g = this.CreateGraphics())
{
object nearestObject;
int index;
if (MasterPane.FindNearestPaneObject(_menuClickPt, g, out graphPane, out nearestObject, out index))
{
if (nearestObject is Legend)
{
e.Cancel = true;
}
}
else if (MasterPane.Legend.FindPoint(_menuClickPt, MasterPane, MasterPane.CalcScaleFactor(), out index))
{
e.Cancel = true;
}
}
}
/// <summary>
/// private method for handling MouseMove events to display tooltips over
/// individual datapoints.
/// </summary>
/// <param name="sender">
/// A reference to the control that has the MouseMove event.
/// </param>
/// <param name="e">
/// A MouseEventArgs object.
/// </param>
private void ZedGraphControl_MouseMove(object sender, MouseEventArgs e)
{
Point mousePt = new Point(e.X, e.Y);
SetCursor(mousePt);
// If the mouse is being dragged,
// undraw and redraw the rectangle as the mouse moves.
if (this.isZooming)
{
// Hide the previous rectangle by calling the
// DrawReversibleFrame method with the same parameters.
ControlPaint.DrawReversibleFrame(this.dragRect,
this.BackColor, FrameStyle.Dashed);
// Calculate the endpoint and dimensions for the new
// rectangle, again using the PointToScreen method.
Point curPt = ((Control)sender).PointToScreen(mousePt);
this.dragRect.Width = curPt.X - this.dragRect.X;
this.dragRect.Height = curPt.Y - this.dragRect.Y;
// Draw the new rectangle by calling DrawReversibleFrame
// again.
ControlPaint.DrawReversibleFrame(this.dragRect,
this.BackColor, FrameStyle.Dashed);
}
else if (this.isPanning)
{
double x1, x2, y1, y2, yy1, yy2;
PointF endPoint = new PointF(e.X, e.Y);
PointF startPoint = ((Control)sender).PointToClient(this.dragRect.Location);
this.dragPane.ReverseTransform(startPoint, out x1, out y1, out yy1);
this.dragPane.ReverseTransform(endPoint, out x2, out y2, out yy2);
this.dragPane.XAxis.Min += x1 - x2;
this.dragPane.XAxis.Max += x1 - x2;
this.dragPane.YAxis.Min += y1 - y2;
this.dragPane.YAxis.Max += y1 - y2;
Refresh();
this.dragRect.Location = ((Control)sender).PointToScreen(mousePt);
}
else if (isShowPointValues)
{
int iPt;
GraphPane pane;
object nearestObj;
Graphics g = this.CreateGraphics();
if (masterPane.FindNearestPaneObject(new PointF(e.X, e.Y),
g, out pane, out nearestObj, out iPt))
{
if (nearestObj is CurveItem && iPt >= 0)
{
CurveItem curve = (CurveItem)nearestObj;
if (curve is PieItem)
{
this.pointToolTip.SetToolTip(this,
((PieItem)curve).Value.ToString(this.pointValueFormat));
}
else
{
PointPair pt = curve.Points[iPt];
if (pt.Tag is string)
{
this.pointToolTip.SetToolTip(this, (string)pt.Tag);
}
else
{
string xStr, yStr;
if (pane.XAxis.IsDate)
{
xStr = XDate.ToString(pt.X, this.pointDateFormat);
}
else if (pane.XAxis.IsText && pane.XAxis.TextLabels != null &&
iPt >= 0 && iPt < pane.XAxis.TextLabels.Length)
{
xStr = pane.XAxis.TextLabels[iPt];
}
else
{
xStr = pt.X.ToString(this.pointValueFormat);
}
Axis yAxis = curve.IsY2Axis ? (Axis)pane.Y2Axis : (Axis)pane.YAxis;
if (yAxis.IsDate)
{
yStr = XDate.ToString(pt.Y, this.pointDateFormat);
}
else if (yAxis.IsText && yAxis.TextLabels != null &&
iPt >= 0 && iPt < yAxis.TextLabels.Length)
{
yStr = yAxis.TextLabels[iPt];
}
else
{
yStr = pt.Y.ToString(this.pointValueFormat);
}
this.pointToolTip.SetToolTip(this, "( " + xStr + ", " + yStr + " )");
//this.pointToolTip.SetToolTip( this,
// curve.Points[iPt].ToString( this.pointValueFormat ) );
}
}
this.pointToolTip.Active = true;
}
else
{
this.pointToolTip.Active = false;
}
}
g.Dispose();
}
}