public BasicChart()
{
this.Events = EventMask.ButtonPressMask | EventMask.ButtonReleaseMask | EventMask.PointerMotionMask;
selectionStart = new ChartCursor ();
selectionStart.Visible = false;
selectionEnd = new ChartCursor ();
selectionEnd.Visible = false;
AddCursor (selectionStart, AxisDimension.X);
AddCursor (selectionEnd, AxisDimension.X);
selectionStart.ValueChanged += new EventHandler (OnSelectionCursorChanged);
selectionEnd.ValueChanged += new EventHandler (OnSelectionCursorChanged);
}
void OnSelectionCursorChanged(object sender, EventArgs args)
{
if (enableSelection) {
if (selectionStart.Value > selectionEnd.Value) {
ChartCursor tmp = selectionStart;
selectionStart = selectionEnd;
selectionEnd = tmp;
}
OnSelectionChanged ();
}
}
void DrawCursorLabel(ChartCursor cursor)
{
Gdk.GC gc = new Gdk.GC (GdkWindow);
gc.RgbFgColor = cursor.Color;
int x, y;
GetPoint (cursor.Value, cursor.Value, out x, out y);
if (cursor.Dimension == AxisDimension.X) {
string text;
if (cursor.LabelAxis != null) {
double minStep = GetMinTickStep (cursor.Dimension);
TickEnumerator tenum = cursor.LabelAxis.GetTickEnumerator (minStep);
tenum.Init (cursor.Value);
text = tenum.CurrentLabel;
} else {
text = GetValueLabel (cursor.Dimension, cursor.Value);
}
if (text != null && text.Length > 0) {
Pango.Layout layout = new Pango.Layout (this.PangoContext);
layout.FontDescription = Pango.FontDescription.FromString ("Tahoma 8");
layout.SetMarkup (text);
int tw, th;
layout.GetPixelSize (out tw, out th);
int tl = x - tw/2;
int tt = top + 4;
if (tl + tw + 2 >= left + width) tl = left + width - tw - 1;
if (tl < left + 1) tl = left + 1;
GdkWindow.DrawRectangle (Style.WhiteGC, true, tl - 1, tt - 1, tw + 2, th + 2);
GdkWindow.DrawRectangle (Style.BlackGC, false, tl - 2, tt - 2, tw + 3, th + 3);
GdkWindow.DrawLayout (gc, tl, tt, layout);
}
} else {
throw new NotSupportedException ();
}
}
void DrawCursor(ChartCursor cursor)
{
Gdk.GC gc = new Gdk.GC (GdkWindow);
gc.RgbFgColor = cursor.Color;
int x, y;
GetPoint (cursor.Value, cursor.Value, out x, out y);
if (cursor.Dimension == AxisDimension.X) {
int cy = top - AreaBorderWidth - 1;
Point[] ps = new Point [4];
ps [0] = new Point (x, cy);
ps [1] = new Point (x + (cursor.HandleSize/2), cy - cursor.HandleSize + 1);
ps [2] = new Point (x - (cursor.HandleSize/2), cy - cursor.HandleSize + 1);
ps [3] = ps [0];
GdkWindow.DrawPolygon (gc, false, ps);
if (activeCursor == cursor)
GdkWindow.DrawPolygon (gc, true, ps);
GdkWindow.DrawLine (gc, x, top, x, top + height);
} else {
throw new NotSupportedException ();
}
}
protected override bool OnButtonPressEvent(Gdk.EventButton ev)
{
if (ev.Button == 1) {
foreach (ChartCursor cursor in cursors) {
int cx, cy;
GetPoint (cursor.Value, cursor.Value, out cx, out cy);
if (cursor.Dimension == AxisDimension.X) {
if (Math.Abs (ev.X - cx) <= 2 || (ev.Y < top && (Math.Abs (ev.X - cx) <= cursor.HandleSize/2))) {
activeCursor = cursor;
draggingCursor = true;
activeCursor.ShowValueLabel = true;
QueueDraw ();
break;
}
} else {
// Implement
}
}
if (enableSelection && !draggingCursor) {
selectionStart.Visible = true;
selectionEnd.Visible = true;
double x, y;
GetValue ((int)ev.X, (int)ev.Y, out x, out y);
// avoid cursor swaping
ChartCursor c1 = selectionStart;
ChartCursor c2 = selectionEnd;
c1.Value = x;
c2.Value = x;
activeCursor = selectionEnd;
activeCursor.ShowValueLabel = true;
draggingCursor = true;
QueueDraw ();
}
if (draggingCursor)
return true;
}
return base.OnButtonPressEvent (ev);
}
public void RemoveCursor(ChartCursor cursor)
{
cursor.ValueChanged -= new EventHandler (OnCursorChanged);
cursor.LayoutChanged -= new EventHandler (OnCursorChanged);
cursors.Remove (cursor);
QueueDraw ();
}
public void AddCursor(ChartCursor cursor, AxisDimension dimension)
{
cursor.Dimension = dimension;
cursor.ValueChanged += new EventHandler (OnCursorChanged);
cursor.LayoutChanged += new EventHandler (OnCursorChanged);
cursors.Add (cursor);
xrangeChanged = yrangeChanged = true;
QueueDraw ();
}