/*
* Returns true if the iter provided is within the visible
* rectangle, false otherwise. If it returns false, the values
* of x and y will be -1.
*/
private bool GetPlotPoint(LinePlot plot, TreeIter iter, out int x, out int y)
{
x = y = -1;
IComparable x_val, y_val;
if (!plot.GetValue(iter, 0, out x_val) ||
!plot.GetValue(iter, 1, out y_val))
{
return(false);
}
if (x_axis == null || y_axis == null)
{
return(false);
}
if (x_axis.IsInRange(x_val) &&
y_axis.IsInRange(y_val))
{
x = GridXToRender(x_axis.ValueToGridCoords(x_val));
y = GridYToRender(y_axis.ValueToGridCoords(y_val));
return(true);
}
return(false);
}
private void FindPointsInRange(IAxis x_axis, IAxis y_axis, out Point[] points)
{
points = new Point[0];
if ((x_axis == null || !x_axis.HasValidRange) ||
(y_axis == null || !y_axis.HasValidRange))
{
// we need both axes to be valid to draw anything
return;
}
ArrayList points_list = new ArrayList();
TreeIter iter;
if (!model.GetIterFirst(out iter))
{
return;
}
Point prev_point = null;
do
{
IComparable x_val, y_val;
if (!GetValue(iter, 0, out x_val) ||
!GetValue(iter, 1, out y_val))
{
continue;
}
// don't clip a gapped point
if (PointGapFunc != null &&
PointGapFunc(model, iter))
{
if (x_axis.IsInRange(x_val))
{
Point p = new Point(x_axis.ValueToGridCoords(x_val),
y_axis.ValueToGridCoords(y_val),
x_val, y_val);
p.IsAGap = true;
points_list.Add(p);
}
continue;
}
// create a line segment between the previous
// point and the current point and see if the
// segment intersects the viewing plane
Point b = new Point(x_axis.ValueToGridCoords(x_val),
y_axis.ValueToGridCoords(y_val),
x_val, y_val);
Point a = new Point(b.X, b.Y, b.XValue, b.YValue);
if (prev_point != null)
{
a = prev_point;
}
// copy b before it becomes clipped
prev_point = b.Clone() as Point;
TreePath path = model.GetPath(iter);
if (selected_path != null &&
selected_path.Compare(path) == 0)
{
b.IsSelected = true;
}
if (focused_path != null &&
focused_path.Compare(path) == 0)
{
b.IsFocused = true;
}
if (ClipSegment(x_axis, y_axis, ref a, ref b))
{
if (a != b && a.IsClipped)
{
points_list.Add(a);
}
points_list.Add(b);
}
} while (model.IterNext(ref iter));
// Sort this list on the x axis
points_list.Sort(new PointXAxisIComparer());
points = (Point[])points_list.ToArray(typeof(Point));
}