I tested the dragdrop demo. It works well anyway I have some
questions/doubts about how marks are showed.
1. If the point is on the border of the chart the mark is not fully
visible.
2. I have charts with a lot of points, the marks are shown below the
points, so often the marks are not fully visible.
I have also another question. I need to draw a unitary circle on a
chart. Here the function I use:
// Draws a unitary circle on the given TAChart with the given color
procedure UnitCircle(ParentChart: TChart; Color: TColor);
var
A, B: TDoublePoint;
AA, BB: TPoint;
begin
A.X:=-1;
A.Y:=-1;
B.X:=1;
B.Y:=1;
AA := ParentChart.GraphToImage (A);
BB := ParentChart.GraphToImage(B);
ParentChart.Canvas.Pen.Mode:= pmCopy;
ParentChart.Canvas.Pen.Color:= Color;
ParentChart.Canvas.Pen.Style:= psDash;
ParentChart.Canvas.Brush.Style:= bsClear;
ParentChart.Canvas.Ellipse(AA.x,AA.y,BB.x,BB.y);
end;
Anyway I don't know when/where I have to call this procedure in order to
be sure that the unitary circle is drawn upon the chart. If I anchor the
chart on the form and I put my procedure on the resizeform event I can
see the circle for a while and then it immediately disappears.
So how can I draw shapes on a chart? I have to put unitary circle but
also other things, such as rays from the origin of the chart (0, 0) to
all the points in a serie.
Could you help me?
regards,
andrea
Andrea Mauri ha scritto:
I use trunk version of lazarus so I will check it.
thanks,
andrea
Alexander Klenin ha scritto:
On Mon, Sep 21, 2009 at 23:39, Andrea Mauri
<[email protected]> wrote:
Dear all,
I am using TAChart and I would like to see the mark of a point when the
point is clicked or the mouse is over it.
Actually I do it using tchart.hint, TChartMouseMove event and
GetNearestPoint function. In this way I show an hint any time the
mouse pass
over a point. Is it possible to do it directly using Marks of TChart?
I would like to decide to show the mark of a single point and not
for all
the points in the serie.
If you do not mind using trunk version, then it is now possible ;-)
See dragdropdemo project.
Note however that this might have performance implications compared
to your
implementation, because showing/hiding the mark requires full chart
redraw.
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