I, personally, could never get the mousewheel interaction to perform.
I implemented a double click Zoom though (C#). You'll need to have the form
capture all key presses to catch the Control key (used to return the chart
to normal view). And a bunch of this code is my custom stuff - but you
should get the picture.
protected void Zoom(NPlot.Windows.PlotSurface2D ps, int zoomFactor,
int x, int y) {
try {
Point minPoint = new Point(0, 0);
minPoint.X = x - zoomFactor;
minPoint.Y = y - (int)(zoomFactor / 1.4);
Point maxPoint = new Point(0, 0);
maxPoint.X = x + zoomFactor;
maxPoint.Y = y + (int)(zoomFactor / 1.4);
ps.CacheAxes();
ps.PhysicalXAxis1Cache.SetWorldLimitsFromPhysical(minPoint,
maxPoint);
ps.PhysicalXAxis2Cache.SetWorldLimitsFromPhysical(minPoint,
maxPoint);
ps.PhysicalYAxis1Cache.SetWorldLimitsFromPhysical(maxPoint,
minPoint);
ps.PhysicalYAxis2Cache.SetWorldLimitsFromPhysical(maxPoint,
minPoint);
ps.Invalidate();
} catch { }
}
private void plotSurface_DoubleClick(object sender, EventArgs e) {
if (controlKeyIsBeingPressed) {
RedrawAll();
} else {
Zoom(plotSurface, 100, ((MouseEventArgs)e).X,
((MouseEventArgs)e).Y);
}
}
private void frmTest_KeyDown(object sender, KeyEventArgs e) {
if (e.KeyCode == Keys.ControlKey)
controlKeyIsBeingPressed = true;
else
controlKeyIsBeingPressed = false;
}
protected void RedrawAll() {
Charting.DrawChart(plotSurface, chartDataTable, this.Symbol);
DrawTrendLine(plotSurface, chartDataTable, 21, Color.Red,
false);
DrawTrendLine(plotSurface, chartDataTable, 63, Color.Blue,
false);
DrawTrendLine(plotSurface, chartDataTable, 189, Color.Black,
false);
DrawEMATrendLine(plotSurface, chartDataTable,
Convert.ToInt32(txtArraySize.Text), Color.DarkGoldenrod, false);
DrawTradeLines(plotSurface, tradeQuotes);
plotSurface.Invalidate();
}
On Wed, Jan 14, 2009 at 8:56 AM, FXHat - <fxh...@gm...> wrote:
> Does anybody use the MouseWheelZoom interaction? Even when I try the demo
> application - ABC plot example, I can not zoom in on the graph using my
> mouse wheel. This plot does have MouseWheelZoom enabled according to the
> source code. Also, is there a way to zoom programatically; i.e. zoom in as
> a
> starting point for the plot so that the user can zoom out if necessary.
>
> Thanks.
>
> ------------------------------------------------------------------------------
> This SF.net email is sponsored by:
> SourcForge Community
> SourceForge wants to tell your story.
> http://p.sf.net/sfu/sf-spreadtheword
> _______________________________________________
> Nplot-devel mailing list
> Npl...@li...
> https://lists.sourceforge.net/lists/listinfo/nplot-devel
>
--
___________________
Dav...@gm...
Lake Oswego, OR
801-473-9213
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
|
