[graph] deleted plots are drawn till resize of graph

Question

I work on CVI2012SP1 and I´m having some trouble with the graph control.
As the stripchart control does make to much trouble for me I went with the graph control to display a moving chart. This works much more painless than with the stripchart, but now I got another problem with drawing the plots.
I´m deleting all plots and then adding new ones. Then I call RefreshGraph() and the new plot is drawn, but also is the old plot (see the screenshot)!? If I resize the graph only the current plot is drawn.
Why is this so? Is this a bug? How can I work around it?
Solved!
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Attachments:
Fehler Graph Zeichnen.jpg ‏467 KB

Answer 1

I don´t know if I understood you right.
This is a stripped down example of the code I use:
// Graph nicht zeichnen
SetCtrlAttribute(panel->panelHandle,g_scGraphContr​olIds[CTRL_GRAPH_CHART],ATTR_REFRESH_GRAPH,0);
// alte Plots entfernen
DeleteGraphPlot(panel->panelHandle,g_scGraphContro​lIds[CTRL_GRAPH_CHART],-1,VAL_IMMEDIATE_DRAW);
// aktive Y- Achse setzen
SetCtrlAttribute(panel->panelHandle,g_scGraphContr​olIds[CTRL_GRAPH_CHART],ATTR_ACTIVE_YAXIS,VAL_RIGH​T_YAXIS);
// Plots eintragen
for(int sensor = 0; sensor < 8; sensor++)
int colorTrace;
int colorMinMax;
// Farben festlegen
if(panel->showTrace[sensor])
colorTrace = g_GraphTraceColors[sensor];
if(panel->showMinMax[sensor])
colorMinMax = g_GraphTraceColors[sensor];
else
colorMinMax = VAL_TRANSPARENT;
else
colorTrace = VAL_TRANSPARENT;
colorMinMax = VAL_TRANSPARENT;
// Value Plot zeichnen
panel->plotHandle[sensor * 3] = PlotXY(panel->panelHandle,g_scGraphControlIds[CTRL​_GRAPH_CHART],g_sGraphXBuffer,valueBuffer[sensor],​numPointsChart,VAL_INTEGER,VAL_DOUBLE,g_GraphLineT​hickness,VAL_NO_POINT,VAL_SOLID,1,colorTrace);
// Min Plot zeichnen
panel->plotHandle[sensor * 3 + 1] = PlotXY(panel->panelHandle,g_scGraphControlIds[CTRL​_GRAPH_CHART],g_sGraphXBuffer,minBuffer[sensor],nu​mPointsChart,VAL_INTEGER,VAL_DOUBLE,g_GraphLineThi​ckness,VAL_NO_POINT,VAL_SOLID,1,colorMinMax);
// Max Plot zeichnen
panel->plotHandle[sensor * 3 + 2] = PlotXY(panel->panelHandle,g_scGraphControlIds[CTRL​_GRAPH_CHART],g_sGraphXBuffer,maxBuffer[sensor],nu​mPointsChart,VAL_INTEGER,VAL_DOUBLE,g_GraphLineThi​ckness,VAL_NO_POINT,VAL_SOLID,1,colorMinMax);
// Graph zeichnen
SetCtrlAttribute(panel->panelHandle,g_scGraphContr​olIds[CTRL_GRAPH_CHART],ATTR_REFRESH_GRAPH,1);
RefreshGraph(panel->panelHandle,g_scGraphControlId​s[CTRL_GRAPH_CHART]);
 As said, if I replace the "VAL_IMMEDIATE_DRAW" with "VAL_DELAYED_DRAW" the old plots are drawn until I resize teh graph.
As I see it, I´m not reusing the plot handles, but getting new ones for every change (of the data) I make.