Displaying one curve and a specific point.

Sadbrute · Post by **Sadbrute** » Thu May 19, 2011 4:37 pm

Do you have a small code snipplet (in C++) on how to draw an arrow that points on a spot (point) on a graph?
With the arrow, dotted lines that goes on the respective coordinates (X,Y) of that specefic point on the graph .

THX!

Sadbrute · Post by **Sadbrute** » Fri May 20, 2011 9:53 am

Here is some code but i get processing error [Activate(2)] and does not work at all i get a striaight line,instaed of a curve and the doted lines are supposed to be "square" on the axis'.

Code: Select all

memset(&dplot_,0,sizeof(dplot_));
	dplot_.Version		= DPLOT_DDE_VERSION;
	dplot_.DataFormat	= DATA_DXY;
	dplot_.hwnd=(DWORD)GetDlgItem(hwnd_,id_);
	dplot_.MaxCurves		= 2;	// Must be >= number of curves we plot
	dplot_.MaxPoints		= 2*calcul->GetNbPoints();	// Anything >= NP will do
	dplot_.NumCurves		= 2;
	dplot_.Scale			= SCALE_LINEARX_LINEARY;
	dplot_.LegendX		= 0;
	dplot_.LegendY		= 0;
	dplot_.NP[0]		= 3;
	

	//legend stuff no problem there....
	
		

	
		strcpy(dplot_.Title[0],info->name);
	strcpy(dplot_.XAxis,info->unit);
	strcpy(dplot_.YAxis,"Celscius");
		
	sprintf(szExec,"[Color(2,255,0,0)][LineWidth(2,20)]");
	dplot_.NP[1]= calcul->GetNbPoints();
	dplot_.LineType[1]	= LINESTYLE_SOLID;

	for (int i=0;i<calcul->GetNbPoints();++i)
	{
		y[i+3]=tab[i].Y;
		x[i+3]=calcul->GetX(i)*1000;
	}
	
	char guedille=34;
	//guedille=34;
	x[0] =2600;
	y[0] = 0;
	x[1] =2600;
	y[1] = Value;
	x[2]=0;
	y[2]=Value;
	strcat(szExec,"[Color(1,0,0,0)] [LineWidth(1,20)]");
	dplot_.LineType[0]  =LINESTYLE_DOTTED;
	strcat(szExec,"[SelectCurve(1)][TextPointLabel(2,1000,50,0,0,8,");
		strcat(szExec,"\"1500\"");
		strcat(szExec,")]");


	
	strcat(szExec,"[LegendParams(0.1,5,1");
	if(CalculManager::GetInstance().IsLegendOpaqueShown())
		strcat(szExec,",1)]");
	else
		strcat(szExec,",0)]");

		strcat(szExec,"[ClearEditFlag()]");

P.S. X array and Y array are valid

Sadbrute · Post by **Sadbrute** » Fri May 20, 2011 11:29 am

Ok i have fixed the Activate(2) problem. I have a plot of 3 points.

it should give me a rectangle with the axis instead i have this:

aaa/--------------
aa/
a /
/

With this code:

Code: Select all

memset(&dplot_,0,sizeof(dplot_));
	dplot_.Version		= DPLOT_DDE_VERSION;
	dplot_.DataFormat	= DATA_DXY;
	dplot_.hwnd=(DWORD)GetDlgItem(hwnd_,id_);
	dplot_.MaxCurves		= 1;	// Must be >= number of curves we plot
	dplot_.MaxPoints		= 3;//2*calcul->GetNbPoints();	// Anything >= NP will do
	dplot_.NumCurves		= 1;
	dplot_.Scale			= SCALE_LINEARX_LINEARY;
	dplot_.LegendX		= 0;
	dplot_.LegendY		= 0;
	dplot_.NP[0]		= 3;
                x[0] =2600.0;
	y[0] = 0;
	x[1] =2600.0;
	y[1] = PPRTable->Value;
	x[2]=2500;
	y[2]=PPRTable->Value;
	dplot_.LineType[0]  =LINESTYLE_DOTTED;
	sprintf(szExec,"[Color(1,0,255,0)]");
		
	
	strcat(szExec,"[ClearEditFlag()]");

Sadbrute · Post by **Sadbrute** » Fri May 20, 2011 12:37 pm

Ahhhhhhhhhhh X[0] determines the jumps and x[1] the start, if i want a graph with my custom points do i need to use XY macro?

Sadbrute · Post by **Sadbrute** » Fri May 20, 2011 2:51 pm

Is there a way to to point out a specific point ,like put a dot on the curve and have (doted) lines that point to it's respective XY coordinates?

P.S i know you have the TextPointLabel macro!

Post by **DPlotAdmin** » Fri May 20, 2011 3:24 pm

"if i want a graph with my custom points do i need to use XY macro?"

I'm not sure I understand your question. If your points are not even spaced in X, use DataFormat = DATA_XYXY.

"Is there a way to to point out a specific point ,like put a dot on the curve and have (doted) lines that point to it's respective XY coordinates? "

Other than point labels, no - at least not easily. You can always duplicate the important points, placing them in a different curve with a different symbol/color/size.

Sadbrute · Post by **Sadbrute** » Fri May 20, 2011 4:42 pm

NOOOOOOOOOOOOOOO! way!! Thx , wow i feel dumb....

By the way, when does the 64 bit version come out

Post by **DPlotAdmin** » Fri May 20, 2011 5:39 pm

If you're talking about dplotlib.dll... I'm working on it, and I do see the importance of this. For dplot.exe I don't, so much. I don't see much value in plotting more points than the 32-bit version will handle.

Mad2Max · Post by **Mad2Max** » Mon Feb 13, 2012 8:18 am

Hi,
I add my question to this post because it looks quite similar.
I would like to add one dot on a specific point in a curve - just one.
The problem is that I always keep getting point (0,0) besides my defined point.
Do you have any suggestion on how to get rid of it?
I attach a piece of code.
Thanks!
Max

DPlot.Version = DPLOT_DDE_VERSION;
DPlot.DataFormat = DATA_XYXY;
DPlot.MaxCurves = 2;
DPlot.MaxPoints = NP;
DPlot.NumCurves = 2;
DPlot.Scale = SCALE_LINEARX_LINEARY;
DPlot.LegendX = 0.01f;
DPlot.LegendY = 0.02f;
DPlot.NP[0] = NP;
DPlot.NP[1] = 1;
DPlot.LineType[0] = LINESTYLE_SOLID;
DPlot.LineType[1] = LINESTYLE_NONE;
DPlot.SymbolType[0] = SYMBOLSTYLE_NONE;
DPlot.SymbolType[1] = SYMBOLSTYLE_ASTERISK;

//First curve
DocNum = dPlot_Plot8(&DPlot,x,y,"[DocMaximize()]""[ClearEditFlag()]");
DPlot_Command(DocNum, total_string);
DPlot_Command(DocNum,"[ManualScale(0,,27,,)][ClearEditFlag()]");

//just one point
x1[0]=5.0;
y1[0]=8;
ret = DPlot_AddData8(DocNum, DATA_XYXY, 1, 2, x1, y1);

Post by **DPlotAdmin** » Mon Feb 13, 2012 8:35 am

Your initial call to dPlot_Plot8 has DPlot.NumCurves=2, but you don't have the 2nd "curve" to add yet. dPlot_Plot8 will add a curve with whatever values happen to be stored in your x and y arrays after the end of your first curve - in this case 0,0.

Set DPlot.NumCurves=1 and I think you'll get the expected results.

Mad2Max · Post by **Mad2Max** » Mon Feb 13, 2012 12:36 pm

Thank you for your answer, you've made my thoughts clearer.
At last DPlot_AddData wasn't the smartest way for my needs and I switched to add the dot on the first curve by adding it to the first vector plotted by dPlot_Plot8.