Can C programming plot a graph?

[snee]

plot graph c++

How can C programming plot a graph?
Using what function or command?
Thanks

 

[davidgrm]

graphing in c

The 'standard c' language does not have graphing functions. This will also be very dependent on the operating system or device that will display the graph. This kind of functionality will normally be provided as an additional library or API call depending on the compiler / operating system. I suggest that you provide more details regarding Operating system / compiler / cpu etc.
With 'c' you can always write your own or perhaps find something already written on the net

 

[Nahian]

plot graph in c++

How can C programming plot a graph?
Using what function or command?
Thanks

Better if u use Mathlab.Or Interface graphic lcd by parallel port ...

 

[shawan44]

c++ plot graph

i use it in c++ & use graphics.h include file

 

[hash3d]

plot graphs in c

you can plot an ascii graph
depends on what you need
yet, better use c++ or even matlab if you need good accuracy

 

[Old Nick]

graph in c language

you can plot an ascii graph
depends on what you need
yet, better use c++ or even matlab if you need good accuracy

Straight C is as good as C++ for this, but as mentioned it is not part of the standard C language. However if you programming for the Windows OS, there are plenty of functions to create graphics suitable for graphing. I've done this myself in Straight C.

The fuction below draws four traces, (voltages read by an ADC card), and is written in straight C - for Windows. Using miscrosofts visual C compiler

void drawGraph (HWND hwnd, HDC hdc)
{
	//255-150*(g_dataArrayA[i][j]+1)
	int xAxis[9] = {-180,-150,-120,-90,0,90,120,150,180};
	//float g_yAxis[8] = {0,0.5,1.0,1.5,2.0,2.5,3.0,3.5};
	int i=0;
	HPEN	hPenOld, hPenA, hPenB, hPenC, hPenD;

	MoveToEx(hdc, graphOffset, 0, NULL);
	LineTo(hdc, graphOffset+((360/amount)*(int)floor((16200*amount)/360)), 0);
	

	MoveToEx(hdc, graphOffset+((180/amount)*(int)floor((16200*amount)/360)), 0, NULL);
	LineTo(hdc, graphOffset+((180/amount)*(int)floor((16200*amount)/360)), (int)(g_yAxis[7]*scaleData));

	MoveToEx(hdc, graphOffset, (int)(g_yAxis[1]*scaleData), NULL);
	LineTo(hdc, graphOffset+((360/amount)*(int)floor((16200*amount)/360)), (int)(g_yAxis[1]*scaleData));
	MoveToEx(hdc, graphOffset, (int)(g_yAxis[2]*scaleData), NULL);
	LineTo(hdc, graphOffset+((360/amount)*(int)floor((16200*amount)/360)), (int)(g_yAxis[2]*scaleData));
	MoveToEx(hdc, graphOffset, (int)(g_yAxis[3]*scaleData), NULL);
	LineTo(hdc, graphOffset+((360/amount)*(int)floor((16200*amount)/360)), (int)(g_yAxis[3]*scaleData));
	MoveToEx(hdc, graphOffset, (int)(g_yAxis[4]*scaleData), NULL);
	LineTo(hdc, graphOffset+((360/amount)*(int)floor((16200*amount)/360)), (int)(g_yAxis[4]*scaleData));
	MoveToEx(hdc, graphOffset, (int)(g_yAxis[5]*scaleData), NULL);
	LineTo(hdc, graphOffset+((360/amount)*(int)floor((16200*amount)/360)), (int)(g_yAxis[5]*scaleData));
	MoveToEx(hdc, graphOffset, (int)(g_yAxis[6]*scaleData), NULL);
	LineTo(hdc, graphOffset+((360/amount)*(int)floor((16200*amount)/360)), (int)(g_yAxis[6]*scaleData));
	hPenA=CreatePen(PS_SOLID,30,RGB(0,255,0));
	hPenB=CreatePen(PS_SOLID,30,RGB(255,0,00));
	hPenC=CreatePen(PS_SOLID,30,RGB(0,0,255));
	hPenD=CreatePen(PS_SOLID,30,RGB(255,255,0));
	hPenOld = SelectObject(hdc, hPenA);



	if (g_i>1 && g_i<=(int)(360/amount))//paint the individual points
	{
		
		MoveToEx(hdc, graphOffset+((g_i-1)*(int)floor((16200*amount)/360)), ((g_aAverage[g_i-1])), NULL);
		SelectObject(hdc, hPenA);
		LineTo(hdc, graphOffset+((g_i)*(int)floor((16200*amount)/360)), (g_aAverage[g_i]));
		MoveToEx(hdc, graphOffset+((g_i-1)*(int)floor((16200*amount)/360)), ((g_bAverage[g_i-1])), NULL);
		SelectObject(hdc, hPenB);
		LineTo(hdc, graphOffset+((g_i)*(int)floor((16200*amount)/360)), ((g_bAverage[g_i])));
		MoveToEx(hdc, graphOffset+((g_i-1)*(int)floor((16200*amount)/360)), ((g_cAverage[g_i-1])), NULL);
		SelectObject(hdc, hPenC);
		LineTo(hdc, graphOffset+((g_i)*(int)floor((16200*amount)/360)), ((g_cAverage[g_i])));
		MoveToEx(hdc, graphOffset+((g_i-1)*(int)floor((16200*amount)/360)), ((g_dAverage[g_i-1])), NULL);
		SelectObject(hdc, hPenD);
		LineTo(hdc, graphOffset+((g_i)*(int)floor((16200*amount)/360)), ((g_dAverage[g_i])));
	}
	else if (g_i>=(int)(360/amount)) //repaints the entire graph so as it is not lost to future repaints
	{
		for (i=1;i<=(int)(360/amount);i++)
		{	
			if (i>1)
			{
				MoveToEx(hdc, graphOffset+((i-1)*(int)floor((16200*amount)/360)), ((g_aAverage[i-1])), NULL);
				SelectObject(hdc, hPenA);
				LineTo(hdc, graphOffset+((i)*(int)floor((16200*amount)/360)), ((g_aAverage[i])));
				MoveToEx(hdc, graphOffset+((i-1)*(int)floor((16200*amount)/360)), ((g_bAverage[i-1])), NULL);
				SelectObject(hdc, hPenB);
				LineTo(hdc, graphOffset+((i)*(int)floor((16200*amount)/360)), ((g_bAverage[i])));
				MoveToEx(hdc, graphOffset+((i-1)*(int)floor((16200*amount)/360)), ((g_cAverage[i-1])), NULL);
				SelectObject(hdc, hPenC);
				LineTo(hdc, graphOffset+((i)*(int)floor((16200*amount)/360)), ((g_cAverage[i])));
				MoveToEx(hdc, graphOffset+((i-1)*(int)floor((16200*amount)/360)), ((g_dAverage[i-1])), NULL);
				SelectObject(hdc, hPenD);
				LineTo(hdc, graphOffset+((i)*(int)floor((16200*amount)/360)), ((g_dAverage[i])));
			}
		}
	}
	SelectObject(hdc, hPenOld);
	DeleteObject(hPenA);
	DeleteObject(hPenB);
	DeleteObject(hPenC);
	DeleteObject(hPenD);
}

 

[zlatkoMM]

c plot graph

Or you can use very good OSC_dll programming library