Example code snippet that creates the bar graph below.
//code snippet shows how a color bar graph is created grLibSetGraphParams(br,10,15,140,100,BAR,col); //specify the scales (max and min X and Y) - these are the data ranges grLibSetMaxMinScales(br,0,1999,100,2004); //draw an outer frame for the graph. This routine will use the frame //parameters set in grLibSetGraphParams grLibDrawGraphFrame(br,SIMPLE_FRAME); //start inputting data! if( grLibInputGraphData(br,25,2002,0,"Yahoo") != grLibNone) return grLibInvData; if( grLibInputGraphData(br,50,2003,1,"Lycos") != grLibNone) return grLibInvData; if( grLibInputGraphData(br,75,2001,2,"MSN") !=grLibNone) return grLibInvData; if( grLibInputGraphData(br,90,2002,3,"Redif") !=grLibNone) return grLibInvData;
//draw the legends first, print them in rows of 3 columns each.
grLibDrawGraphLegends(&appgr,3);
//draw the gray line vertical grids originating from X axis. Also print
//the scale values on the Y axis. '5' specifies how many grids to draw
grLibDrawGraphGrids(&appgr,YGRID,XTEXT,5);
//draw the gray line horizontal grids originating from Y axis. Also print
//the scale values on the X axis. '5' specifies how many grids to draw
//You can specify variables to print grids and text in variety of
//combinations (No grid, X text or no grids,no text, only X grid and so on)
//see the grid_t typedefs
grLibDrawGraphGrids(&appgr,NO_GRID,YTEXT,5);
//this will draw the graph for all the data points. You can choose to print
//only some if you wish to - using the for loop. The numDataPts is an
//internal value calculated when the data was loaded to the graph
for(idx = 0;idx < appgr.numDataPts ;idx++)
grLibDrawGraph(&appgr,idx);
grLibDrawGraphTitle(&appgr,"ISP Turnover");
Of course, using some of the code above in different ways - you choose some of the below formats as well
- Black and White
- No title
- No legends
- No grids
- More grids (Y or X or both XY axis)
- so on...
Creating other graphs is equally simple.