www.pudn.com > CG2Programs.rar > lineChartStyles.c

/* lineChartStyles, Chapter 4, p. 145 */

/* EXAMPLE STARTS HERE */
#include 
#include "graphics.h"

#define MARGIN_WIDTH 0.05 * WINDOW_WIDTH

int readData (char * inFile, float * data)
{
  int fileError = FALSE;
  FILE * fp;
  int month;

  if ((fp = fopen (inFile, "r")) == NULL)
    fileError = TRUE;
  else {
    for (month=0; month<12; month++) 
      fscanf (fp, "%f", &data[month]);
    fclose (fp);
  }
  return (fileError);
}

void chartData (float * data, pLineType lineType)
{
  wcPt2 pts[12];
  float monthWidth = (WINDOW_WIDTH - 2 * MARGIN_WIDTH) / 12;
  int i;
  
  for (i=0; i<12; i++) {
    pts[i].x = MARGIN_WIDTH + i * monthWidth + 0.5 * monthWidth;
    pts[i].y = data[i];
  }
  pSetLineType (lineType);
  pPolyline (12, pts);
}

int main (int argc, char ** argv)
{
  long windowID = openGraphics (*argv, WINDOW_WIDTH, WINDOW_HEIGHT);
  float data[12];

  setBackground (WHITE);
  setColor (BLUE);
  readData ("../data/data1960", data);
  chartData (data, SOLID);
  readData ("../data/data1970", data);
  chartData (data, DASHED);
  readData ("../data/data1980", data);
  chartData (data, DOTTED);
  sleep (10);
  closeGraphics (windowID);
}
/* EXAMPLE ENDS HERE */