I need to label my contours with floating point values. However, I seem
to get strange results.
I have a simplified example of what occurs in the program below. It
draws an ellipse with contour value 1.0e10, i.e. x*x/4 + y*y = 1.0e10.
The contour is good. The label is written as 1.0?#???10 where ? stands
for a character I cannot recognise in this context. What am I doing wrong?
/* Test of labelling contours by floats */
#include "plplot.h"
double xMin,xMax,yMin,yMax,dx,dy;
double f(double x, double y)
{
return x*x/4 + y*y;
}
void transform(double i, double j, double *x, double *y, void *psiData)
{
*x = xMin + i*dx; *y = yMin + j*dy;
}
int main()
{
int i,j,m,n,nLevels= 1;
double x,y,**z;
double pLevels[] = {1.0e10};
m = 32; n = 16;
xMin = -2.5e5; xMax = 2.5e5; yMin = -1.5e5; yMax =1.5e5;
dx = (xMax-xMin)/m; dy = (yMax-yMin)/n;
plAlloc2dGrid(&z,m+1,n+1);
for(i=0; i <= m; i++) for(j=0; j <= n; j++)
{
transform(i,j,&x,&y,NULL); z[i][j] = f(x,y);
}
plsfnam("Labelling.ps"); plsori(1);plsdev("ps");plinit();
plenv(xMin,xMax,yMin,yMax,1,0);
pl_setcontlabelformat(1,2); pl_setcontlabelparam(0.01,0.5,0.3,1);
plcont((PLFLT_MATRIX)z,m+1,n+1,1,m,1,n,pLevels,nLevels,transform,NULL);
pllab("x","y","Ellipse");
plFree2dGrid(z,m+1,n+1);
plend();
return 1;
}
--
Peter Williams
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