/*@C
PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array
that is stored as a PETSc vector.
Collective on PetscDraw, but PetscDraw must be sequential
Input Parameters:
+ win - the window to draw in
. m,n - the global number of mesh points in the x and y directions
. xi,yi - the locations of the global mesh points (optional, use PETSC_NULL
to indicate uniform spacing on [0,1])
- V - the values
Options Database Keys:
+ -draw_x_shared_colormap - Indicates use of private colormap
- -draw_contour_grid - PetscDraws grid contour
Level: intermediate
Concepts: contour plot
Concepts: drawing^contour plot
.seealso: PetscDrawTensorContourPatch()
@*/
PetscErrorCode PetscDrawTensorContour(PetscDraw win,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v)
{
PetscErrorCode ierr;
int N = m*n;
PetscBool isnull;
PetscDraw popup;
MPI_Comm comm;
int xin=1,yin=1,i;
PetscMPIInt size;
PetscReal h;
ZoomCtx ctx;
PetscFunctionBegin;
ierr = PetscDrawIsNull(win,&isnull);CHKERRQ(ierr); if (isnull) PetscFunctionReturn(0);
ierr = PetscObjectGetComm((PetscObject)win,&comm);CHKERRQ(ierr);
ierr = MPI_Comm_size(comm,&size);CHKERRQ(ierr);
if (size > 1) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"May only be used with single processor PetscDraw");
if (N <= 0) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"n %d and m %d must be positive",m,n);
/* create scale window */
ierr = PetscDrawGetPopup(win,&popup);CHKERRQ(ierr);
ierr = PetscDrawCheckResizedWindow(win);CHKERRQ(ierr);
ctx.v = v;
ctx.m = m;
ctx.n = n;
ctx.max = ctx.min = v[0];
for (i=0; i<N; i++) {
if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i];
if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i];
}
if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;}
/* PetscDraw the scale window */
if (popup) {ierr = PetscDrawScalePopup(popup,ctx.min,ctx.max);CHKERRQ(ierr);}
ctx.showgrid = PETSC_FALSE;
ierr = PetscOptionsGetBool(PETSC_NULL,"-draw_contour_grid",&ctx.showgrid,PETSC_NULL);CHKERRQ(ierr);
/* fill up x and y coordinates */
if (!xi) {
xin = 0;
ierr = PetscMalloc(ctx.m*sizeof(PetscReal),&ctx.x);CHKERRQ(ierr);
h = 1.0/(ctx.m-1);
ctx.x[0] = 0.0;
for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h;
} else {
ctx.x = (PetscReal*)xi;
}
if (!yi) {
yin = 0;
ierr = PetscMalloc(ctx.n*sizeof(PetscReal),&ctx.y);CHKERRQ(ierr);
h = 1.0/(ctx.n-1);
ctx.y[0] = 0.0;
for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h;
} else {
ctx.y = (PetscReal *)yi;
}
ierr = PetscDrawZoom(win,(PetscErrorCode (*)(PetscDraw,void *))PetscDrawTensorContour_Zoom,&ctx);CHKERRQ(ierr);
if (!xin) {ierr = PetscFree(ctx.x);CHKERRQ(ierr);}
if (!yin) {ierr = PetscFree(ctx.y);CHKERRQ(ierr);}
PetscFunctionReturn(0);
}
void PETSC_STDCALL petscdrawgetpopup_(PetscDraw draw,PetscDraw *popup, int *__ierr ){
*__ierr = PetscDrawGetPopup(
(PetscDraw)PetscToPointer((draw) ),popup);
}