/*@C
PetscDrawIndicatorFunction - Draws an indicator function (where a relationship is true) on a PetscDraw
Not collective
Input Parameter:
+ draw - a PetscDraw
. xmin,xmax,ymin,ymax - region to draw indicator function
- f - the indicator function
Level: developer
@*/
PetscErrorCode PetscDrawIndicatorFunction(PetscDraw draw, PetscReal xmin, PetscReal xmax, PetscReal ymin, PetscReal ymax,int c,PetscErrorCode (*f)(void*,PetscReal,PetscReal,PetscBool*),void *ctx)
{
PetscInt xstart,ystart,xend,yend,i,j,tmp;
PetscErrorCode ierr;
PetscReal x,y;
PetscBool isnull,flg;
PetscFunctionBegin;
PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1);
ierr = PetscObjectTypeCompare((PetscObject)draw,PETSC_DRAW_NULL,&isnull);CHKERRQ(ierr);
if (isnull) PetscFunctionReturn(0);
ierr = PetscDrawCoordinateToPixel(draw,xmin,ymin,&xstart,&ystart);CHKERRQ(ierr);
ierr = PetscDrawCoordinateToPixel(draw,xmax,ymax,&xend,¥d);CHKERRQ(ierr);
if (yend < ystart) {
tmp = ystart;
ystart = yend;
yend = tmp;
}
for (i=xstart; i<xend+1; i++) {
for (j=ystart; j<yend+1; j++) {
ierr = PetscDrawPixelToCoordinate(draw,i,j,&x,&y);CHKERRQ(ierr);
ierr = f(ctx,x,y,&flg);CHKERRQ(ierr);
if (flg) {
ierr = PetscDrawPointPixel(draw,i,j,c);CHKERRQ(ierr);
}
}
}
PetscFunctionReturn(0);
}
int main(int argc,char **argv)
{
PetscDraw draw;
PetscErrorCode ierr;
int i,j,w,h;
int k = PETSC_DRAW_BLACK;
int r = PETSC_DRAW_RED;
int g = PETSC_DRAW_GREEN;
int b = PETSC_DRAW_BLUE;
int y = PETSC_DRAW_YELLOW;
int c0 = PETSC_DRAW_BASIC_COLORS;
int c2 = 255;
int c1 = (c0+c2)/2;
ierr = PetscInitialize(&argc,&argv,NULL,help);CHKERRQ(ierr);
ierr = PetscDrawCreate(PETSC_COMM_WORLD,0,"Draw Example",PETSC_DECIDE,PETSC_DECIDE,101,101,&draw);CHKERRQ(ierr);
/*ierr = PetscDrawSetPause(draw,2.0);CHKERRQ(ierr);*/
ierr = PetscDrawSetFromOptions(draw);CHKERRQ(ierr);
ierr = PetscDrawCheckResizedWindow(draw);CHKERRQ(ierr);
ierr = PetscDrawGetWindowSize(draw,&w,&h);CHKERRQ(ierr);
ierr = PetscDrawSetCoordinates(draw,0,0,--w,--h);CHKERRQ(ierr);
ierr = PetscDrawClear(draw);CHKERRQ(ierr);
/* one-pixel lines in the window corners */
ierr = PetscDrawLine(draw,0,0,0,0,r);CHKERRQ(ierr);
ierr = PetscDrawLine(draw,w,0,w,0,r);CHKERRQ(ierr);
ierr = PetscDrawLine(draw,0,h,0,h,r);CHKERRQ(ierr);
ierr = PetscDrawLine(draw,w,h,w,h,r);CHKERRQ(ierr);
/* border lines with two pixels from borders */
ierr = PetscDrawLine(draw,0+2,0,w-2,0,k);CHKERRQ(ierr);
ierr = PetscDrawLine(draw,0+2,h,w-2,h,k);CHKERRQ(ierr);
ierr = PetscDrawLine(draw,0,0+2,0,h-2,k);CHKERRQ(ierr);
ierr = PetscDrawLine(draw,w,0+2,w,h-2,k);CHKERRQ(ierr);
/* oblique lines */
ierr = PetscDrawLine(draw,0+2,h/2,w-2,h-2,b);CHKERRQ(ierr);
ierr = PetscDrawLine(draw,0+1,h-1,w-1,0+1,b);CHKERRQ(ierr);
/* vertical up and down arrow, two pixels from borders */
ierr = PetscDrawArrow(draw,1*w/4,0+2,1*w/4,h-2,g);CHKERRQ(ierr);
ierr = PetscDrawArrow(draw,3*w/4,h-2,3*w/4,0+2,g);CHKERRQ(ierr);
/* horizontal right and left arrow, two pixels from borders */
ierr = PetscDrawArrow(draw,0+2,3*h/4,w-2,3*h/4,g);CHKERRQ(ierr);
ierr = PetscDrawArrow(draw,w-2,1*h/4,0+2,1*h/4,g);CHKERRQ(ierr);
/* flush, save, and pause */
ierr = PetscDrawFlush(draw);CHKERRQ(ierr);
ierr = PetscDrawSave(draw);CHKERRQ(ierr);
ierr = PetscDrawPause(draw);CHKERRQ(ierr);
ierr = PetscDrawCheckResizedWindow(draw);CHKERRQ(ierr);
ierr = PetscDrawGetWindowSize(draw,&w,&h);CHKERRQ(ierr);
ierr = PetscDrawSetCoordinates(draw,0,0,--w,--h);CHKERRQ(ierr);
ierr = PetscDrawClear(draw);CHKERRQ(ierr);
/* one-pixel rectangles in the window corners */
ierr = PetscDrawRectangle(draw,0,0,0,0,k,k,k,k);CHKERRQ(ierr);
ierr = PetscDrawRectangle(draw,w,0,w,0,k,k,k,k);CHKERRQ(ierr);
ierr = PetscDrawRectangle(draw,0,h,0,h,k,k,k,k);CHKERRQ(ierr);
ierr = PetscDrawRectangle(draw,w,h,w,h,k,k,k,k);CHKERRQ(ierr);
/* border rectangles with two pixels from borders */
ierr = PetscDrawRectangle(draw,0+2,0,w-2,0,k,k,k,k);CHKERRQ(ierr);
ierr = PetscDrawRectangle(draw,0+2,h,w-2,h,k,k,k,k);CHKERRQ(ierr);
ierr = PetscDrawRectangle(draw,0,0+2,0,h-2,k,k,k,k);CHKERRQ(ierr);
ierr = PetscDrawRectangle(draw,w,0+2,w,h-2,k,k,k,k);CHKERRQ(ierr);
/* more rectangles */
ierr = PetscDrawRectangle(draw,0+2,0+2,w/2-1,h/2-1,b,b,b,b);CHKERRQ(ierr);
ierr = PetscDrawRectangle(draw,0+2,h/2+1,w/2-1,h-2,r,r,r,r);CHKERRQ(ierr);
ierr = PetscDrawRectangle(draw,w/2+1,h/2+1,w-2,h-2,g,g,g,g);CHKERRQ(ierr);
ierr = PetscDrawRectangle(draw,w/2+1,0+2,w-2,h/2-1,y,y,y,y);CHKERRQ(ierr);
/* flush, save, and pause */
ierr = PetscDrawFlush(draw);CHKERRQ(ierr);
ierr = PetscDrawSave(draw);CHKERRQ(ierr);
ierr = PetscDrawPause(draw);CHKERRQ(ierr);
ierr = PetscDrawCheckResizedWindow(draw);CHKERRQ(ierr);
ierr = PetscDrawGetWindowSize(draw,&w,&h);CHKERRQ(ierr);
ierr = PetscDrawSetCoordinates(draw,0,0,--w,--h);CHKERRQ(ierr);
ierr = PetscDrawClear(draw);CHKERRQ(ierr);
/* interpolated triangles, one pixel from borders */
ierr = PetscDrawTriangle(draw,0+1,0+1,w-1,0+1,w-1,h-1,c0,c1,c2);CHKERRQ(ierr);
ierr = PetscDrawTriangle(draw,0+1,0+1,0+1,h-1,w-1,h-1,c0,c1,c2);CHKERRQ(ierr);
/* interpolated triangle, oblique, inside canvas */
ierr = PetscDrawTriangle(draw,w/4,h/4,w/2,3*h/4,3*w/4,h/2,c2,c1,c0);CHKERRQ(ierr);
/* flush, save, and pause */
ierr = PetscDrawFlush(draw);CHKERRQ(ierr);
ierr = PetscDrawSave(draw);CHKERRQ(ierr);
ierr = PetscDrawPause(draw);CHKERRQ(ierr);
ierr = PetscDrawCheckResizedWindow(draw);CHKERRQ(ierr);
ierr = PetscDrawGetWindowSize(draw,&w,&h);CHKERRQ(ierr);
ierr = PetscDrawSetCoordinates(draw,0,0,--w,--h);CHKERRQ(ierr);
ierr = PetscDrawClear(draw);CHKERRQ(ierr);
/* circles and ellipses */
ierr = PetscDrawEllipse(draw,w/2,h/2,w-1,h-1,r);CHKERRQ(ierr);
ierr = PetscDrawEllipse(draw,w,h/2,w/2,h,g);CHKERRQ(ierr);
ierr = PetscDrawEllipse(draw,0,0,w,h/2,b);CHKERRQ(ierr);
ierr = PetscDrawEllipse(draw,w/4,3*h/4,w/2,h/4,y);CHKERRQ(ierr);
ierr = PetscDrawCoordinateToPixel(draw,w/2,h/2,&i,&j);CHKERRQ(ierr);
ierr = PetscDrawPointPixel(draw,i,j,k);CHKERRQ(ierr);
/* flush, save, and pause */
ierr = PetscDrawFlush(draw);CHKERRQ(ierr);
ierr = PetscDrawSave(draw);CHKERRQ(ierr);
ierr = PetscDrawPause(draw);CHKERRQ(ierr);
ierr = PetscDrawDestroy(&draw);CHKERRQ(ierr);
ierr = PetscFinalize();
return 0;
}