Date: 2022-03-04T17:37:01+00:00

Actual source code: drect.c

      2: /*
      3:        Provides the calling sequences for all the basic PetscDraw routines.
      4: */
      5: #include <petsc/private/drawimpl.h>

      7: /*@C
      8:    PetscDrawIndicatorFunction - Draws an indicator function (where a relationship is true) on a PetscDraw

     10:    Not collective

     12:    Input Parameters:
     13: +  draw - a PetscDraw
     14: .  xmin,xmax,ymin,ymax - region to draw indicator function
     15: -  f - the indicator function

     17:    Level: developer

     19: @*/
     20: PetscErrorCode PetscDrawIndicatorFunction(PetscDraw draw,PetscReal xmin,PetscReal xmax,PetscReal ymin,PetscReal ymax,int c,PetscErrorCode (*indicator)(void*,PetscReal,PetscReal,PetscBool*),void *ctx)
     21: {
     22:   int            i,j,xstart,ystart,xend,yend;
     23:   PetscReal      x,y;
     24:   PetscBool      isnull,flg;

     29:   PetscDrawIsNull(draw,&isnull);
     30:   if (isnull) return(0);

     32:   PetscDrawCoordinateToPixel(draw,xmin,ymin,&xstart,&ystart);
     33:   PetscDrawCoordinateToPixel(draw,xmax,ymax,&xend,&yend);
     34:   if (yend < ystart) { PetscInt tmp = ystart; ystart = yend; yend = tmp; }

     36:   for (i=xstart; i<=xend; i++) {
     37:     for (j=ystart; j<=yend; j++) {
     38:       PetscDrawPixelToCoordinate(draw,i,j,&x,&y);
     39:       indicator(ctx,x,y,&flg);
     40:       if (flg) {
     41:         PetscDrawPointPixel(draw,i,j,c);
     42:       }
     43:     }
     44:   }
     45:   return(0);
     46: }

     48: /*@C
     49:    PetscDrawCoordinateToPixel - given a coordinate in a PetscDraw returns the pixel location

     51:    Not collective

     53:    Input Parameters:
     54: +  draw - the draw where the coordinates are defined
     55: .  x - the horizontal coordinate
     56: -  y - the vertical coordinate

     58:    Output Parameters:
     59: +  i - the horizontal pixel location
     60: -  j - the vertical pixel location

     62:    Level: developer

     64: @*/
     65: PetscErrorCode PetscDrawCoordinateToPixel(PetscDraw draw,PetscReal x,PetscReal y,int *i,int *j)
     66: {

     71:   if (!draw->ops->coordinatetopixel) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"This draw type %s does not support locating pixels",((PetscObject)draw)->type_name);
     72:   (*draw->ops->coordinatetopixel)(draw,x,y,i,j);
     73:   return(0);
     74: }

     76: /*@C
     77:    PetscDrawPixelToCoordinate - given a pixel in a PetscDraw returns the coordinate

     79:    Not collective

     81:    Input Parameters:
     82: +  draw - the draw where the coordinates are defined
     83: .  i - the horizontal pixel location
     84: -  j - the vertical pixel location

     86:    Output Parameters:
     87: +  x - the horizontal coordinate
     88: -  y - the vertical coordinate

     90:    Level: developer

     92: @*/
     93: PetscErrorCode PetscDrawPixelToCoordinate(PetscDraw draw,int i,int j,PetscReal *x,PetscReal *y)
     94: {

     99:   if (!draw->ops->pixeltocoordinate) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"This draw type %s does not support locating coordinates",((PetscObject)draw)->type_name);
    100:   (*draw->ops->pixeltocoordinate)(draw,i,j,x,y);
    101:   return(0);
    102: }

    104: /*@
    105:    PetscDrawRectangle - PetscDraws a rectangle  onto a drawable.

    107:    Not Collective

    109:    Input Parameters:
    110: +  draw - the drawing context
    111: .  xl,yl,xr,yr - the coordinates of the lower left, upper right corners
    112: -  c1,c2,c3,c4 - the colors of the four corners in counter clockwise order

    114:    Level: beginner

    116: .seealso: PetscDrawLine(), PetscDrawRectangle(), PetscDrawTriangle(), PetscDrawEllipse(),
    117:           PetscDrawMarker(), PetscDrawPoint(), PetscDrawString(), PetscDrawPoint(), PetscDrawArrow()

    119: @*/
    120: PetscErrorCode  PetscDrawRectangle(PetscDraw draw,PetscReal xl,PetscReal yl,PetscReal xr,PetscReal yr,int c1,int c2,int c3,int c4)
    121: {

    126:   if (!draw->ops->rectangle) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"This draw type %s does not support drawing rectangles",((PetscObject)draw)->type_name);
    127:   (*draw->ops->rectangle)(draw,xl,yl,xr,yr,c1,c2,c3,c4);
    128:   return(0);
    129: }