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: }