Actual source code: drect.c

petsc-3.5.2 2014-09-08
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  2: /*
  3:        Provides the calling sequences for all the basic PetscDraw routines.
  4: */
  5: #include <petsc-private/drawimpl.h>  /*I "petscdraw.h" I*/


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

 13:    Not collective

 15:    Input Parameter:
 16: +  draw - a PetscDraw
 17: .  xmin,xmax,ymin,ymax - region to draw indicator function
 18: -  f - the indicator function

 20:    Level: developer

 22: @*/
 23: PetscErrorCode PetscDrawIndicatorFunction(PetscDraw draw, PetscReal xmin, PetscReal xmax, PetscReal ymin, PetscReal ymax,int c,PetscErrorCode (*f)(void*,PetscReal,PetscReal,PetscBool*),void *ctx)
 24: {
 25:   PetscInt       xstart,ystart,xend,yend,i,j,tmp;
 27:   PetscReal      x,y;
 28:   PetscBool      isnull,flg;

 32:   PetscObjectTypeCompare((PetscObject)draw,PETSC_DRAW_NULL,&isnull);
 33:   if (isnull) return(0);

 35:   PetscDrawCoordinateToPixel(draw,xmin,ymin,&xstart,&ystart);
 36:   PetscDrawCoordinateToPixel(draw,xmax,ymax,&xend,&yend);
 37:   if (yend < ystart) {
 38:     tmp    = ystart;
 39:     ystart = yend;
 40:     yend   = tmp;
 41:   }
 42:   for (i=xstart; i<xend+1; i++) {
 43:     for (j=ystart; j<yend+1; j++) {
 44:       PetscDrawPixelToCoordinate(draw,i,j,&x,&y);
 45:       f(ctx,x,y,&flg);
 46:       if (flg) {
 47:         PetscDrawPointPixel(draw,i,j,c);
 48:       }
 49:     }
 50:   }
 51:   return(0);
 52: }


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

 60:    Not collective

 62:    Input Parameters:
 63: +  draw - the draw where the coordinates are defined
 64: -  x,y - the coordinate location

 66:    Output Parameters:
 67: -  i,j - the pixel location

 69:    Level: developer

 71: @*/
 72: PetscErrorCode PetscDrawCoordinateToPixel(PetscDraw draw,PetscReal x,PetscReal y,PetscInt *i,PetscInt *j)
 73: {
 75:   PetscBool      isnull;

 79:   PetscObjectTypeCompare((PetscObject)draw,PETSC_DRAW_NULL,&isnull);
 80:   if (isnull) return(0);
 81:   if (!draw->ops->coordinatetopixel) SETERRQ(PetscObjectComm((PetscObject)draw),PETSC_ERR_SUP,"No support for locating pixel");
 82:   (*draw->ops->coordinatetopixel)(draw,x,y,i,j);
 83:   return(0);
 84: }

 88: /*@C
 89:    PetscDrawPixelToCoordinate - given a pixel in a PetscDraw returns the coordinate

 91:    Not collective

 93:    Input Parameters:
 94: +  draw - the draw where the coordinates are defined
 95: -  i,j - the pixel location

 97:    Output Parameters:
 98: .  x,y - the coordinate location

100:    Level: developer

102: @*/
103: PetscErrorCode PetscDrawPixelToCoordinate(PetscDraw draw,PetscInt i,PetscInt j,PetscReal *x,PetscReal *y)
104: {
106:   PetscBool      isnull;

110:   PetscObjectTypeCompare((PetscObject)draw,PETSC_DRAW_NULL,&isnull);
111:   if (isnull) return(0);
112:   if (!draw->ops->pixeltocoordinate) SETERRQ(PetscObjectComm((PetscObject)draw),PETSC_ERR_SUP,"No support for locating coordiante from ");
113:   (*draw->ops->pixeltocoordinate)(draw,i,j,x,y);
114:   return(0);
115: }

119: /*@
120:    PetscDrawRectangle - PetscDraws a rectangle  onto a drawable.

122:    Not Collective

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

129:    Level: beginner

131:    Concepts: drawing^rectangle
132:    Concepts: graphics^rectangle
133:    Concepts: rectangle

135: @*/
136: PetscErrorCode  PetscDrawRectangle(PetscDraw draw,PetscReal xl,PetscReal yl,PetscReal xr,PetscReal yr,int c1,int c2,int c3,int c4)
137: {
139:   PetscBool      isnull;

143:   PetscObjectTypeCompare((PetscObject)draw,PETSC_DRAW_NULL,&isnull);
144:   if (isnull) return(0);
145:   if (!draw->ops->rectangle) SETERRQ(PetscObjectComm((PetscObject)draw),PETSC_ERR_SUP,"No support for drawing rectangle");
146:   (*draw->ops->rectangle)(draw,xl,yl,xr,yr,c1,c2,c3,c4);
147:   return(0);
148: }

152: /*@
153:    PetscDrawSave - Saves a drawn image

155:    Not Collective

157:    Input Parameters:
158: .  draw - the drawing context

160:    Level: advanced

162:    Notes: this is not normally called by the user, it is called by PetscDrawClear_X() to save a sequence of images.

164: .seealso: PetscDrawSetSave()

166: @*/
167: PetscErrorCode  PetscDrawSave(PetscDraw draw)
168: {
170:   PetscBool      isnull;

174:   PetscObjectTypeCompare((PetscObject)draw,PETSC_DRAW_NULL,&isnull);
175:   if (isnull) return(0);
176:   if (!draw->ops->save) return(0);
177:   (*draw->ops->save)(draw);
178:   return(0);
179: }