Date: 2015-10-02T21:58:48+00:00

Actual source code: dtri.c
petsc-3.6.2 2015-10-02
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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*/

      9: /*@
     10:    PetscDrawTriangle - PetscDraws a triangle  onto a drawable.

     12:    Not Collective

     14:    Input Parameters:
     15: +  draw - the drawing context
     16: .  x1,y1,x2,y2,x3,y3 - the coordinates of the vertices
     17: -  c1,c2,c3 - the colors of the three vertices in the same order as the xi,yi

     19:    Level: beginner

     21:    Concepts: drawing^triangle
     22:    Concepts: graphics^triangle
     23:    Concepts: triangle

     25: @*/
     26: PetscErrorCode  PetscDrawTriangle(PetscDraw draw,PetscReal x1,PetscReal y_1,PetscReal x2,PetscReal y2,PetscReal x3,PetscReal y3,int c1,int c2,int c3)
     27: {
     29:   PetscBool      isnull;

     33:   PetscObjectTypeCompare((PetscObject)draw,PETSC_DRAW_NULL,&isnull);
     34:   if (isnull) return(0);
     35:   if (!draw->ops->triangle) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"No triangles with this PetscDrawType");
     36:   (*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
     37:   return(0);
     38: }

     43: /*@
     44:        PetscDrawScalePopup - PetscDraws a contour scale window.

     46:      Collective on PetscDraw

     48:   Input Parameters:
     49: +    popup - the window (often a window obtained via PetscDrawGetPopup()
     50: .    min - minimum value being plotted
     51: -    max - maximum value being plotted

     53:   Level: intermediate

     55:   Notes:
     56:      All processors that share the draw MUST call this routine

     58: @*/
     59: PetscErrorCode  PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max)
     60: {
     61:   PetscReal      xl = 0.0,yl = 0.0,xr = 2.0,yr = 1.0,value;
     63:   int            i,c = PETSC_DRAW_BASIC_COLORS,rank;
     64:   char           string[32];
     65:   MPI_Comm       comm;

     68:   PetscDrawCheckResizedWindow(popup);
     69:   PetscDrawSynchronizedClear(popup);
     70:   PetscObjectGetComm((PetscObject)popup,&comm);
     71:   MPI_Comm_rank(comm,&rank);
     72:   if (rank) return(0);

     74:   for (i=0; i<10; i++) {
     75:     PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);

     77:     yl += .1; yr += .1;
     78:     c = (int)((double)c + (245. - PETSC_DRAW_BASIC_COLORS)/9.);
     79:   }
     80:   for (i=0; i<10; i++) {
     81:     value = min + i*(max-min)/9.0;
     82:     /* look for a value that should be zero, but is not due to round-off */
     83:     if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0;
     84:     sprintf(string,"%18.16e",(double)value);
     85:     PetscDrawString(popup,.2,.02 + i/10.0,PETSC_DRAW_BLACK,string);
     86:   }
     87:   PetscDrawSetTitle(popup,"Contour Scale");
     88:   PetscDrawFlush(popup);
     89:   return(0);
     90: }

     92: typedef struct {
     93:   int       m,n;
     94:   PetscReal *x,*y,min,max,*v;
     95:   PetscBool showgrid;
     96: } ZoomCtx;

    100: static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx)
    101: {
    103:   int            i;
    104:   ZoomCtx        *ctx = (ZoomCtx*)dctx;

    107:   PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->max,ctx->min,ctx->v);
    108:   if (ctx->showgrid) {
    109:     for (i=0; i<ctx->m; i++) {
    110:       PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);
    111:     }
    112:     for (i=0; i<ctx->n; i++) {
    113:       PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);
    114:     }
    115:   }
    116:   return(0);
    117: }

    121: /*@C
    122:    PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array
    123:    that is stored as a PETSc vector.

    125:    Collective on PetscDraw, but PetscDraw must be sequential

    127:    Input Parameters:
    128: +   win   - the window to draw in
    129: .   m,n   - the global number of mesh points in the x and y directions
    130: .   xi,yi - the locations of the global mesh points (optional, use NULL
    131:             to indicate uniform spacing on [0,1])
    132: -   V     - the values

    134:    Options Database Keys:
    135: +  -draw_x_shared_colormap - Indicates use of private colormap
    136: -  -draw_contour_grid - PetscDraws grid contour

    138:    Level: intermediate

    140:    Concepts: contour plot
    141:    Concepts: drawing^contour plot

    143: .seealso: PetscDrawTensorContourPatch()

    145: @*/
    146: PetscErrorCode  PetscDrawTensorContour(PetscDraw win,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v)
    147: {
    149:   int            N = m*n;
    150:   PetscBool      isnull;
    151:   PetscDraw      popup;
    152:   MPI_Comm       comm;
    153:   int            xin=1,yin=1,i;
    154:   PetscMPIInt    size;
    155:   PetscReal      h;
    156:   ZoomCtx        ctx;

    159:   PetscDrawIsNull(win,&isnull); if (isnull) return(0);
    160:   PetscObjectGetComm((PetscObject)win,&comm);
    161:   MPI_Comm_size(comm,&size);
    162:   if (size > 1) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"May only be used with single processor PetscDraw");
    163:   if (N <= 0) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"n %d and m %d must be positive",m,n);

    165:   /* create scale window */
    166:   PetscDrawGetPopup(win,&popup);
    167:   PetscDrawCheckResizedWindow(win);

    169:   ctx.v   = v;
    170:   ctx.m   = m;
    171:   ctx.n   = n;
    172:   ctx.max = ctx.min = v[0];
    173:   for (i=0; i<N; i++) {
    174:     if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i];
    175:     if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i];
    176:   }
    177:   if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;}

    179:   /* PetscDraw the scale window */
    180:   if (popup) {PetscDrawScalePopup(popup,ctx.min,ctx.max);}

    182:   ctx.showgrid = PETSC_FALSE;
    183:   PetscOptionsGetBool(NULL,"-draw_contour_grid",&ctx.showgrid,NULL);

    185:   /* fill up x and y coordinates */
    186:   if (!xi) {
    187:     xin      = 0;
    188:     PetscMalloc1(ctx.m,&ctx.x);
    189:     h        = 1.0/(ctx.m-1);
    190:     ctx.x[0] = 0.0;
    191:     for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h;
    192:   } else ctx.x = (PetscReal*)xi;

    194:   if (!yi) {
    195:     yin      = 0;
    196:     PetscMalloc1(ctx.n,&ctx.y);
    197:     h        = 1.0/(ctx.n-1);
    198:     ctx.y[0] = 0.0;
    199:     for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h;
    200:   } else ctx.y = (PetscReal*)yi;

    202:   PetscDrawZoom(win,(PetscErrorCode (*)(PetscDraw,void*))PetscDrawTensorContour_Zoom,&ctx);

    204:   if (!xin) {PetscFree(ctx.x);}
    205:   if (!yin) {PetscFree(ctx.y);}
    206:   return(0);
    207: }

    211: /*@
    212:    PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot
    213:    for a two-dimensional array.

    215:    Not Collective

    217:    Input Parameters:
    218: +  win - the window to draw in
    219: .  m,n - the number of local mesh points in the x and y direction
    220: .  x,y - the locations of the local mesh points
    221: .  max,min - the maximum and minimum value in the entire contour
    222: -  v - the data

    224:    Options Database Keys:
    225: .  -draw_x_shared_colormap - Activates private colormap

    227:    Level: advanced

    229:    Note:
    230:    This is a lower level support routine, usually the user will call
    231:    PetscDrawTensorContour().

    233:    Concepts: contour plot

    235: .seealso: PetscDrawTensorContour()

    237: @*/
    238: PetscErrorCode  PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal max,PetscReal min,PetscReal *v)
    239: {
    241:   int            c1,c2,c3,c4,i,j;
    242:   PetscReal      x1,x2,x3,x4,y_1,y2,y3,y4,scale;

    245:   scale = (245.0 - PETSC_DRAW_BASIC_COLORS)/(max - min);

    247:   /* PetscDraw the contour plot patch */
    248:   for (j=0; j<n-1; j++) {
    249:     for (i=0; i<m-1; i++) {
    250:       x1 = x[i];  y_1 = y[j]; c1 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m] - min));
    251:       x2 = x[i+1];y2 = y_1;   c2 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1]-min));
    252:       x3 = x2;    y3 = y[j+1];c3 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1+m]-min));
    253:       x4 = x1;    y4 = y3;    c4 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+m]-min));

    255:       PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
    256:       PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);
    257:     }
    258:   }
    259:   return(0);
    260: }