Actual source code: dtri.c
petsc-3.7.1 2016-05-15
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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: {

     32:   if (!draw->ops->triangle) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"This draw type %s does not support drawing triangles",((PetscObject)draw)->type_name);
     33:   (*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
     34:   return(0);
     35: }

     39: /*@
     40:    PetscDrawScalePopup - PetscDraws a contour scale window.

     42:    Collective on PetscDraw

     44:    Input Parameters:
     45: +  popup - the window (often a window obtained via PetscDrawGetPopup()
     46: .  min - minimum value being plotted
     47: -  max - maximum value being plotted

     49:    Level: intermediate

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

     53: @*/
     54: PetscErrorCode  PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max)
     55: {
     56:   PetscBool      isnull;
     57:   PetscReal      xl = 0.0,yl = 0.0,xr = 1.0,yr = 1.0;
     58:   PetscMPIInt    rank;
     60:   int            i;
     61:   char           string[32];

     64:   if (!popup) return(0);
     66:   PetscDrawIsNull(popup,&isnull);
     67:   if (isnull) return(0);
     68:   MPI_Comm_rank(PetscObjectComm((PetscObject)popup),&rank);

     70:   PetscDrawCheckResizedWindow(popup);
     71:   PetscDrawClear(popup);
     72:   PetscDrawSetTitle(popup,"Contour Scale");
     73:   PetscDrawSetCoordinates(popup,xl,yl,xr,yr);
     74:   PetscDrawCollectiveBegin(popup);
     75:   if (!rank) {
     76:     for (i=0; i<10; i++) {
     77:       int c = PetscDrawRealToColor((PetscReal)i/9,0,1);
     78:       PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);
     79:       yl += 0.1;
     80:     }
     81:     for (i=0; i<10; i++) {
     82:       PetscReal value = min + i*(max-min)/9;
     83:       /* look for a value that should be zero, but is not due to round-off */
     84:       if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0;
     85:       PetscSNPrintf(string,sizeof(string),"%18.16e",(double)value);
     86:       PetscDrawString(popup,0.2,0.02+i/10.0,PETSC_DRAW_BLACK,string);
     87:     }
     88:   }
     89:   PetscDrawCollectiveEnd(popup);
     90:   PetscDrawFlush(popup);
     91:   PetscDrawSave(popup);
     92:   return(0);
     93: }

     95: typedef struct {
     96:   int       m,n;
     97:   PetscReal *x,*y,min,max,*v;
     98:   PetscBool showgrid;
     99: } ZoomCtx;

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

    110:   PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->min,ctx->max,ctx->v);
    111:   if (ctx->showgrid) {
    112:     for (i=0; i<ctx->m; i++) {
    113:       PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);
    114:     }
    115:     for (i=0; i<ctx->n; i++) {
    116:       PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);
    117:     }
    118:   }
    119:   return(0);
    120: }

    124: /*@C
    125:    PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array
    126:    that is stored as a PETSc vector.

    128:    Collective on PetscDraw, but PetscDraw must be sequential

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

    137:    Options Database Keys:
    138: +  -draw_x_shared_colormap - Indicates use of private colormap
    139: -  -draw_contour_grid - PetscDraws grid contour

    141:    Level: intermediate

    143:    Concepts: contour plot
    144:    Concepts: drawing^contour plot

    146: .seealso: PetscDrawTensorContourPatch()

    148: @*/
    149: PetscErrorCode  PetscDrawTensorContour(PetscDraw draw,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v)
    150: {
    152:   int            N = m*n;
    153:   PetscBool      isnull;
    154:   PetscDraw      popup;
    155:   int            xin=1,yin=1,i;
    156:   PetscMPIInt    size;
    157:   PetscReal      h;
    158:   ZoomCtx        ctx;

    162:   PetscDrawIsNull(draw,&isnull);
    163:   if (isnull) return(0);
    164:   MPI_Comm_size(PetscObjectComm((PetscObject)draw),&size);
    165:   if (size > 1) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"May only be used with single processor PetscDraw");
    166:   if (N <= 0) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"n %d and m %d must be positive",m,n);

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

    178:   /* PetscDraw the scale window */
    179:   PetscDrawGetPopup(draw,&popup);
    180:   PetscDrawScalePopup(popup,ctx.min,ctx.max);

    182:   ctx.showgrid = PETSC_FALSE;
    183:   PetscOptionsGetBool(((PetscObject)draw)->options,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(draw,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: +  draw - the draw context
    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: .  min,max - the minimum and maximum 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 min,PetscReal max,PetscReal *v)
    239: {
    241:   int            c1,c2,c3,c4,i,j;
    242:   PetscReal      x1,x2,x3,x4,y_1,y2,y3,y4;

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

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