Actual source code: dtri.c

petsc-master 2019-09-23
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  2: /*
  3:        Provides the calling sequences for all the basic PetscDraw routines.
  4: */
  5:  #include <petsc/private/drawimpl.h>

  7: /*@
  8:    PetscDrawTriangle - PetscDraws a triangle  onto a drawable.

 10:    Not Collective

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

 17:    Level: beginner

 19: .seealso: PetscDrawLine(), PetscDrawRectangle(), PetscDrawEllipse(), PetscDrawMarker(), PetscDrawPoint(), PetscDrawArrow()
 20: @*/
 21: PetscErrorCode  PetscDrawTriangle(PetscDraw draw,PetscReal x1,PetscReal y_1,PetscReal x2,PetscReal y2,PetscReal x3,PetscReal y3,int c1,int c2,int c3)
 22: {

 27:   if (!draw->ops->triangle) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"This draw type %s does not support drawing triangles",((PetscObject)draw)->type_name);
 28:   (*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
 29:   return(0);
 30: }

 32: /*@
 33:    PetscDrawScalePopup - draws a contour scale window.

 35:    Collective on PetscDraw

 37:    Input Parameters:
 38: +  popup - the window (often a window obtained via PetscDrawGetPopup()
 39: .  min - minimum value being plotted
 40: -  max - maximum value being plotted

 42:    Level: intermediate

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

 47: .seealso: PetscDrawGetPopup(), PetscDrawTensorContour()

 49: @*/
 50: PetscErrorCode  PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max)
 51: {
 52:   PetscBool      isnull;
 53:   PetscReal      xl = 0.0,yl = 0.0,xr = 1.0,yr = 1.0;
 54:   PetscMPIInt    rank;
 56:   int            i;
 57:   char           string[32];

 60:   if (!popup) return(0);
 62:   PetscDrawIsNull(popup,&isnull);
 63:   if (isnull) return(0);
 64:   MPI_Comm_rank(PetscObjectComm((PetscObject)popup),&rank);

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

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

 97: static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx)
 98: {
100:   int            i;
101:   ZoomCtx        *ctx = (ZoomCtx*)dctx;

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

116: /*@C
117:    PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array
118:    that is stored as a PETSc vector.

120:    Collective on PetscDraw, but PetscDraw must be sequential

122:    Input Parameters:
123: +   draw  - the draw context
124: .   m,n   - the global number of mesh points in the x and y directions
125: .   xi,yi - the locations of the global mesh points (optional, use NULL
126:             to indicate uniform spacing on [0,1])
127: -   V     - the values

129:    Options Database Keys:
130: +  -draw_x_shared_colormap - Indicates use of private colormap
131: -  -draw_contour_grid - PetscDraws grid contour

133:    Level: intermediate


136: .seealso: PetscDrawTensorContourPatch(), PetscDrawScalePopup()

138: @*/
139: PetscErrorCode  PetscDrawTensorContour(PetscDraw draw,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v)
140: {
142:   int            N = m*n;
143:   PetscBool      isnull;
144:   PetscDraw      popup;
145:   int            xin=1,yin=1,i;
146:   PetscMPIInt    size;
147:   PetscReal      h;
148:   ZoomCtx        ctx;

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

158:   ctx.v   = v;
159:   ctx.m   = m;
160:   ctx.n   = n;
161:   ctx.max = ctx.min = v[0];
162:   for (i=0; i<N; i++) {
163:     if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i];
164:     if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i];
165:   }
166:   if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;}

168:   /* PetscDraw the scale window */
169:   PetscDrawGetPopup(draw,&popup);
170:   PetscDrawScalePopup(popup,ctx.min,ctx.max);

172:   ctx.showgrid = PETSC_FALSE;
173:   PetscOptionsGetBool(((PetscObject)draw)->options,NULL,"-draw_contour_grid",&ctx.showgrid,NULL);

175:   /* fill up x and y coordinates */
176:   if (!xi) {
177:     xin      = 0;
178:     PetscMalloc1(ctx.m,&ctx.x);
179:     h        = 1.0/(ctx.m-1);
180:     ctx.x[0] = 0.0;
181:     for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h;
182:   } else ctx.x = (PetscReal*)xi;

184:   if (!yi) {
185:     yin      = 0;
186:     PetscMalloc1(ctx.n,&ctx.y);
187:     h        = 1.0/(ctx.n-1);
188:     ctx.y[0] = 0.0;
189:     for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h;
190:   } else ctx.y = (PetscReal*)yi;

192:   PetscDrawZoom(draw,PetscDrawTensorContour_Zoom,&ctx);

194:   if (!xin) {PetscFree(ctx.x);}
195:   if (!yin) {PetscFree(ctx.y);}
196:   return(0);
197: }

199: /*@
200:    PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot
201:    for a two-dimensional array.

203:    Not Collective

205:    Input Parameters:
206: +  draw - the draw context
207: .  m,n - the number of local mesh points in the x and y direction
208: .  x,y - the locations of the local mesh points
209: .  min,max - the minimum and maximum value in the entire contour
210: -  v - the data

212:    Options Database Keys:
213: .  -draw_x_shared_colormap - Activates private colormap

215:    Level: advanced

217:    Note:
218:    This is a lower level support routine, usually the user will call
219:    PetscDrawTensorContour().

221: .seealso: PetscDrawTensorContour()

223: @*/
224: PetscErrorCode  PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal min,PetscReal max,PetscReal *v)
225: {
227:   int            c1,c2,c3,c4,i,j;
228:   PetscReal      x1,x2,x3,x4,y_1,y2,y3,y4;

232:   /* PetscDraw the contour plot patch */
233:   for (j=0; j<n-1; j++) {
234:     for (i=0; i<m-1; i++) {
235:       x1 = x[i];   y_1 = y[j];  c1 = PetscDrawRealToColor(v[i+j*m],min,max);
236:       x2 = x[i+1]; y2 = y_1;    c2 = PetscDrawRealToColor(v[i+j*m+1],min,max);
237:       x3 = x2;     y3 = y[j+1]; c3 = PetscDrawRealToColor(v[i+j*m+1+m],min,max);
238:       x4 = x1;     y4 = y3;     c4 = PetscDrawRealToColor(v[i+j*m+m],min,max);

240:       PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
241:       PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);
242:     }
243:   }
244:   return(0);
245: }