Actual source code: dtri.c

petsc-3.7.3 2016-07-24
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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: }