Actual source code: dtri.c

petsc-3.8.2 2017-11-09
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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:    Concepts: drawing^triangle
 20:    Concepts: graphics^triangle
 21:    Concepts: triangle

 23: .seealso: PetscDrawLine(), PetscDrawRectangle(), PetscDrawEllipse(), PetscDrawMarker(), PetscDrawPoint(), PetscDrawArrow()
 24: @*/
 25: PetscErrorCode  PetscDrawTriangle(PetscDraw draw,PetscReal x1,PetscReal y_1,PetscReal x2,PetscReal y2,PetscReal x3,PetscReal y3,int c1,int c2,int c3)
 26: {

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

 36: /*@
 37:    PetscDrawScalePopup - draws a contour scale window.

 39:    Collective on PetscDraw

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

 46:    Level: intermediate

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

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

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

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

 69:   PetscDrawCheckResizedWindow(popup);
 70:   PetscDrawClear(popup);
 71:   PetscDrawSetTitle(popup,"Contour Scale");
 72:   PetscDrawSetCoordinates(popup,xl,yl,xr,yr);
 73:   PetscDrawCollectiveBegin(popup);
 74:   if (!rank) {
 75:     for (i=0; i<10; i++) {
 76:       int c = PetscDrawRealToColor((PetscReal)i/9,0,1);
 77:       PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);
 78:       yl += 0.1;
 79:     }
 80:     for (i=0; i<10; i++) {
 81:       PetscReal value = min + i*(max-min)/9;
 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:       PetscSNPrintf(string,sizeof(string),"%18.16e",(double)value);
 85:       PetscDrawString(popup,0.2,0.02+i/10.0,PETSC_DRAW_BLACK,string);
 86:     }
 87:   }
 88:   PetscDrawCollectiveEnd(popup);
 89:   PetscDrawFlush(popup);
 90:   PetscDrawSave(popup);
 91:   return(0);
 92: }

 94: typedef struct {
 95:   int       m,n;
 96:   PetscReal *x,*y,min,max,*v;
 97:   PetscBool showgrid;
 98: } 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->min,ctx->max,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: }

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

123:    Collective on PetscDraw, but PetscDraw must be sequential

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

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

136:    Level: intermediate

138:    Concepts: contour plot
139:    Concepts: drawing^contour plot

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

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

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

163:   ctx.v   = v;
164:   ctx.m   = m;
165:   ctx.n   = n;
166:   ctx.max = ctx.min = v[0];
167:   for (i=0; i<N; i++) {
168:     if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i];
169:     if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i];
170:   }
171:   if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;}

173:   /* PetscDraw the scale window */
174:   PetscDrawGetPopup(draw,&popup);
175:   PetscDrawScalePopup(popup,ctx.min,ctx.max);

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

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

189:   if (!yi) {
190:     yin      = 0;
191:     PetscMalloc1(ctx.n,&ctx.y);
192:     h        = 1.0/(ctx.n-1);
193:     ctx.y[0] = 0.0;
194:     for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h;
195:   } else ctx.y = (PetscReal*)yi;

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

199:   if (!xin) {PetscFree(ctx.x);}
200:   if (!yin) {PetscFree(ctx.y);}
201:   return(0);
202: }

204: /*@
205:    PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot
206:    for a two-dimensional array.

208:    Not Collective

210:    Input Parameters:
211: +  draw - the draw context
212: .  m,n - the number of local mesh points in the x and y direction
213: .  x,y - the locations of the local mesh points
214: .  min,max - the minimum and maximum value in the entire contour
215: -  v - the data

217:    Options Database Keys:
218: .  -draw_x_shared_colormap - Activates private colormap

220:    Level: advanced

222:    Note:
223:    This is a lower level support routine, usually the user will call
224:    PetscDrawTensorContour().

226:    Concepts: contour plot

228: .seealso: PetscDrawTensorContour()

230: @*/
231: PetscErrorCode  PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal min,PetscReal max,PetscReal *v)
232: {
234:   int            c1,c2,c3,c4,i,j;
235:   PetscReal      x1,x2,x3,x4,y_1,y2,y3,y4;

239:   /* PetscDraw the contour plot patch */
240:   for (j=0; j<n-1; j++) {
241:     for (i=0; i<m-1; i++) {
242:       x1 = x[i];   y_1 = y[j];  c1 = PetscDrawRealToColor(v[i+j*m],min,max);
243:       x2 = x[i+1]; y2 = y_1;    c2 = PetscDrawRealToColor(v[i+j*m+1],min,max);
244:       x3 = x2;     y3 = y[j+1]; c3 = PetscDrawRealToColor(v[i+j*m+1+m],min,max);
245:       x4 = x1;     y4 = y3;     c4 = PetscDrawRealToColor(v[i+j*m+m],min,max);

247:       PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
248:       PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);
249:     }
250:   }
251:   return(0);
252: }