1 2 /* 3 Provides the calling sequences for all the basic PetscDraw routines. 4 */ 5 #include <petsc-private/drawimpl.h> /*I "petscdraw.h" I*/ 6 7 #undef __FUNCT__ 8 #define __FUNCT__ "PetscDrawTriangle" 9 /*@ 10 PetscDrawTriangle - PetscDraws a triangle onto a drawable. 11 12 Not Collective 13 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 18 19 Level: beginner 20 21 Concepts: drawing^triangle 22 Concepts: graphics^triangle 23 Concepts: triangle 24 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 { 28 PetscErrorCode ierr; 29 PetscBool isnull; 30 31 PetscFunctionBegin; 32 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 33 ierr = PetscObjectTypeCompare((PetscObject)draw,PETSC_DRAW_NULL,&isnull);CHKERRQ(ierr); 34 if (isnull) PetscFunctionReturn(0); 35 ierr = (*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 36 PetscFunctionReturn(0); 37 } 38 39 40 #undef __FUNCT__ 41 #define __FUNCT__ "PetscDrawScalePopup" 42 /*@ 43 PetscDrawScalePopup - PetscDraws a contour scale window. 44 45 Collective on PetscDraw 46 47 Input Parameters: 48 + popup - the window (often a window obtained via PetscDrawGetPopup() 49 . min - minimum value being plotted 50 - max - maximum value being plotted 51 52 Level: intermediate 53 54 Notes: 55 All processors that share the draw MUST call this routine 56 57 @*/ 58 PetscErrorCode PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max) 59 { 60 PetscReal xl = 0.0,yl = 0.0,xr = 2.0,yr = 1.0,value; 61 PetscErrorCode ierr; 62 int i,c = PETSC_DRAW_BASIC_COLORS,rank; 63 char string[32]; 64 MPI_Comm comm; 65 66 PetscFunctionBegin; 67 ierr = PetscDrawCheckResizedWindow(popup);CHKERRQ(ierr); 68 ierr = PetscObjectGetComm((PetscObject)popup,&comm);CHKERRQ(ierr); 69 ierr = MPI_Comm_rank(comm,&rank);CHKERRQ(ierr); 70 if (rank) PetscFunctionReturn(0); 71 72 for (i=0; i<10; i++) { 73 ierr = PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);CHKERRQ(ierr); 74 75 yl += .1; yr += .1; 76 c = (int)((double)c + (245. - PETSC_DRAW_BASIC_COLORS)/9.); 77 } 78 for (i=0; i<10; i++) { 79 value = min + i*(max-min)/9.0; 80 /* look for a value that should be zero, but is not due to round-off */ 81 if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0; 82 sprintf(string,"%18.16e",(double)value); 83 ierr = PetscDrawString(popup,.2,.02 + i/10.0,PETSC_DRAW_BLACK,string);CHKERRQ(ierr); 84 } 85 ierr = PetscDrawSetTitle(popup,"Contour Scale");CHKERRQ(ierr); 86 ierr = PetscDrawFlush(popup);CHKERRQ(ierr); 87 PetscFunctionReturn(0); 88 } 89 90 typedef struct { 91 int m,n; 92 PetscReal *x,*y,min,max,*v; 93 PetscBool showgrid; 94 } ZoomCtx; 95 96 #undef __FUNCT__ 97 #define __FUNCT__ "PetscDrawTensorContour_Zoom" 98 static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx) 99 { 100 PetscErrorCode ierr; 101 int i; 102 ZoomCtx *ctx = (ZoomCtx*)dctx; 103 104 PetscFunctionBegin; 105 ierr = PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->max,ctx->min,ctx->v);CHKERRQ(ierr); 106 if (ctx->showgrid) { 107 for (i=0; i<ctx->m; i++) { 108 ierr = PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);CHKERRQ(ierr); 109 } 110 for (i=0; i<ctx->n; i++) { 111 ierr = PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);CHKERRQ(ierr); 112 } 113 } 114 PetscFunctionReturn(0); 115 } 116 117 #undef __FUNCT__ 118 #define __FUNCT__ "PetscDrawTensorContour" 119 /*@C 120 PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array 121 that is stored as a PETSc vector. 122 123 Collective on PetscDraw, but PetscDraw must be sequential 124 125 Input Parameters: 126 + win - the window to draw in 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 131 132 Options Database Keys: 133 + -draw_x_shared_colormap - Indicates use of private colormap 134 - -draw_contour_grid - PetscDraws grid contour 135 136 Level: intermediate 137 138 Concepts: contour plot 139 Concepts: drawing^contour plot 140 141 .seealso: PetscDrawTensorContourPatch() 142 143 @*/ 144 PetscErrorCode PetscDrawTensorContour(PetscDraw win,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v) 145 { 146 PetscErrorCode ierr; 147 int N = m*n; 148 PetscBool isnull; 149 PetscDraw popup; 150 MPI_Comm comm; 151 int xin=1,yin=1,i; 152 PetscMPIInt size; 153 PetscReal h; 154 ZoomCtx ctx; 155 156 PetscFunctionBegin; 157 ierr = PetscDrawIsNull(win,&isnull);CHKERRQ(ierr); if (isnull) PetscFunctionReturn(0); 158 ierr = PetscObjectGetComm((PetscObject)win,&comm);CHKERRQ(ierr); 159 ierr = MPI_Comm_size(comm,&size);CHKERRQ(ierr); 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); 162 163 /* create scale window */ 164 ierr = PetscDrawGetPopup(win,&popup);CHKERRQ(ierr); 165 ierr = PetscDrawCheckResizedWindow(win);CHKERRQ(ierr); 166 167 ctx.v = v; 168 ctx.m = m; 169 ctx.n = n; 170 ctx.max = ctx.min = v[0]; 171 for (i=0; i<N; i++) { 172 if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i]; 173 if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i]; 174 } 175 if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;} 176 177 /* PetscDraw the scale window */ 178 if (popup) {ierr = PetscDrawScalePopup(popup,ctx.min,ctx.max);CHKERRQ(ierr);} 179 180 ctx.showgrid = PETSC_FALSE; 181 ierr = PetscOptionsGetBool(NULL,"-draw_contour_grid",&ctx.showgrid,NULL);CHKERRQ(ierr); 182 183 /* fill up x and y coordinates */ 184 if (!xi) { 185 xin = 0; 186 ierr = PetscMalloc(ctx.m*sizeof(PetscReal),&ctx.x);CHKERRQ(ierr); 187 h = 1.0/(ctx.m-1); 188 ctx.x[0] = 0.0; 189 for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h; 190 } else ctx.x = (PetscReal*)xi; 191 192 if (!yi) { 193 yin = 0; 194 ierr = PetscMalloc(ctx.n*sizeof(PetscReal),&ctx.y);CHKERRQ(ierr); 195 h = 1.0/(ctx.n-1); 196 ctx.y[0] = 0.0; 197 for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h; 198 } else ctx.y = (PetscReal*)yi; 199 200 ierr = PetscDrawZoom(win,(PetscErrorCode (*)(PetscDraw,void*))PetscDrawTensorContour_Zoom,&ctx);CHKERRQ(ierr); 201 202 if (!xin) {ierr = PetscFree(ctx.x);CHKERRQ(ierr);} 203 if (!yin) {ierr = PetscFree(ctx.y);CHKERRQ(ierr);} 204 PetscFunctionReturn(0); 205 } 206 207 #undef __FUNCT__ 208 #define __FUNCT__ "PetscDrawTensorContourPatch" 209 /*@ 210 PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot 211 for a two-dimensional array. 212 213 Not Collective 214 215 Input Parameters: 216 + win - the window to draw in 217 . m,n - the number of local mesh points in the x and y direction 218 . x,y - the locations of the local mesh points 219 . max,min - the maximum and minimum value in the entire contour 220 - v - the data 221 222 Options Database Keys: 223 . -draw_x_shared_colormap - Activates private colormap 224 225 Level: advanced 226 227 Note: 228 This is a lower level support routine, usually the user will call 229 PetscDrawTensorContour(). 230 231 Concepts: contour plot 232 233 .seealso: PetscDrawTensorContour() 234 235 @*/ 236 PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal max,PetscReal min,PetscReal *v) 237 { 238 PetscErrorCode ierr; 239 int c1,c2,c3,c4,i,j; 240 PetscReal x1,x2,x3,x4,y_1,y2,y3,y4,scale; 241 242 PetscFunctionBegin; 243 scale = (245.0 - PETSC_DRAW_BASIC_COLORS)/(max - min); 244 245 /* PetscDraw the contour plot patch */ 246 for (j=0; j<n-1; j++) { 247 for (i=0; i<m-1; i++) { 248 x1 = x[i]; y_1 = y[j]; c1 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m] - min)); 249 x2 = x[i+1];y2 = y_1; c2 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1]-min)); 250 x3 = x2; y3 = y[j+1];c3 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1+m]-min)); 251 x4 = x1; y4 = y3; c4 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+m]-min)); 252 253 ierr = PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 254 ierr = PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);CHKERRQ(ierr); 255 } 256 } 257 PetscFunctionReturn(0); 258 } 259