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 = PetscDrawIsNull(draw,&isnull);CHKERRQ(ierr); 34 if (isnull) PetscFunctionReturn(0); 35 if (!draw->ops->triangle) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"This draw type %s does not support drawing triangles",((PetscObject)draw)->type_name); 36 ierr = (*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 37 PetscFunctionReturn(0); 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 PetscBool isnull; 61 PetscReal xl = 0.0,yl = 0.0,xr = 1.0,yr = 1.0; 62 PetscMPIInt rank; 63 PetscErrorCode ierr; 64 int i; 65 char string[32]; 66 67 PetscFunctionBegin; 68 PetscValidHeaderSpecific(popup,PETSC_DRAW_CLASSID,1); 69 ierr = PetscDrawIsNull(popup,&isnull);CHKERRQ(ierr); 70 if (isnull) PetscFunctionReturn(0); 71 ierr = MPI_Comm_rank(PetscObjectComm((PetscObject)popup),&rank);CHKERRQ(ierr); 72 73 ierr = PetscDrawCheckResizedWindow(popup);CHKERRQ(ierr); 74 ierr = PetscDrawClear(popup);CHKERRQ(ierr); 75 ierr = PetscDrawSetTitle(popup,"Contour Scale");CHKERRQ(ierr); 76 ierr = PetscDrawSetCoordinates(popup,xl,yl,xr,yr);CHKERRQ(ierr); 77 ierr = PetscDrawCollectiveBegin(popup);CHKERRQ(ierr); 78 if (!rank) { 79 for (i=0; i<10; i++) { 80 int c = PetscDrawRealToColor((PetscReal)i/9,0,1); 81 ierr = PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);CHKERRQ(ierr); 82 yl += 0.1; 83 } 84 for (i=0; i<10; i++) { 85 PetscReal value = min + i*(max-min)/9; 86 /* look for a value that should be zero, but is not due to round-off */ 87 if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0; 88 ierr = PetscSNPrintf(string,sizeof(string),"%18.16e",(double)value);CHKERRQ(ierr); 89 ierr = PetscDrawString(popup,0.2,0.02+i/10.0,PETSC_DRAW_BLACK,string);CHKERRQ(ierr); 90 } 91 } 92 ierr = PetscDrawCollectiveEnd(popup);CHKERRQ(ierr); 93 ierr = PetscDrawFlush(popup);CHKERRQ(ierr); 94 PetscFunctionReturn(0); 95 } 96 97 typedef struct { 98 int m,n; 99 PetscReal *x,*y,min,max,*v; 100 PetscBool showgrid; 101 } ZoomCtx; 102 103 #undef __FUNCT__ 104 #define __FUNCT__ "PetscDrawTensorContour_Zoom" 105 static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx) 106 { 107 PetscErrorCode ierr; 108 int i; 109 ZoomCtx *ctx = (ZoomCtx*)dctx; 110 111 PetscFunctionBegin; 112 ierr = PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->min,ctx->max,ctx->v);CHKERRQ(ierr); 113 if (ctx->showgrid) { 114 for (i=0; i<ctx->m; i++) { 115 ierr = PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);CHKERRQ(ierr); 116 } 117 for (i=0; i<ctx->n; i++) { 118 ierr = PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);CHKERRQ(ierr); 119 } 120 } 121 PetscFunctionReturn(0); 122 } 123 124 #undef __FUNCT__ 125 #define __FUNCT__ "PetscDrawTensorContour" 126 /*@C 127 PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array 128 that is stored as a PETSc vector. 129 130 Collective on PetscDraw, but PetscDraw must be sequential 131 132 Input Parameters: 133 + draw - the draw context 134 . m,n - the global number of mesh points in the x and y directions 135 . xi,yi - the locations of the global mesh points (optional, use NULL 136 to indicate uniform spacing on [0,1]) 137 - V - the values 138 139 Options Database Keys: 140 + -draw_x_shared_colormap - Indicates use of private colormap 141 - -draw_contour_grid - PetscDraws grid contour 142 143 Level: intermediate 144 145 Concepts: contour plot 146 Concepts: drawing^contour plot 147 148 .seealso: PetscDrawTensorContourPatch() 149 150 @*/ 151 PetscErrorCode PetscDrawTensorContour(PetscDraw draw,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v) 152 { 153 PetscErrorCode ierr; 154 int N = m*n; 155 PetscBool isnull; 156 PetscDraw popup; 157 int xin=1,yin=1,i; 158 PetscMPIInt size; 159 PetscReal h; 160 ZoomCtx ctx; 161 162 PetscFunctionBegin; 163 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 164 ierr = PetscDrawIsNull(draw,&isnull);CHKERRQ(ierr); 165 if (isnull) PetscFunctionReturn(0); 166 ierr = MPI_Comm_size(PetscObjectComm((PetscObject)draw),&size);CHKERRQ(ierr); 167 if (size > 1) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"May only be used with single processor PetscDraw"); 168 if (N <= 0) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"n %d and m %d must be positive",m,n); 169 170 ctx.v = v; 171 ctx.m = m; 172 ctx.n = n; 173 ctx.max = ctx.min = v[0]; 174 for (i=0; i<N; i++) { 175 if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i]; 176 if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i]; 177 } 178 if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;} 179 180 /* PetscDraw the scale window */ 181 ierr = PetscDrawGetPopup(draw,&popup);CHKERRQ(ierr); 182 if (popup) {ierr = PetscDrawScalePopup(popup,ctx.min,ctx.max);CHKERRQ(ierr);} 183 184 ctx.showgrid = PETSC_FALSE; 185 ierr = PetscOptionsGetBool(((PetscObject)draw)->options,NULL,"-draw_contour_grid",&ctx.showgrid,NULL);CHKERRQ(ierr); 186 187 /* fill up x and y coordinates */ 188 if (!xi) { 189 xin = 0; 190 ierr = PetscMalloc1(ctx.m,&ctx.x);CHKERRQ(ierr); 191 h = 1.0/(ctx.m-1); 192 ctx.x[0] = 0.0; 193 for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h; 194 } else ctx.x = (PetscReal*)xi; 195 196 if (!yi) { 197 yin = 0; 198 ierr = PetscMalloc1(ctx.n,&ctx.y);CHKERRQ(ierr); 199 h = 1.0/(ctx.n-1); 200 ctx.y[0] = 0.0; 201 for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h; 202 } else ctx.y = (PetscReal*)yi; 203 204 ierr = PetscDrawZoom(draw,PetscDrawTensorContour_Zoom,&ctx);CHKERRQ(ierr); 205 206 if (!xin) {ierr = PetscFree(ctx.x);CHKERRQ(ierr);} 207 if (!yin) {ierr = PetscFree(ctx.y);CHKERRQ(ierr);} 208 PetscFunctionReturn(0); 209 } 210 211 #undef __FUNCT__ 212 #define __FUNCT__ "PetscDrawTensorContourPatch" 213 /*@ 214 PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot 215 for a two-dimensional array. 216 217 Not Collective 218 219 Input Parameters: 220 + draw - the draw context 221 . m,n - the number of local mesh points in the x and y direction 222 . x,y - the locations of the local mesh points 223 . min,max - the minimum and maximum value in the entire contour 224 - v - the data 225 226 Options Database Keys: 227 . -draw_x_shared_colormap - Activates private colormap 228 229 Level: advanced 230 231 Note: 232 This is a lower level support routine, usually the user will call 233 PetscDrawTensorContour(). 234 235 Concepts: contour plot 236 237 .seealso: PetscDrawTensorContour() 238 239 @*/ 240 PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal min,PetscReal max,PetscReal *v) 241 { 242 PetscErrorCode ierr; 243 int c1,c2,c3,c4,i,j; 244 PetscReal x1,x2,x3,x4,y_1,y2,y3,y4; 245 246 PetscFunctionBegin; 247 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 248 /* PetscDraw the contour plot patch */ 249 for (j=0; j<n-1; j++) { 250 for (i=0; i<m-1; i++) { 251 x1 = x[i]; y_1 = y[j]; c1 = PetscDrawRealToColor(v[i+j*m],min,max); 252 x2 = x[i+1]; y2 = y_1; c2 = PetscDrawRealToColor(v[i+j*m+1],min,max); 253 x3 = x2; y3 = y[j+1]; c3 = PetscDrawRealToColor(v[i+j*m+1+m],min,max); 254 x4 = x1; y4 = y3; c4 = PetscDrawRealToColor(v[i+j*m+m],min,max); 255 256 ierr = PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 257 ierr = PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);CHKERRQ(ierr); 258 } 259 } 260 PetscFunctionReturn(0); 261 } 262