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 PetscReal xl = 0.0,yl = 0.0,xr = 2.0,yr = 1.0,value; 61 PetscMPIInt rank; 62 PetscErrorCode ierr; 63 int i; 64 char string[32]; 65 66 PetscFunctionBegin; 67 ierr = PetscDrawCheckResizedWindow(popup);CHKERRQ(ierr); 68 ierr = PetscDrawSynchronizedClear(popup);CHKERRQ(ierr); 69 ierr = PetscDrawCollectiveBegin(popup);CHKERRQ(ierr); 70 ierr = MPI_Comm_rank(PetscObjectComm((PetscObject)popup),&rank);CHKERRQ(ierr); 71 if (!rank) { 72 ierr = PetscDrawSetTitle(popup,"Contour Scale");CHKERRQ(ierr); 73 for (i=0; i<10; i++) { 74 int c = PetscDrawRealToColor((PetscReal)i/9,0,1); 75 ierr = PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);CHKERRQ(ierr); 76 yl += 0.1; yr += 0.1; 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 ierr = PetscSNPrintf(string,sizeof(string),"%18.16e",(double)value);CHKERRQ(ierr); 83 ierr = PetscDrawString(popup,0.2,0.02 + i/10.0,PETSC_DRAW_BLACK,string);CHKERRQ(ierr); 84 } 85 ierr = PetscDrawFlush(popup);CHKERRQ(ierr); 86 } 87 ierr = PetscDrawCollectiveEnd(popup);CHKERRQ(ierr); 88 PetscFunctionReturn(0); 89 } 90 91 typedef struct { 92 int m,n; 93 PetscReal *x,*y,min,max,*v; 94 PetscBool showgrid; 95 } ZoomCtx; 96 97 #undef __FUNCT__ 98 #define __FUNCT__ "PetscDrawTensorContour_Zoom" 99 static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx) 100 { 101 PetscErrorCode ierr; 102 int i; 103 ZoomCtx *ctx = (ZoomCtx*)dctx; 104 105 PetscFunctionBegin; 106 ierr = PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->min,ctx->max,ctx->v);CHKERRQ(ierr); 107 if (ctx->showgrid) { 108 for (i=0; i<ctx->m; i++) { 109 ierr = PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);CHKERRQ(ierr); 110 } 111 for (i=0; i<ctx->n; i++) { 112 ierr = PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);CHKERRQ(ierr); 113 } 114 } 115 PetscFunctionReturn(0); 116 } 117 118 #undef __FUNCT__ 119 #define __FUNCT__ "PetscDrawTensorContour" 120 /*@C 121 PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array 122 that is stored as a PETSc vector. 123 124 Collective on PetscDraw, but PetscDraw must be sequential 125 126 Input Parameters: 127 + draw - the draw context 128 . m,n - the global number of mesh points in the x and y directions 129 . xi,yi - the locations of the global mesh points (optional, use NULL 130 to indicate uniform spacing on [0,1]) 131 - V - the values 132 133 Options Database Keys: 134 + -draw_x_shared_colormap - Indicates use of private colormap 135 - -draw_contour_grid - PetscDraws grid contour 136 137 Level: intermediate 138 139 Concepts: contour plot 140 Concepts: drawing^contour plot 141 142 .seealso: PetscDrawTensorContourPatch() 143 144 @*/ 145 PetscErrorCode PetscDrawTensorContour(PetscDraw draw,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v) 146 { 147 PetscErrorCode ierr; 148 int N = m*n; 149 PetscBool isnull; 150 PetscDraw popup; 151 int xin=1,yin=1,i; 152 PetscMPIInt size; 153 PetscReal h; 154 ZoomCtx ctx; 155 156 PetscFunctionBegin; 157 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 158 ierr = PetscDrawIsNull(draw,&isnull);CHKERRQ(ierr); 159 if (isnull) PetscFunctionReturn(0); 160 ierr = MPI_Comm_size(PetscObjectComm((PetscObject)draw),&size);CHKERRQ(ierr); 161 if (size > 1) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"May only be used with single processor PetscDraw"); 162 if (N <= 0) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"n %d and m %d must be positive",m,n); 163 164 ctx.v = v; 165 ctx.m = m; 166 ctx.n = n; 167 ctx.max = ctx.min = v[0]; 168 for (i=0; i<N; i++) { 169 if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i]; 170 if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i]; 171 } 172 if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;} 173 174 /* PetscDraw the scale window */ 175 ierr = PetscDrawGetPopup(draw,&popup);CHKERRQ(ierr); 176 if (popup) {ierr = PetscDrawScalePopup(popup,ctx.min,ctx.max);CHKERRQ(ierr);} 177 178 ctx.showgrid = PETSC_FALSE; 179 ierr = PetscOptionsGetBool(((PetscObject)draw)->options,NULL,"-draw_contour_grid",&ctx.showgrid,NULL);CHKERRQ(ierr); 180 181 /* fill up x and y coordinates */ 182 if (!xi) { 183 xin = 0; 184 ierr = PetscMalloc1(ctx.m,&ctx.x);CHKERRQ(ierr); 185 h = 1.0/(ctx.m-1); 186 ctx.x[0] = 0.0; 187 for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h; 188 } else ctx.x = (PetscReal*)xi; 189 190 if (!yi) { 191 yin = 0; 192 ierr = PetscMalloc1(ctx.n,&ctx.y);CHKERRQ(ierr); 193 h = 1.0/(ctx.n-1); 194 ctx.y[0] = 0.0; 195 for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h; 196 } else ctx.y = (PetscReal*)yi; 197 198 ierr = PetscDrawZoom(draw,PetscDrawTensorContour_Zoom,&ctx);CHKERRQ(ierr); 199 200 if (!xin) {ierr = PetscFree(ctx.x);CHKERRQ(ierr);} 201 if (!yin) {ierr = PetscFree(ctx.y);CHKERRQ(ierr);} 202 PetscFunctionReturn(0); 203 } 204 205 #undef __FUNCT__ 206 #define __FUNCT__ "PetscDrawTensorContourPatch" 207 /*@ 208 PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot 209 for a two-dimensional array. 210 211 Not Collective 212 213 Input Parameters: 214 + draw - the draw context 215 . m,n - the number of local mesh points in the x and y direction 216 . x,y - the locations of the local mesh points 217 . min,max - the minimum and maximum value in the entire contour 218 - v - the data 219 220 Options Database Keys: 221 . -draw_x_shared_colormap - Activates private colormap 222 223 Level: advanced 224 225 Note: 226 This is a lower level support routine, usually the user will call 227 PetscDrawTensorContour(). 228 229 Concepts: contour plot 230 231 .seealso: PetscDrawTensorContour() 232 233 @*/ 234 PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal min,PetscReal max,PetscReal *v) 235 { 236 PetscErrorCode ierr; 237 int c1,c2,c3,c4,i,j; 238 PetscReal x1,x2,x3,x4,y_1,y2,y3,y4; 239 240 PetscFunctionBegin; 241 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 242 /* PetscDraw the contour plot patch */ 243 for (j=0; j<n-1; j++) { 244 for (i=0; i<m-1; i++) { 245 x1 = x[i]; y_1 = y[j]; c1 = PetscDrawRealToColor(v[i+j*m],min,max); 246 x2 = x[i+1]; y2 = y_1; c2 = PetscDrawRealToColor(v[i+j*m+1],min,max); 247 x3 = x2; y3 = y[j+1]; c3 = PetscDrawRealToColor(v[i+j*m+1+m],min,max); 248 x4 = x1; y4 = y3; c4 = PetscDrawRealToColor(v[i+j*m+m],min,max); 249 250 ierr = PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 251 ierr = PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);CHKERRQ(ierr); 252 } 253 } 254 PetscFunctionReturn(0); 255 } 256