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, 27 int c1,int c2,int c3) 28 { 29 PetscErrorCode ierr; 30 PetscBool isnull; 31 32 PetscFunctionBegin; 33 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 34 ierr = PetscObjectTypeCompare((PetscObject)draw,PETSC_DRAW_NULL,&isnull);CHKERRQ(ierr); 35 if (isnull) PetscFunctionReturn(0); 36 ierr = (*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 37 PetscFunctionReturn(0); 38 } 39 40 41 #undef __FUNCT__ 42 #define __FUNCT__ "PetscDrawScalePopup" 43 /*@ 44 PetscDrawScalePopup - PetscDraws a contour scale window. 45 46 Collective on PetscDraw 47 48 Input Parameters: 49 + popup - the window (often a window obtained via PetscDrawGetPopup() 50 . min - minimum value being plotted 51 - max - maximum value being plotted 52 53 Level: intermediate 54 55 Notes: 56 All processors that share the draw MUST call this routine 57 58 @*/ 59 PetscErrorCode PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max) 60 { 61 PetscReal xl = 0.0,yl = 0.0,xr = 2.0,yr = 1.0,value; 62 PetscErrorCode ierr; 63 int i,c = PETSC_DRAW_BASIC_COLORS,rank; 64 char string[32]; 65 MPI_Comm comm; 66 67 PetscFunctionBegin; 68 ierr = PetscDrawCheckResizedWindow(popup);CHKERRQ(ierr); 69 ierr = PetscObjectGetComm((PetscObject)popup,&comm);CHKERRQ(ierr); 70 ierr = MPI_Comm_rank(comm,&rank);CHKERRQ(ierr); 71 if (rank) PetscFunctionReturn(0); 72 73 for (i=0; i<10; i++) { 74 ierr = PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);CHKERRQ(ierr); 75 yl += .1; yr += .1; c = (int)((double)c + (245. - PETSC_DRAW_BASIC_COLORS)/9.); 76 } 77 for (i=0; i<10; i++) { 78 value = min + i*(max-min)/9.0; 79 /* look for a value that should be zero, but is not due to round-off */ 80 if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0; 81 sprintf(string,"%18.16e",(double)value); 82 ierr = PetscDrawString(popup,.2,.02 + i/10.0,PETSC_DRAW_BLACK,string);CHKERRQ(ierr); 83 } 84 ierr = PetscDrawSetTitle(popup,"Contour Scale");CHKERRQ(ierr); 85 ierr = PetscDrawFlush(popup);CHKERRQ(ierr); 86 PetscFunctionReturn(0); 87 } 88 89 typedef struct { 90 int m,n; 91 PetscReal *x,*y,min,max,*v; 92 PetscBool showgrid; 93 } ZoomCtx; 94 95 #undef __FUNCT__ 96 #define __FUNCT__ "PetscDrawTensorContour_Zoom" 97 static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx) 98 { 99 PetscErrorCode ierr; 100 int i; 101 ZoomCtx *ctx = (ZoomCtx*)dctx; 102 103 PetscFunctionBegin; 104 ierr = PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->max,ctx->min,ctx->v);CHKERRQ(ierr); 105 if (ctx->showgrid) { 106 for (i=0; i<ctx->m; i++) { 107 ierr = PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);CHKERRQ(ierr); 108 } 109 for (i=0; i<ctx->n; i++) { 110 ierr = PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);CHKERRQ(ierr); 111 } 112 } 113 PetscFunctionReturn(0); 114 } 115 116 #undef __FUNCT__ 117 #define __FUNCT__ "PetscDrawTensorContour" 118 /*@C 119 PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array 120 that is stored as a PETSc vector. 121 122 Collective on PetscDraw, but PetscDraw must be sequential 123 124 Input Parameters: 125 + win - the window to draw in 126 . m,n - the global number of mesh points in the x and y directions 127 . xi,yi - the locations of the global mesh points (optional, use PETSC_NULL 128 to indicate uniform spacing on [0,1]) 129 - V - the values 130 131 Options Database Keys: 132 + -draw_x_shared_colormap - Indicates use of private colormap 133 - -draw_contour_grid - PetscDraws grid contour 134 135 Level: intermediate 136 137 Concepts: contour plot 138 Concepts: drawing^contour plot 139 140 .seealso: PetscDrawTensorContourPatch() 141 142 @*/ 143 PetscErrorCode PetscDrawTensorContour(PetscDraw win,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v) 144 { 145 PetscErrorCode ierr; 146 int N = m*n; 147 PetscBool isnull; 148 PetscDraw popup; 149 MPI_Comm comm; 150 int xin=1,yin=1,i; 151 PetscMPIInt size; 152 PetscReal h; 153 ZoomCtx ctx; 154 155 PetscFunctionBegin; 156 ierr = PetscDrawIsNull(win,&isnull);CHKERRQ(ierr); if (isnull) PetscFunctionReturn(0); 157 ierr = PetscObjectGetComm((PetscObject)win,&comm);CHKERRQ(ierr); 158 ierr = MPI_Comm_size(comm,&size);CHKERRQ(ierr); 159 if (size > 1) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"May only be used with single processor PetscDraw"); 160 if (N <= 0) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"n %d and m %d must be positive",m,n); 161 162 /* create scale window */ 163 ierr = PetscDrawGetPopup(win,&popup);CHKERRQ(ierr); 164 ierr = PetscDrawCheckResizedWindow(win);CHKERRQ(ierr); 165 166 ctx.v = v; 167 ctx.m = m; 168 ctx.n = n; 169 ctx.max = ctx.min = v[0]; 170 for (i=0; i<N; i++) { 171 if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i]; 172 if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i]; 173 } 174 if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;} 175 176 /* PetscDraw the scale window */ 177 if (popup) {ierr = PetscDrawScalePopup(popup,ctx.min,ctx.max);CHKERRQ(ierr);} 178 179 ctx.showgrid = PETSC_FALSE; 180 ierr = PetscOptionsGetBool(PETSC_NULL,"-draw_contour_grid",&ctx.showgrid,PETSC_NULL);CHKERRQ(ierr); 181 182 /* fill up x and y coordinates */ 183 if (!xi) { 184 xin = 0; 185 ierr = PetscMalloc(ctx.m*sizeof(PetscReal),&ctx.x);CHKERRQ(ierr); 186 h = 1.0/(ctx.m-1); 187 ctx.x[0] = 0.0; 188 for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h; 189 } else { 190 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 { 199 ctx.y = (PetscReal *)yi; 200 } 201 202 ierr = PetscDrawZoom(win,(PetscErrorCode (*)(PetscDraw,void *))PetscDrawTensorContour_Zoom,&ctx);CHKERRQ(ierr); 203 204 if (!xin) {ierr = PetscFree(ctx.x);CHKERRQ(ierr);} 205 if (!yin) {ierr = PetscFree(ctx.y);CHKERRQ(ierr);} 206 207 PetscFunctionReturn(0); 208 } 209 210 #undef __FUNCT__ 211 #define __FUNCT__ "PetscDrawTensorContourPatch" 212 /*@ 213 PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot 214 for a two-dimensional array. 215 216 Not Collective 217 218 Input Parameters: 219 + win - the window to draw in 220 . m,n - the number of local mesh points in the x and y direction 221 . x,y - the locations of the local mesh points 222 . max,min - the maximum and minimum value in the entire contour 223 - v - the data 224 225 Options Database Keys: 226 . -draw_x_shared_colormap - Activates private colormap 227 228 Level: advanced 229 230 Note: 231 This is a lower level support routine, usually the user will call 232 PetscDrawTensorContour(). 233 234 Concepts: contour plot 235 236 .seealso: PetscDrawTensorContour() 237 238 @*/ 239 PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal max,PetscReal min,PetscReal *v) 240 { 241 PetscErrorCode ierr; 242 int c1,c2,c3,c4,i,j; 243 PetscReal x1,x2,x3,x4,y_1,y2,y3,y4,scale; 244 245 PetscFunctionBegin; 246 scale = (245.0 - PETSC_DRAW_BASIC_COLORS)/(max - min); 247 248 /* 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 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m] - min)); 252 x2 = x[i+1];y2 = y_1; c2 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1]-min)); 253 x3 = x2; y3 = y[j+1];c3 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1+m]-min)); 254 x4 = x1; y4 = y3; c4 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+m]-min)); 255 ierr = PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 256 ierr = PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);CHKERRQ(ierr); 257 } 258 } 259 260 PetscFunctionReturn(0); 261 } 262