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 if (!draw->ops->triangle) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"No triangles with this PetscDrawType"); 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 PetscMPIInt rank; 63 PetscErrorCode ierr; 64 int i,c = PETSC_DRAW_BASIC_COLORS; 65 char string[32]; 66 67 PetscFunctionBegin; 68 ierr = PetscDrawCheckResizedWindow(popup);CHKERRQ(ierr); 69 ierr = PetscDrawSynchronizedClear(popup);CHKERRQ(ierr); 70 ierr = PetscDrawCollectiveBegin(popup);CHKERRQ(ierr); 71 ierr = MPI_Comm_rank(PetscObjectComm((PetscObject)popup),&rank);CHKERRQ(ierr); 72 if (!rank) { 73 ierr = PetscDrawSetTitle(popup,"Contour Scale");CHKERRQ(ierr); 74 for (i=0; i<10; i++) { 75 ierr = PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);CHKERRQ(ierr); 76 yl += 0.1; yr += 0.1; 77 c = (int)((double)c + (245. - PETSC_DRAW_BASIC_COLORS)/9.); 78 } 79 for (i=0; i<10; i++) { 80 value = min + i*(max-min)/9.0; 81 /* look for a value that should be zero, but is not due to round-off */ 82 if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0; 83 ierr = PetscSNPrintf(string,sizeof(string),"%18.16e",(double)value);CHKERRQ(ierr); 84 ierr = PetscDrawString(popup,0.2,0.02 + i/10.0,PETSC_DRAW_BLACK,string);CHKERRQ(ierr); 85 } 86 ierr = PetscDrawFlush(popup);CHKERRQ(ierr); 87 } 88 ierr = PetscDrawCollectiveEnd(popup);CHKERRQ(ierr); 89 PetscFunctionReturn(0); 90 } 91 92 typedef struct { 93 int m,n; 94 PetscReal *x,*y,min,max,*v; 95 PetscBool showgrid; 96 } ZoomCtx; 97 98 #undef __FUNCT__ 99 #define __FUNCT__ "PetscDrawTensorContour_Zoom" 100 static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx) 101 { 102 PetscErrorCode ierr; 103 int i; 104 ZoomCtx *ctx = (ZoomCtx*)dctx; 105 106 PetscFunctionBegin; 107 ierr = PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->max,ctx->min,ctx->v);CHKERRQ(ierr); 108 if (ctx->showgrid) { 109 for (i=0; i<ctx->m; i++) { 110 ierr = PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);CHKERRQ(ierr); 111 } 112 for (i=0; i<ctx->n; i++) { 113 ierr = PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);CHKERRQ(ierr); 114 } 115 } 116 PetscFunctionReturn(0); 117 } 118 119 #undef __FUNCT__ 120 #define __FUNCT__ "PetscDrawTensorContour" 121 /*@C 122 PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array 123 that is stored as a PETSc vector. 124 125 Collective on PetscDraw, but PetscDraw must be sequential 126 127 Input Parameters: 128 + win - the window to draw in 129 . m,n - the global number of mesh points in the x and y directions 130 . xi,yi - the locations of the global mesh points (optional, use NULL 131 to indicate uniform spacing on [0,1]) 132 - V - the values 133 134 Options Database Keys: 135 + -draw_x_shared_colormap - Indicates use of private colormap 136 - -draw_contour_grid - PetscDraws grid contour 137 138 Level: intermediate 139 140 Concepts: contour plot 141 Concepts: drawing^contour plot 142 143 .seealso: PetscDrawTensorContourPatch() 144 145 @*/ 146 PetscErrorCode PetscDrawTensorContour(PetscDraw win,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v) 147 { 148 PetscErrorCode ierr; 149 int N = m*n; 150 PetscBool isnull; 151 PetscDraw popup; 152 int xin=1,yin=1,i; 153 PetscMPIInt size; 154 PetscReal h; 155 ZoomCtx ctx; 156 157 PetscFunctionBegin; 158 ierr = PetscDrawIsNull(win,&isnull);CHKERRQ(ierr); 159 if (isnull) PetscFunctionReturn(0); 160 ierr = MPI_Comm_size(PetscObjectComm((PetscObject)win),&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(win,&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)win)->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(win,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 + win - the window to draw in 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 . max,min - the maximum and minimum 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 max,PetscReal min,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,scale; 239 240 PetscFunctionBegin; 241 scale = (245.0 - PETSC_DRAW_BASIC_COLORS)/(max - min); 242 243 /* PetscDraw the contour plot patch */ 244 for (j=0; j<n-1; j++) { 245 for (i=0; i<m-1; i++) { 246 x1 = x[i]; y_1 = y[j]; c1 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m] - min)); 247 x2 = x[i+1];y2 = y_1; c2 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1]-min)); 248 x3 = x2; y3 = y[j+1];c3 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1+m]-min)); 249 x4 = x1; y4 = y3; c4 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+m]-min)); 250 251 ierr = PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 252 ierr = PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);CHKERRQ(ierr); 253 } 254 } 255 PetscFunctionReturn(0); 256 } 257