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 /*@ 8 PetscDrawTriangle - PetscDraws a triangle onto a drawable. 9 10 Not Collective 11 12 Input Parameters: 13 + draw - the drawing context 14 . x1,y1,x2,y2,x3,y3 - the coordinates of the vertices 15 - c1,c2,c3 - the colors of the three vertices in the same order as the xi,yi 16 17 Level: beginner 18 19 Concepts: drawing^triangle 20 Concepts: graphics^triangle 21 Concepts: triangle 22 23 .seealso: PetscDrawLine(), PetscDrawRectangle(), PetscDrawEllipse(), PetscDrawMarker(), PetscDrawPoint(), PetscDrawArrow() 24 @*/ 25 PetscErrorCode PetscDrawTriangle(PetscDraw draw,PetscReal x1,PetscReal y_1,PetscReal x2,PetscReal y2,PetscReal x3,PetscReal y3,int c1,int c2,int c3) 26 { 27 PetscErrorCode ierr; 28 29 PetscFunctionBegin; 30 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 31 if (!draw->ops->triangle) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"This draw type %s does not support drawing triangles",((PetscObject)draw)->type_name); 32 ierr = (*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 33 PetscFunctionReturn(0); 34 } 35 36 /*@ 37 PetscDrawScalePopup - draws a contour scale window. 38 39 Collective on PetscDraw 40 41 Input Parameters: 42 + popup - the window (often a window obtained via PetscDrawGetPopup() 43 . min - minimum value being plotted 44 - max - maximum value being plotted 45 46 Level: intermediate 47 48 Notes: All processors that share the draw MUST call this routine 49 50 .seealso: PetscDrawGetPopup(), PetscDrawTensorContour() 51 52 @*/ 53 PetscErrorCode PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max) 54 { 55 PetscBool isnull; 56 PetscReal xl = 0.0,yl = 0.0,xr = 1.0,yr = 1.0; 57 PetscMPIInt rank; 58 PetscErrorCode ierr; 59 int i; 60 char string[32]; 61 62 PetscFunctionBegin; 63 if (!popup) PetscFunctionReturn(0); 64 PetscValidHeaderSpecific(popup,PETSC_DRAW_CLASSID,1); 65 ierr = PetscDrawIsNull(popup,&isnull);CHKERRQ(ierr); 66 if (isnull) PetscFunctionReturn(0); 67 ierr = MPI_Comm_rank(PetscObjectComm((PetscObject)popup),&rank);CHKERRQ(ierr); 68 69 ierr = PetscDrawCheckResizedWindow(popup);CHKERRQ(ierr); 70 ierr = PetscDrawClear(popup);CHKERRQ(ierr); 71 ierr = PetscDrawSetTitle(popup,"Contour Scale");CHKERRQ(ierr); 72 ierr = PetscDrawSetCoordinates(popup,xl,yl,xr,yr);CHKERRQ(ierr); 73 ierr = PetscDrawCollectiveBegin(popup);CHKERRQ(ierr); 74 if (!rank) { 75 for (i=0; i<10; i++) { 76 int c = PetscDrawRealToColor((PetscReal)i/9,0,1); 77 ierr = PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);CHKERRQ(ierr); 78 yl += 0.1; 79 } 80 for (i=0; i<10; i++) { 81 PetscReal value = min + i*(max-min)/9; 82 /* look for a value that should be zero, but is not due to round-off */ 83 if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0; 84 ierr = PetscSNPrintf(string,sizeof(string),"%18.16e",(double)value);CHKERRQ(ierr); 85 ierr = PetscDrawString(popup,0.2,0.02+i/10.0,PETSC_DRAW_BLACK,string);CHKERRQ(ierr); 86 } 87 } 88 ierr = PetscDrawCollectiveEnd(popup);CHKERRQ(ierr); 89 ierr = PetscDrawFlush(popup);CHKERRQ(ierr); 90 ierr = PetscDrawSave(popup);CHKERRQ(ierr); 91 PetscFunctionReturn(0); 92 } 93 94 typedef struct { 95 int m,n; 96 PetscReal *x,*y,min,max,*v; 97 PetscBool showgrid; 98 } ZoomCtx; 99 100 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->min,ctx->max,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 /*@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 + draw - the draw context 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(), PetscDrawScalePopup() 142 143 @*/ 144 PetscErrorCode PetscDrawTensorContour(PetscDraw draw,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 int xin=1,yin=1,i; 151 PetscMPIInt size; 152 PetscReal h; 153 ZoomCtx ctx; 154 155 PetscFunctionBegin; 156 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 157 ierr = PetscDrawIsNull(draw,&isnull);CHKERRQ(ierr); 158 if (isnull) PetscFunctionReturn(0); 159 ierr = MPI_Comm_size(PetscObjectComm((PetscObject)draw),&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 ctx.v = v; 164 ctx.m = m; 165 ctx.n = n; 166 ctx.max = ctx.min = v[0]; 167 for (i=0; i<N; i++) { 168 if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i]; 169 if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i]; 170 } 171 if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;} 172 173 /* PetscDraw the scale window */ 174 ierr = PetscDrawGetPopup(draw,&popup);CHKERRQ(ierr); 175 ierr = PetscDrawScalePopup(popup,ctx.min,ctx.max);CHKERRQ(ierr); 176 177 ctx.showgrid = PETSC_FALSE; 178 ierr = PetscOptionsGetBool(((PetscObject)draw)->options,NULL,"-draw_contour_grid",&ctx.showgrid,NULL);CHKERRQ(ierr); 179 180 /* fill up x and y coordinates */ 181 if (!xi) { 182 xin = 0; 183 ierr = PetscMalloc1(ctx.m,&ctx.x);CHKERRQ(ierr); 184 h = 1.0/(ctx.m-1); 185 ctx.x[0] = 0.0; 186 for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h; 187 } else ctx.x = (PetscReal*)xi; 188 189 if (!yi) { 190 yin = 0; 191 ierr = PetscMalloc1(ctx.n,&ctx.y);CHKERRQ(ierr); 192 h = 1.0/(ctx.n-1); 193 ctx.y[0] = 0.0; 194 for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h; 195 } else ctx.y = (PetscReal*)yi; 196 197 ierr = PetscDrawZoom(draw,PetscDrawTensorContour_Zoom,&ctx);CHKERRQ(ierr); 198 199 if (!xin) {ierr = PetscFree(ctx.x);CHKERRQ(ierr);} 200 if (!yin) {ierr = PetscFree(ctx.y);CHKERRQ(ierr);} 201 PetscFunctionReturn(0); 202 } 203 204 /*@ 205 PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot 206 for a two-dimensional array. 207 208 Not Collective 209 210 Input Parameters: 211 + draw - the draw context 212 . m,n - the number of local mesh points in the x and y direction 213 . x,y - the locations of the local mesh points 214 . min,max - the minimum and maximum value in the entire contour 215 - v - the data 216 217 Options Database Keys: 218 . -draw_x_shared_colormap - Activates private colormap 219 220 Level: advanced 221 222 Note: 223 This is a lower level support routine, usually the user will call 224 PetscDrawTensorContour(). 225 226 Concepts: contour plot 227 228 .seealso: PetscDrawTensorContour() 229 230 @*/ 231 PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal min,PetscReal max,PetscReal *v) 232 { 233 PetscErrorCode ierr; 234 int c1,c2,c3,c4,i,j; 235 PetscReal x1,x2,x3,x4,y_1,y2,y3,y4; 236 237 PetscFunctionBegin; 238 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 239 /* PetscDraw the contour plot patch */ 240 for (j=0; j<n-1; j++) { 241 for (i=0; i<m-1; i++) { 242 x1 = x[i]; y_1 = y[j]; c1 = PetscDrawRealToColor(v[i+j*m],min,max); 243 x2 = x[i+1]; y2 = y_1; c2 = PetscDrawRealToColor(v[i+j*m+1],min,max); 244 x3 = x2; y3 = y[j+1]; c3 = PetscDrawRealToColor(v[i+j*m+1+m],min,max); 245 x4 = x1; y4 = y3; c4 = PetscDrawRealToColor(v[i+j*m+m],min,max); 246 247 ierr = PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 248 ierr = PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);CHKERRQ(ierr); 249 } 250 } 251 PetscFunctionReturn(0); 252 } 253