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: 49 All processors that share the draw MUST call this routine 50 51 .seealso: PetscDrawGetPopup(), PetscDrawTensorContour() 52 53 @*/ 54 PetscErrorCode PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max) 55 { 56 PetscBool isnull; 57 PetscReal xl = 0.0,yl = 0.0,xr = 1.0,yr = 1.0; 58 PetscMPIInt rank; 59 PetscErrorCode ierr; 60 int i; 61 char string[32]; 62 63 PetscFunctionBegin; 64 if (!popup) PetscFunctionReturn(0); 65 PetscValidHeaderSpecific(popup,PETSC_DRAW_CLASSID,1); 66 ierr = PetscDrawIsNull(popup,&isnull);CHKERRQ(ierr); 67 if (isnull) PetscFunctionReturn(0); 68 ierr = MPI_Comm_rank(PetscObjectComm((PetscObject)popup),&rank);CHKERRQ(ierr); 69 70 ierr = PetscDrawCheckResizedWindow(popup);CHKERRQ(ierr); 71 ierr = PetscDrawClear(popup);CHKERRQ(ierr); 72 ierr = PetscDrawSetTitle(popup,"Contour Scale");CHKERRQ(ierr); 73 ierr = PetscDrawSetCoordinates(popup,xl,yl,xr,yr);CHKERRQ(ierr); 74 ierr = PetscDrawCollectiveBegin(popup);CHKERRQ(ierr); 75 if (!rank) { 76 for (i=0; i<10; i++) { 77 int c = PetscDrawRealToColor((PetscReal)i/9,0,1); 78 ierr = PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);CHKERRQ(ierr); 79 yl += 0.1; 80 } 81 for (i=0; i<10; i++) { 82 PetscReal value = min + i*(max-min)/9; 83 /* look for a value that should be zero, but is not due to round-off */ 84 if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0; 85 ierr = PetscSNPrintf(string,sizeof(string),"%18.16e",(double)value);CHKERRQ(ierr); 86 ierr = PetscDrawString(popup,0.2,0.02+i/10.0,PETSC_DRAW_BLACK,string);CHKERRQ(ierr); 87 } 88 } 89 ierr = PetscDrawCollectiveEnd(popup);CHKERRQ(ierr); 90 ierr = PetscDrawFlush(popup);CHKERRQ(ierr); 91 ierr = PetscDrawSave(popup);CHKERRQ(ierr); 92 PetscFunctionReturn(0); 93 } 94 95 typedef struct { 96 int m,n; 97 PetscReal *x,*y,min,max,*v; 98 PetscBool showgrid; 99 } ZoomCtx; 100 101 static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx) 102 { 103 PetscErrorCode ierr; 104 int i; 105 ZoomCtx *ctx = (ZoomCtx*)dctx; 106 107 PetscFunctionBegin; 108 ierr = PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->min,ctx->max,ctx->v);CHKERRQ(ierr); 109 if (ctx->showgrid) { 110 for (i=0; i<ctx->m; i++) { 111 ierr = PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);CHKERRQ(ierr); 112 } 113 for (i=0; i<ctx->n; i++) { 114 ierr = PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);CHKERRQ(ierr); 115 } 116 } 117 PetscFunctionReturn(0); 118 } 119 120 /*@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(), PetscDrawScalePopup() 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 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 /*@ 206 PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot 207 for a two-dimensional array. 208 209 Not Collective 210 211 Input Parameters: 212 + draw - the draw context 213 . m,n - the number of local mesh points in the x and y direction 214 . x,y - the locations of the local mesh points 215 . min,max - the minimum and maximum value in the entire contour 216 - v - the data 217 218 Options Database Keys: 219 . -draw_x_shared_colormap - Activates private colormap 220 221 Level: advanced 222 223 Note: 224 This is a lower level support routine, usually the user will call 225 PetscDrawTensorContour(). 226 227 Concepts: contour plot 228 229 .seealso: PetscDrawTensorContour() 230 231 @*/ 232 PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal min,PetscReal max,PetscReal *v) 233 { 234 PetscErrorCode ierr; 235 int c1,c2,c3,c4,i,j; 236 PetscReal x1,x2,x3,x4,y_1,y2,y3,y4; 237 238 PetscFunctionBegin; 239 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 240 /* PetscDraw the contour plot patch */ 241 for (j=0; j<n-1; j++) { 242 for (i=0; i<m-1; i++) { 243 x1 = x[i]; y_1 = y[j]; c1 = PetscDrawRealToColor(v[i+j*m],min,max); 244 x2 = x[i+1]; y2 = y_1; c2 = PetscDrawRealToColor(v[i+j*m+1],min,max); 245 x3 = x2; y3 = y[j+1]; c3 = PetscDrawRealToColor(v[i+j*m+1+m],min,max); 246 x4 = x1; y4 = y3; c4 = PetscDrawRealToColor(v[i+j*m+m],min,max); 247 248 ierr = PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 249 ierr = PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);CHKERRQ(ierr); 250 } 251 } 252 PetscFunctionReturn(0); 253 } 254