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 .seealso: PetscDrawLine(), PetscDrawRectangle(), PetscDrawEllipse(), PetscDrawMarker(), PetscDrawPoint(), PetscDrawArrow() 20 @*/ 21 PetscErrorCode PetscDrawTriangle(PetscDraw draw,PetscReal x1,PetscReal y_1,PetscReal x2,PetscReal y2,PetscReal x3,PetscReal y3,int c1,int c2,int c3) 22 { 23 PetscErrorCode ierr; 24 25 PetscFunctionBegin; 26 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 27 if (!draw->ops->triangle) SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"This draw type %s does not support drawing triangles",((PetscObject)draw)->type_name); 28 ierr = (*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 29 PetscFunctionReturn(0); 30 } 31 32 /*@ 33 PetscDrawScalePopup - draws a contour scale window. 34 35 Collective on PetscDraw 36 37 Input Parameters: 38 + popup - the window (often a window obtained via PetscDrawGetPopup() 39 . min - minimum value being plotted 40 - max - maximum value being plotted 41 42 Level: intermediate 43 44 Notes: 45 All processors that share the draw MUST call this routine 46 47 .seealso: PetscDrawGetPopup(), PetscDrawTensorContour() 48 49 @*/ 50 PetscErrorCode PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max) 51 { 52 PetscBool isnull; 53 PetscReal xl = 0.0,yl = 0.0,xr = 1.0,yr = 1.0; 54 PetscMPIInt rank; 55 PetscErrorCode ierr; 56 int i; 57 char string[32]; 58 59 PetscFunctionBegin; 60 if (!popup) PetscFunctionReturn(0); 61 PetscValidHeaderSpecific(popup,PETSC_DRAW_CLASSID,1); 62 ierr = PetscDrawIsNull(popup,&isnull);CHKERRQ(ierr); 63 if (isnull) PetscFunctionReturn(0); 64 ierr = MPI_Comm_rank(PetscObjectComm((PetscObject)popup),&rank);CHKERRQ(ierr); 65 66 ierr = PetscDrawCheckResizedWindow(popup);CHKERRQ(ierr); 67 ierr = PetscDrawClear(popup);CHKERRQ(ierr); 68 ierr = PetscDrawSetTitle(popup,"Contour Scale");CHKERRQ(ierr); 69 ierr = PetscDrawSetCoordinates(popup,xl,yl,xr,yr);CHKERRQ(ierr); 70 ierr = PetscDrawCollectiveBegin(popup);CHKERRQ(ierr); 71 if (!rank) { 72 for (i=0; i<10; i++) { 73 int c = PetscDrawRealToColor((PetscReal)i/9,0,1); 74 ierr = PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);CHKERRQ(ierr); 75 yl += 0.1; 76 } 77 for (i=0; i<10; i++) { 78 PetscReal value = min + i*(max-min)/9; 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 ierr = PetscSNPrintf(string,sizeof(string),"%18.16e",(double)value);CHKERRQ(ierr); 82 ierr = PetscDrawString(popup,0.2,0.02+i/10.0,PETSC_DRAW_BLACK,string);CHKERRQ(ierr); 83 } 84 } 85 ierr = PetscDrawCollectiveEnd(popup);CHKERRQ(ierr); 86 ierr = PetscDrawFlush(popup);CHKERRQ(ierr); 87 ierr = PetscDrawSave(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 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->min,ctx->max,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 /*@C 117 PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array 118 that is stored as a PETSc vector. 119 120 Collective on PetscDraw, but PetscDraw must be sequential 121 122 Input Parameters: 123 + draw - the draw context 124 . m,n - the global number of mesh points in the x and y directions 125 . xi,yi - the locations of the global mesh points (optional, use NULL 126 to indicate uniform spacing on [0,1]) 127 - V - the values 128 129 Options Database Keys: 130 + -draw_x_shared_colormap - Indicates use of private colormap 131 - -draw_contour_grid - PetscDraws grid contour 132 133 Level: intermediate 134 135 136 .seealso: PetscDrawTensorContourPatch(), PetscDrawScalePopup() 137 138 @*/ 139 PetscErrorCode PetscDrawTensorContour(PetscDraw draw,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v) 140 { 141 PetscErrorCode ierr; 142 int N = m*n; 143 PetscBool isnull; 144 PetscDraw popup; 145 int xin=1,yin=1,i; 146 PetscMPIInt size; 147 PetscReal h; 148 ZoomCtx ctx; 149 150 PetscFunctionBegin; 151 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 152 ierr = PetscDrawIsNull(draw,&isnull);CHKERRQ(ierr); 153 if (isnull) PetscFunctionReturn(0); 154 ierr = MPI_Comm_size(PetscObjectComm((PetscObject)draw),&size);CHKERRQ(ierr); 155 if (size > 1) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"May only be used with single processor PetscDraw"); 156 if (N <= 0) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"n %d and m %d must be positive",m,n); 157 158 ctx.v = v; 159 ctx.m = m; 160 ctx.n = n; 161 ctx.max = ctx.min = v[0]; 162 for (i=0; i<N; i++) { 163 if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i]; 164 if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i]; 165 } 166 if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;} 167 168 /* PetscDraw the scale window */ 169 ierr = PetscDrawGetPopup(draw,&popup);CHKERRQ(ierr); 170 ierr = PetscDrawScalePopup(popup,ctx.min,ctx.max);CHKERRQ(ierr); 171 172 ctx.showgrid = PETSC_FALSE; 173 ierr = PetscOptionsGetBool(((PetscObject)draw)->options,NULL,"-draw_contour_grid",&ctx.showgrid,NULL);CHKERRQ(ierr); 174 175 /* fill up x and y coordinates */ 176 if (!xi) { 177 xin = 0; 178 ierr = PetscMalloc1(ctx.m,&ctx.x);CHKERRQ(ierr); 179 h = 1.0/(ctx.m-1); 180 ctx.x[0] = 0.0; 181 for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h; 182 } else ctx.x = (PetscReal*)xi; 183 184 if (!yi) { 185 yin = 0; 186 ierr = PetscMalloc1(ctx.n,&ctx.y);CHKERRQ(ierr); 187 h = 1.0/(ctx.n-1); 188 ctx.y[0] = 0.0; 189 for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h; 190 } else ctx.y = (PetscReal*)yi; 191 192 ierr = PetscDrawZoom(draw,PetscDrawTensorContour_Zoom,&ctx);CHKERRQ(ierr); 193 194 if (!xin) {ierr = PetscFree(ctx.x);CHKERRQ(ierr);} 195 if (!yin) {ierr = PetscFree(ctx.y);CHKERRQ(ierr);} 196 PetscFunctionReturn(0); 197 } 198 199 /*@ 200 PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot 201 for a two-dimensional array. 202 203 Not Collective 204 205 Input Parameters: 206 + draw - the draw context 207 . m,n - the number of local mesh points in the x and y direction 208 . x,y - the locations of the local mesh points 209 . min,max - the minimum and maximum value in the entire contour 210 - v - the data 211 212 Options Database Keys: 213 . -draw_x_shared_colormap - Activates private colormap 214 215 Level: advanced 216 217 Note: 218 This is a lower level support routine, usually the user will call 219 PetscDrawTensorContour(). 220 221 .seealso: PetscDrawTensorContour() 222 223 @*/ 224 PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal min,PetscReal max,PetscReal *v) 225 { 226 PetscErrorCode ierr; 227 int c1,c2,c3,c4,i,j; 228 PetscReal x1,x2,x3,x4,y_1,y2,y3,y4; 229 230 PetscFunctionBegin; 231 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 232 /* PetscDraw the contour plot patch */ 233 for (j=0; j<n-1; j++) { 234 for (i=0; i<m-1; i++) { 235 x1 = x[i]; y_1 = y[j]; c1 = PetscDrawRealToColor(v[i+j*m],min,max); 236 x2 = x[i+1]; y2 = y_1; c2 = PetscDrawRealToColor(v[i+j*m+1],min,max); 237 x3 = x2; y3 = y[j+1]; c3 = PetscDrawRealToColor(v[i+j*m+1+m],min,max); 238 x4 = x1; y4 = y3; c4 = PetscDrawRealToColor(v[i+j*m+m],min,max); 239 240 ierr = PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);CHKERRQ(ierr); 241 ierr = PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);CHKERRQ(ierr); 242 } 243 } 244 PetscFunctionReturn(0); 245 } 246