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 PetscFunctionBegin; 24 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 25 PetscCheckFalse(!draw->ops->triangle,PETSC_COMM_SELF,PETSC_ERR_SUP,"This draw type %s does not support drawing triangles",((PetscObject)draw)->type_name); 26 CHKERRQ((*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3)); 27 PetscFunctionReturn(0); 28 } 29 30 /*@ 31 PetscDrawScalePopup - draws a contour scale window. 32 33 Collective on PetscDraw 34 35 Input Parameters: 36 + popup - the window (often a window obtained via PetscDrawGetPopup() 37 . min - minimum value being plotted 38 - max - maximum value being plotted 39 40 Level: intermediate 41 42 Notes: 43 All processors that share the draw MUST call this routine 44 45 .seealso: PetscDrawGetPopup(), PetscDrawTensorContour() 46 47 @*/ 48 PetscErrorCode PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max) 49 { 50 PetscBool isnull; 51 PetscReal xl = 0.0,yl = 0.0,xr = 1.0,yr = 1.0; 52 PetscMPIInt rank; 53 int i; 54 char string[32]; 55 PetscErrorCode ierr; 56 57 PetscFunctionBegin; 58 if (!popup) PetscFunctionReturn(0); 59 PetscValidHeaderSpecific(popup,PETSC_DRAW_CLASSID,1); 60 CHKERRQ(PetscDrawIsNull(popup,&isnull)); 61 if (isnull) PetscFunctionReturn(0); 62 CHKERRMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)popup),&rank)); 63 64 CHKERRQ(PetscDrawCheckResizedWindow(popup)); 65 CHKERRQ(PetscDrawClear(popup)); 66 CHKERRQ(PetscDrawSetTitle(popup,"Contour Scale")); 67 CHKERRQ(PetscDrawSetCoordinates(popup,xl,yl,xr,yr)); 68 ierr = PetscDrawCollectiveBegin(popup);CHKERRQ(ierr); 69 if (rank == 0) { 70 for (i=0; i<10; i++) { 71 int c = PetscDrawRealToColor((PetscReal)i/9,0,1); 72 CHKERRQ(PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c)); 73 yl += 0.1; 74 } 75 for (i=0; i<10; i++) { 76 PetscReal value = min + i*(max-min)/9; 77 /* look for a value that should be zero, but is not due to round-off */ 78 if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0; 79 CHKERRQ(PetscSNPrintf(string,sizeof(string),"%18.16e",(double)value)); 80 CHKERRQ(PetscDrawString(popup,0.2,0.02+i/10.0,PETSC_DRAW_BLACK,string)); 81 } 82 } 83 ierr = PetscDrawCollectiveEnd(popup);CHKERRQ(ierr); 84 CHKERRQ(PetscDrawFlush(popup)); 85 CHKERRQ(PetscDrawSave(popup)); 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 static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx) 96 { 97 int i; 98 ZoomCtx *ctx = (ZoomCtx*)dctx; 99 100 PetscFunctionBegin; 101 CHKERRQ(PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->min,ctx->max,ctx->v)); 102 if (ctx->showgrid) { 103 for (i=0; i<ctx->m; i++) { 104 CHKERRQ(PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK)); 105 } 106 for (i=0; i<ctx->n; i++) { 107 CHKERRQ(PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK)); 108 } 109 } 110 PetscFunctionReturn(0); 111 } 112 113 /*@C 114 PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array 115 that is stored as a PETSc vector. 116 117 Collective on PetscDraw, but PetscDraw must be sequential 118 119 Input Parameters: 120 + draw - the draw context 121 . m,n - the global number of mesh points in the x and y directions 122 . xi,yi - the locations of the global mesh points (optional, use NULL 123 to indicate uniform spacing on [0,1]) 124 - V - the values 125 126 Options Database Keys: 127 + -draw_x_shared_colormap - Indicates use of private colormap 128 - -draw_contour_grid - PetscDraws grid contour 129 130 Level: intermediate 131 132 .seealso: PetscDrawTensorContourPatch(), PetscDrawScalePopup() 133 134 @*/ 135 PetscErrorCode PetscDrawTensorContour(PetscDraw draw,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v) 136 { 137 int N = m*n; 138 PetscBool isnull; 139 PetscDraw popup; 140 int xin=1,yin=1,i; 141 PetscMPIInt size; 142 PetscReal h; 143 ZoomCtx ctx; 144 145 PetscFunctionBegin; 146 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 147 CHKERRQ(PetscDrawIsNull(draw,&isnull)); 148 if (isnull) PetscFunctionReturn(0); 149 CHKERRMPI(MPI_Comm_size(PetscObjectComm((PetscObject)draw),&size)); 150 PetscCheckFalse(size > 1,PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"May only be used with single processor PetscDraw"); 151 PetscCheckFalse(N <= 0,PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"n %d and m %d must be positive",m,n); 152 153 ctx.v = v; 154 ctx.m = m; 155 ctx.n = n; 156 ctx.max = ctx.min = v[0]; 157 for (i=0; i<N; i++) { 158 if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i]; 159 if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i]; 160 } 161 if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;} 162 163 /* PetscDraw the scale window */ 164 CHKERRQ(PetscDrawGetPopup(draw,&popup)); 165 CHKERRQ(PetscDrawScalePopup(popup,ctx.min,ctx.max)); 166 167 ctx.showgrid = PETSC_FALSE; 168 CHKERRQ(PetscOptionsGetBool(((PetscObject)draw)->options,NULL,"-draw_contour_grid",&ctx.showgrid,NULL)); 169 170 /* fill up x and y coordinates */ 171 if (!xi) { 172 xin = 0; 173 CHKERRQ(PetscMalloc1(ctx.m,&ctx.x)); 174 h = 1.0/(ctx.m-1); 175 ctx.x[0] = 0.0; 176 for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h; 177 } else ctx.x = (PetscReal*)xi; 178 179 if (!yi) { 180 yin = 0; 181 CHKERRQ(PetscMalloc1(ctx.n,&ctx.y)); 182 h = 1.0/(ctx.n-1); 183 ctx.y[0] = 0.0; 184 for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h; 185 } else ctx.y = (PetscReal*)yi; 186 187 CHKERRQ(PetscDrawZoom(draw,PetscDrawTensorContour_Zoom,&ctx)); 188 189 if (!xin) CHKERRQ(PetscFree(ctx.x)); 190 if (!yin) CHKERRQ(PetscFree(ctx.y)); 191 PetscFunctionReturn(0); 192 } 193 194 /*@ 195 PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot 196 for a two-dimensional array. 197 198 Not Collective 199 200 Input Parameters: 201 + draw - the draw context 202 . m,n - the number of local mesh points in the x and y direction 203 . x,y - the locations of the local mesh points 204 . min,max - the minimum and maximum value in the entire contour 205 - v - the data 206 207 Options Database Keys: 208 . -draw_x_shared_colormap - Activates private colormap 209 210 Level: advanced 211 212 Note: 213 This is a lower level support routine, usually the user will call 214 PetscDrawTensorContour(). 215 216 .seealso: PetscDrawTensorContour() 217 218 @*/ 219 PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal min,PetscReal max,PetscReal *v) 220 { 221 int c1,c2,c3,c4,i,j; 222 PetscReal x1,x2,x3,x4,y_1,y2,y3,y4; 223 224 PetscFunctionBegin; 225 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 226 /* PetscDraw the contour plot patch */ 227 for (j=0; j<n-1; j++) { 228 for (i=0; i<m-1; i++) { 229 x1 = x[i]; y_1 = y[j]; c1 = PetscDrawRealToColor(v[i+j*m],min,max); 230 x2 = x[i+1]; y2 = y_1; c2 = PetscDrawRealToColor(v[i+j*m+1],min,max); 231 x3 = x2; y3 = y[j+1]; c3 = PetscDrawRealToColor(v[i+j*m+1+m],min,max); 232 x4 = x1; y4 = y3; c4 = PetscDrawRealToColor(v[i+j*m+m],min,max); 233 234 CHKERRQ(PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3)); 235 CHKERRQ(PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4)); 236 } 237 } 238 PetscFunctionReturn(0); 239 } 240