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 PetscCheck(draw->ops->triangle,PETSC_COMM_SELF,PETSC_ERR_SUP,"This draw type %s does not support drawing triangles",((PetscObject)draw)->type_name); 26 PetscCall((*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 56 PetscFunctionBegin; 57 if (!popup) PetscFunctionReturn(0); 58 PetscValidHeaderSpecific(popup,PETSC_DRAW_CLASSID,1); 59 PetscCall(PetscDrawIsNull(popup,&isnull)); 60 if (isnull) PetscFunctionReturn(0); 61 PetscCallMPI(MPI_Comm_rank(PetscObjectComm((PetscObject)popup),&rank)); 62 63 PetscCall(PetscDrawCheckResizedWindow(popup)); 64 PetscCall(PetscDrawClear(popup)); 65 PetscCall(PetscDrawSetTitle(popup,"Contour Scale")); 66 PetscCall(PetscDrawSetCoordinates(popup,xl,yl,xr,yr)); 67 PetscDrawCollectiveBegin(popup); 68 if (rank == 0) { 69 for (i=0; i<10; i++) { 70 int c = PetscDrawRealToColor((PetscReal)i/9,0,1); 71 PetscCall(PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c)); 72 yl += 0.1; 73 } 74 for (i=0; i<10; i++) { 75 PetscReal value = min + i*(max-min)/9; 76 /* look for a value that should be zero, but is not due to round-off */ 77 if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0; 78 PetscCall(PetscSNPrintf(string,sizeof(string),"%18.16e",(double)value)); 79 PetscCall(PetscDrawString(popup,0.2,0.02+i/10.0,PETSC_DRAW_BLACK,string)); 80 } 81 } 82 PetscDrawCollectiveEnd(popup); 83 PetscCall(PetscDrawFlush(popup)); 84 PetscCall(PetscDrawSave(popup)); 85 PetscFunctionReturn(0); 86 } 87 88 typedef struct { 89 int m,n; 90 PetscReal *x,*y,min,max,*v; 91 PetscBool showgrid; 92 } ZoomCtx; 93 94 static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx) 95 { 96 int i; 97 ZoomCtx *ctx = (ZoomCtx*)dctx; 98 99 PetscFunctionBegin; 100 PetscCall(PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->min,ctx->max,ctx->v)); 101 if (ctx->showgrid) { 102 for (i=0; i<ctx->m; i++) { 103 PetscCall(PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK)); 104 } 105 for (i=0; i<ctx->n; i++) { 106 PetscCall(PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK)); 107 } 108 } 109 PetscFunctionReturn(0); 110 } 111 112 /*@C 113 PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array 114 that is stored as a PETSc vector. 115 116 Collective on PetscDraw, but PetscDraw must be sequential 117 118 Input Parameters: 119 + draw - the draw context 120 . m,n - the global number of mesh points in the x and y directions 121 . xi,yi - the locations of the global mesh points (optional, use NULL 122 to indicate uniform spacing on [0,1]) 123 - V - the values 124 125 Options Database Keys: 126 + -draw_x_shared_colormap - Indicates use of private colormap 127 - -draw_contour_grid - PetscDraws grid contour 128 129 Level: intermediate 130 131 .seealso: `PetscDrawTensorContourPatch()`, `PetscDrawScalePopup()` 132 133 @*/ 134 PetscErrorCode PetscDrawTensorContour(PetscDraw draw,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v) 135 { 136 int N = m*n; 137 PetscBool isnull; 138 PetscDraw popup; 139 int xin=1,yin=1,i; 140 PetscMPIInt size; 141 PetscReal h; 142 ZoomCtx ctx; 143 144 PetscFunctionBegin; 145 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 146 PetscCall(PetscDrawIsNull(draw,&isnull)); 147 if (isnull) PetscFunctionReturn(0); 148 PetscCallMPI(MPI_Comm_size(PetscObjectComm((PetscObject)draw),&size)); 149 PetscCheck(size <= 1,PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"May only be used with single processor PetscDraw"); 150 PetscCheck(N > 0,PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"n %d and m %d must be positive",m,n); 151 152 ctx.v = v; 153 ctx.m = m; 154 ctx.n = n; 155 ctx.max = ctx.min = v[0]; 156 for (i=0; i<N; i++) { 157 if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i]; 158 if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i]; 159 } 160 if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;} 161 162 /* PetscDraw the scale window */ 163 PetscCall(PetscDrawGetPopup(draw,&popup)); 164 PetscCall(PetscDrawScalePopup(popup,ctx.min,ctx.max)); 165 166 ctx.showgrid = PETSC_FALSE; 167 PetscCall(PetscOptionsGetBool(((PetscObject)draw)->options,NULL,"-draw_contour_grid",&ctx.showgrid,NULL)); 168 169 /* fill up x and y coordinates */ 170 if (!xi) { 171 xin = 0; 172 PetscCall(PetscMalloc1(ctx.m,&ctx.x)); 173 h = 1.0/(ctx.m-1); 174 ctx.x[0] = 0.0; 175 for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h; 176 } else ctx.x = (PetscReal*)xi; 177 178 if (!yi) { 179 yin = 0; 180 PetscCall(PetscMalloc1(ctx.n,&ctx.y)); 181 h = 1.0/(ctx.n-1); 182 ctx.y[0] = 0.0; 183 for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h; 184 } else ctx.y = (PetscReal*)yi; 185 186 PetscCall(PetscDrawZoom(draw,PetscDrawTensorContour_Zoom,&ctx)); 187 188 if (!xin) PetscCall(PetscFree(ctx.x)); 189 if (!yin) PetscCall(PetscFree(ctx.y)); 190 PetscFunctionReturn(0); 191 } 192 193 /*@ 194 PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot 195 for a two-dimensional array. 196 197 Not Collective 198 199 Input Parameters: 200 + draw - the draw context 201 . m,n - the number of local mesh points in the x and y direction 202 . x,y - the locations of the local mesh points 203 . min,max - the minimum and maximum value in the entire contour 204 - v - the data 205 206 Options Database Keys: 207 . -draw_x_shared_colormap - Activates private colormap 208 209 Level: advanced 210 211 Note: 212 This is a lower level support routine, usually the user will call 213 PetscDrawTensorContour(). 214 215 .seealso: `PetscDrawTensorContour()` 216 217 @*/ 218 PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal min,PetscReal max,PetscReal *v) 219 { 220 int c1,c2,c3,c4,i,j; 221 PetscReal x1,x2,x3,x4,y_1,y2,y3,y4; 222 223 PetscFunctionBegin; 224 PetscValidHeaderSpecific(draw,PETSC_DRAW_CLASSID,1); 225 /* PetscDraw the contour plot patch */ 226 for (j=0; j<n-1; j++) { 227 for (i=0; i<m-1; i++) { 228 x1 = x[i]; y_1 = y[j]; c1 = PetscDrawRealToColor(v[i+j*m],min,max); 229 x2 = x[i+1]; y2 = y_1; c2 = PetscDrawRealToColor(v[i+j*m+1],min,max); 230 x3 = x2; y3 = y[j+1]; c3 = PetscDrawRealToColor(v[i+j*m+1+m],min,max); 231 x4 = x1; y4 = y3; c4 = PetscDrawRealToColor(v[i+j*m+m],min,max); 232 233 PetscCall(PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3)); 234 PetscCall(PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4)); 235 } 236 } 237 PetscFunctionReturn(0); 238 } 239