Actual source code: dtri.c
petsc-3.9.4 2018-09-11
2: /*
3: Provides the calling sequences for all the basic PetscDraw routines.
4: */
5: #include <petsc/private/drawimpl.h>
7: /*@
8: PetscDrawTriangle - PetscDraws a triangle onto a drawable.
10: Not Collective
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
17: Level: beginner
19: Concepts: drawing^triangle
20: Concepts: graphics^triangle
21: Concepts: triangle
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: {
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: (*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
33: return(0);
34: }
36: /*@
37: PetscDrawScalePopup - draws a contour scale window.
39: Collective on PetscDraw
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
46: Level: intermediate
48: Notes: All processors that share the draw MUST call this routine
50: .seealso: PetscDrawGetPopup(), PetscDrawTensorContour()
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;
59: int i;
60: char string[32];
63: if (!popup) return(0);
65: PetscDrawIsNull(popup,&isnull);
66: if (isnull) return(0);
67: MPI_Comm_rank(PetscObjectComm((PetscObject)popup),&rank);
69: PetscDrawCheckResizedWindow(popup);
70: PetscDrawClear(popup);
71: PetscDrawSetTitle(popup,"Contour Scale");
72: PetscDrawSetCoordinates(popup,xl,yl,xr,yr);
73: PetscDrawCollectiveBegin(popup);
74: if (!rank) {
75: for (i=0; i<10; i++) {
76: int c = PetscDrawRealToColor((PetscReal)i/9,0,1);
77: PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);
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: PetscSNPrintf(string,sizeof(string),"%18.16e",(double)value);
85: PetscDrawString(popup,0.2,0.02+i/10.0,PETSC_DRAW_BLACK,string);
86: }
87: }
88: PetscDrawCollectiveEnd(popup);
89: PetscDrawFlush(popup);
90: PetscDrawSave(popup);
91: return(0);
92: }
94: typedef struct {
95: int m,n;
96: PetscReal *x,*y,min,max,*v;
97: PetscBool showgrid;
98: } ZoomCtx;
100: static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx)
101: {
103: int i;
104: ZoomCtx *ctx = (ZoomCtx*)dctx;
107: PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->min,ctx->max,ctx->v);
108: if (ctx->showgrid) {
109: for (i=0; i<ctx->m; i++) {
110: PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);
111: }
112: for (i=0; i<ctx->n; i++) {
113: PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);
114: }
115: }
116: return(0);
117: }
119: /*@C
120: PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array
121: that is stored as a PETSc vector.
123: Collective on PetscDraw, but PetscDraw must be sequential
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
132: Options Database Keys:
133: + -draw_x_shared_colormap - Indicates use of private colormap
134: - -draw_contour_grid - PetscDraws grid contour
136: Level: intermediate
138: Concepts: contour plot
139: Concepts: drawing^contour plot
141: .seealso: PetscDrawTensorContourPatch(), PetscDrawScalePopup()
143: @*/
144: PetscErrorCode PetscDrawTensorContour(PetscDraw draw,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v)
145: {
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;
157: PetscDrawIsNull(draw,&isnull);
158: if (isnull) return(0);
159: MPI_Comm_size(PetscObjectComm((PetscObject)draw),&size);
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);
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;}
173: /* PetscDraw the scale window */
174: PetscDrawGetPopup(draw,&popup);
175: PetscDrawScalePopup(popup,ctx.min,ctx.max);
177: ctx.showgrid = PETSC_FALSE;
178: PetscOptionsGetBool(((PetscObject)draw)->options,NULL,"-draw_contour_grid",&ctx.showgrid,NULL);
180: /* fill up x and y coordinates */
181: if (!xi) {
182: xin = 0;
183: PetscMalloc1(ctx.m,&ctx.x);
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;
189: if (!yi) {
190: yin = 0;
191: PetscMalloc1(ctx.n,&ctx.y);
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;
197: PetscDrawZoom(draw,PetscDrawTensorContour_Zoom,&ctx);
199: if (!xin) {PetscFree(ctx.x);}
200: if (!yin) {PetscFree(ctx.y);}
201: return(0);
202: }
204: /*@
205: PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot
206: for a two-dimensional array.
208: Not Collective
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
217: Options Database Keys:
218: . -draw_x_shared_colormap - Activates private colormap
220: Level: advanced
222: Note:
223: This is a lower level support routine, usually the user will call
224: PetscDrawTensorContour().
226: Concepts: contour plot
228: .seealso: PetscDrawTensorContour()
230: @*/
231: PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal min,PetscReal max,PetscReal *v)
232: {
234: int c1,c2,c3,c4,i,j;
235: PetscReal x1,x2,x3,x4,y_1,y2,y3,y4;
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);
247: PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
248: PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);
249: }
250: }
251: return(0);
252: }