Actual source code: gr1.c
2: /*
3: Plots vectors obtained with DMDACreate1d()
4: */
6: #include <petsc/private/dmdaimpl.h>
8: /*@
9: DMDASetUniformCoordinates - Sets a DMDA coordinates to be a uniform grid
11: Collective on da
13: Input Parameters:
14: + da - the distributed array object
15: . xmin,xmax - extremes in the x direction
16: . ymin,ymax - extremes in the y direction (value ignored for 1 dimensional problems)
17: - zmin,zmax - extremes in the z direction (value ignored for 1 or 2 dimensional problems)
19: Level: beginner
21: .seealso: `DMSetCoordinates()`, `DMGetCoordinates()`, `DMDACreate1d()`, `DMDACreate2d()`, `DMDACreate3d()`, `DMStagSetUniformCoordinates()`
23: @*/
24: PetscErrorCode DMDASetUniformCoordinates(DM da, PetscReal xmin, PetscReal xmax, PetscReal ymin, PetscReal ymax, PetscReal zmin, PetscReal zmax)
25: {
26: MPI_Comm comm;
27: DM cda;
28: DM_DA *dd = (DM_DA *)da->data;
29: DMBoundaryType bx, by, bz;
30: Vec xcoor;
31: PetscScalar *coors;
32: PetscReal hx, hy, hz_;
33: PetscInt i, j, k, M, N, P, istart, isize, jstart, jsize, kstart, ksize, dim, cnt;
37: DMDAGetInfo(da, &dim, &M, &N, &P, NULL, NULL, NULL, NULL, NULL, &bx, &by, &bz, NULL);
41: PetscObjectGetComm((PetscObject)da, &comm);
42: DMDAGetCorners(da, &istart, &jstart, &kstart, &isize, &jsize, &ksize);
43: DMGetCoordinateDM(da, &cda);
44: DMCreateGlobalVector(cda, &xcoor);
45: if (dim == 1) {
46: if (bx == DM_BOUNDARY_PERIODIC) hx = (xmax - xmin) / M;
47: else hx = (xmax - xmin) / (M - 1);
48: VecGetArray(xcoor, &coors);
49: for (i = 0; i < isize; i++) coors[i] = xmin + hx * (i + istart);
50: VecRestoreArray(xcoor, &coors);
51: } else if (dim == 2) {
52: if (bx == DM_BOUNDARY_PERIODIC) hx = (xmax - xmin) / (M);
53: else hx = (xmax - xmin) / (M - 1);
54: if (by == DM_BOUNDARY_PERIODIC) hy = (ymax - ymin) / (N);
55: else hy = (ymax - ymin) / (N - 1);
56: VecGetArray(xcoor, &coors);
57: cnt = 0;
58: for (j = 0; j < jsize; j++) {
59: for (i = 0; i < isize; i++) {
60: coors[cnt++] = xmin + hx * (i + istart);
61: coors[cnt++] = ymin + hy * (j + jstart);
62: }
63: }
64: VecRestoreArray(xcoor, &coors);
65: } else if (dim == 3) {
66: if (bx == DM_BOUNDARY_PERIODIC) hx = (xmax - xmin) / (M);
67: else hx = (xmax - xmin) / (M - 1);
68: if (by == DM_BOUNDARY_PERIODIC) hy = (ymax - ymin) / (N);
69: else hy = (ymax - ymin) / (N - 1);
70: if (bz == DM_BOUNDARY_PERIODIC) hz_ = (zmax - zmin) / (P);
71: else hz_ = (zmax - zmin) / (P - 1);
72: VecGetArray(xcoor, &coors);
73: cnt = 0;
74: for (k = 0; k < ksize; k++) {
75: for (j = 0; j < jsize; j++) {
76: for (i = 0; i < isize; i++) {
77: coors[cnt++] = xmin + hx * (i + istart);
78: coors[cnt++] = ymin + hy * (j + jstart);
79: coors[cnt++] = zmin + hz_ * (k + kstart);
80: }
81: }
82: }
83: VecRestoreArray(xcoor, &coors);
84: } else SETERRQ(PetscObjectComm((PetscObject)da), PETSC_ERR_SUP, "Cannot create uniform coordinates for this dimension %" PetscInt_FMT, dim);
85: DMSetCoordinates(da, xcoor);
86: VecDestroy(&xcoor);
87: return 0;
88: }
90: /*
91: Allows a user to select a subset of the fields to be drawn by VecView() when the vector comes from a DMDA
92: */
93: PetscErrorCode DMDASelectFields(DM da, PetscInt *outfields, PetscInt **fields)
94: {
95: PetscInt step, ndisplayfields, *displayfields, k, j;
96: PetscBool flg;
98: DMDAGetInfo(da, NULL, NULL, NULL, NULL, NULL, NULL, NULL, &step, NULL, NULL, NULL, NULL, NULL);
99: PetscMalloc1(step, &displayfields);
100: for (k = 0; k < step; k++) displayfields[k] = k;
101: ndisplayfields = step;
102: PetscOptionsGetIntArray(NULL, NULL, "-draw_fields", displayfields, &ndisplayfields, &flg);
103: if (!ndisplayfields) ndisplayfields = step;
104: if (!flg) {
105: char **fields;
106: const char *fieldname;
107: PetscInt nfields = step;
108: PetscMalloc1(step, &fields);
109: PetscOptionsGetStringArray(NULL, NULL, "-draw_fields_by_name", fields, &nfields, &flg);
110: if (flg) {
111: ndisplayfields = 0;
112: for (k = 0; k < nfields; k++) {
113: for (j = 0; j < step; j++) {
114: DMDAGetFieldName(da, j, &fieldname);
115: PetscStrcmp(fieldname, fields[k], &flg);
116: if (flg) goto found;
117: }
118: SETERRQ(PetscObjectComm((PetscObject)da), PETSC_ERR_USER, "Unknown fieldname %s", fields[k]);
119: found:
120: displayfields[ndisplayfields++] = j;
121: }
122: }
123: for (k = 0; k < nfields; k++) PetscFree(fields[k]);
124: PetscFree(fields);
125: }
126: *fields = displayfields;
127: *outfields = ndisplayfields;
128: return 0;
129: }
131: #include <petscdraw.h>
133: PetscErrorCode VecView_MPI_Draw_DA1d(Vec xin, PetscViewer v)
134: {
135: DM da;
136: PetscMPIInt rank, size, tag;
137: PetscInt i, n, N, dof, istart, isize, j, nbounds;
138: MPI_Status status;
139: PetscReal min, max, xmin = 0.0, xmax = 0.0, tmp = 0.0, xgtmp = 0.0;
140: const PetscScalar *array, *xg;
141: PetscDraw draw;
142: PetscBool isnull, useports = PETSC_FALSE, showmarkers = PETSC_FALSE;
143: MPI_Comm comm;
144: PetscDrawAxis axis;
145: Vec xcoor;
146: DMBoundaryType bx;
147: const char *tlabel = NULL, *xlabel = NULL;
148: const PetscReal *bounds;
149: PetscInt *displayfields;
150: PetscInt k, ndisplayfields;
151: PetscBool hold;
152: PetscDrawViewPorts *ports = NULL;
153: PetscViewerFormat format;
155: PetscViewerDrawGetDraw(v, 0, &draw);
156: PetscDrawIsNull(draw, &isnull);
157: if (isnull) return 0;
158: PetscViewerDrawGetBounds(v, &nbounds, &bounds);
160: VecGetDM(xin, &da);
162: PetscObjectGetComm((PetscObject)xin, &comm);
163: MPI_Comm_size(comm, &size);
164: MPI_Comm_rank(comm, &rank);
166: PetscOptionsGetBool(NULL, NULL, "-draw_vec_use_markers", &showmarkers, NULL);
168: DMDAGetInfo(da, NULL, &N, NULL, NULL, NULL, NULL, NULL, &dof, NULL, &bx, NULL, NULL, NULL);
169: DMDAGetCorners(da, &istart, NULL, NULL, &isize, NULL, NULL);
170: VecGetArrayRead(xin, &array);
171: VecGetLocalSize(xin, &n);
172: n = n / dof;
174: /* Get coordinates of nodes */
175: DMGetCoordinates(da, &xcoor);
176: if (!xcoor) {
177: DMDASetUniformCoordinates(da, 0.0, 1.0, 0.0, 0.0, 0.0, 0.0);
178: DMGetCoordinates(da, &xcoor);
179: }
180: VecGetArrayRead(xcoor, &xg);
181: DMDAGetCoordinateName(da, 0, &xlabel);
183: /* Determine the min and max coordinate in plot */
184: if (rank == 0) xmin = PetscRealPart(xg[0]);
185: if (rank == size - 1) xmax = PetscRealPart(xg[n - 1]);
186: MPI_Bcast(&xmin, 1, MPIU_REAL, 0, comm);
187: MPI_Bcast(&xmax, 1, MPIU_REAL, size - 1, comm);
189: DMDASelectFields(da, &ndisplayfields, &displayfields);
190: PetscViewerGetFormat(v, &format);
191: PetscOptionsGetBool(NULL, NULL, "-draw_ports", &useports, NULL);
192: if (format == PETSC_VIEWER_DRAW_PORTS) useports = PETSC_TRUE;
193: if (useports) {
194: PetscViewerDrawGetDraw(v, 0, &draw);
195: PetscViewerDrawGetDrawAxis(v, 0, &axis);
196: PetscDrawCheckResizedWindow(draw);
197: PetscDrawClear(draw);
198: PetscDrawViewPortsCreate(draw, ndisplayfields, &ports);
199: }
201: /* Loop over each field; drawing each in a different window */
202: for (k = 0; k < ndisplayfields; k++) {
203: j = displayfields[k];
205: /* determine the min and max value in plot */
206: VecStrideMin(xin, j, NULL, &min);
207: VecStrideMax(xin, j, NULL, &max);
208: if (j < nbounds) {
209: min = PetscMin(min, bounds[2 * j]);
210: max = PetscMax(max, bounds[2 * j + 1]);
211: }
212: if (min == max) {
213: min -= 1.e-5;
214: max += 1.e-5;
215: }
217: if (useports) {
218: PetscDrawViewPortsSet(ports, k);
219: DMDAGetFieldName(da, j, &tlabel);
220: } else {
221: const char *title;
222: PetscViewerDrawGetHold(v, &hold);
223: PetscViewerDrawGetDraw(v, k, &draw);
224: PetscViewerDrawGetDrawAxis(v, k, &axis);
225: DMDAGetFieldName(da, j, &title);
226: if (title) PetscDrawSetTitle(draw, title);
227: PetscDrawCheckResizedWindow(draw);
228: if (!hold) PetscDrawClear(draw);
229: }
230: PetscDrawAxisSetLabels(axis, tlabel, xlabel, NULL);
231: PetscDrawAxisSetLimits(axis, xmin, xmax, min, max);
232: PetscDrawAxisDraw(axis);
234: /* draw local part of vector */
235: PetscObjectGetNewTag((PetscObject)xin, &tag);
236: if (rank < size - 1) { /*send value to right */
237: MPI_Send((void *)&xg[n - 1], 1, MPIU_REAL, rank + 1, tag, comm);
238: MPI_Send((void *)&array[j + (n - 1) * dof], 1, MPIU_REAL, rank + 1, tag, comm);
239: }
240: if (rank) { /* receive value from left */
241: MPI_Recv(&xgtmp, 1, MPIU_REAL, rank - 1, tag, comm, &status);
242: MPI_Recv(&tmp, 1, MPIU_REAL, rank - 1, tag, comm, &status);
243: }
244: PetscDrawCollectiveBegin(draw);
245: if (rank) {
246: PetscDrawLine(draw, xgtmp, tmp, PetscRealPart(xg[0]), PetscRealPart(array[j]), PETSC_DRAW_RED);
247: if (showmarkers) PetscDrawPoint(draw, xgtmp, tmp, PETSC_DRAW_BLACK);
248: }
249: for (i = 1; i < n; i++) {
250: PetscDrawLine(draw, PetscRealPart(xg[i - 1]), PetscRealPart(array[j + dof * (i - 1)]), PetscRealPart(xg[i]), PetscRealPart(array[j + dof * i]), PETSC_DRAW_RED);
251: if (showmarkers) PetscDrawMarker(draw, PetscRealPart(xg[i - 1]), PetscRealPart(array[j + dof * (i - 1)]), PETSC_DRAW_BLACK);
252: }
253: if (rank == size - 1) {
254: if (showmarkers) PetscDrawMarker(draw, PetscRealPart(xg[n - 1]), PetscRealPart(array[j + dof * (n - 1)]), PETSC_DRAW_BLACK);
255: }
256: PetscDrawCollectiveEnd(draw);
257: PetscDrawFlush(draw);
258: PetscDrawPause(draw);
259: if (!useports) PetscDrawSave(draw);
260: }
261: if (useports) {
262: PetscViewerDrawGetDraw(v, 0, &draw);
263: PetscDrawSave(draw);
264: }
266: PetscDrawViewPortsDestroy(ports);
267: PetscFree(displayfields);
268: VecRestoreArrayRead(xcoor, &xg);
269: VecRestoreArrayRead(xin, &array);
270: return 0;
271: }