Actual source code: dtri.c
1: /*$Id: dtri.c,v 1.49 2001/03/23 23:20:08 balay Exp $*/
2: /*
3: Provides the calling sequences for all the basic PetscDraw routines.
4: */
5: #include src/sys/src/draw/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: @*/
24: int PetscDrawTriangle(PetscDraw draw,PetscReal x1,PetscReal y_1,PetscReal x2,PetscReal y2,PetscReal x3,PetscReal y3,
25: int c1,int c2,int c3)
26: {
27: int ierr;
28: PetscTruth isnull;
32: PetscTypeCompare((PetscObject)draw,PETSC_DRAW_NULL,&isnull);
33: if (isnull) return(0);
34: (*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
35: return(0);
36: }
39: /*@
40: PetscDrawScalePopup - PetscDraws a contour scale window.
42: Collective on PetscDraw
44: Input Parameters:
45: + popup - the window (often a window obtained via PetscDrawGetPopup()
46: . min - minimum value being plotted
47: - max - maximum value being plotted
49: Level: intermediate
51: Notes:
52: All processors that share the draw MUST call this routine
54: @*/
55: int PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max)
56: {
57: PetscReal xl = 0.0,yl = 0.0,xr = 1.0,yr = 1.0,value;
58: int i,c = PETSC_DRAW_BASIC_COLORS,rank,ierr;
59: char string[32];
60: MPI_Comm comm;
63: PetscDrawCheckResizedWindow(popup);
64: PetscObjectGetComm((PetscObject)popup,&comm);
65: MPI_Comm_rank(comm,&rank);
66: if (rank) return(0);
68: for (i=0; i<10; i++) {
69: PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);
70: yl += .1; yr += .1; c = (int)((double)c + (245. - PETSC_DRAW_BASIC_COLORS)/9.);
71: }
72: for (i=0; i<10; i++) {
73: value = min + i*(max-min)/9.0;
74: /* look for a value that should be zero, but is not due to round-off */
75: if (PetscAbsDouble(value) < 1.e-10 && max-min > 1.e-6) value = 0.0;
76: sprintf(string,"%g",value);
77: PetscDrawString(popup,.2,.02 + i/10.0,PETSC_DRAW_BLACK,string);
78: }
79: PetscDrawSetTitle(popup,"Contour Scale");
80: PetscDrawFlush(popup);
81: return(0);
82: }
84: typedef struct {
85: int m,n;
86: PetscReal *x,*y,min,max;
87: Scalar *v;
88: PetscTruth showgrid;
89: } ZoomCtx;
91: static int PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx)
92: {
93: int i,ierr;
94: ZoomCtx *ctx = (ZoomCtx*)dctx;
97: PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->max,ctx->min,ctx->v);
98: if (ctx->showgrid) {
99: for (i=0; i<ctx->m; i++) {
100: PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);
101: }
102: for (i=0; i<ctx->n; i++) {
103: PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);
104: }
105: }
106: return(0);
107: }
109: /*@C
110: PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array
111: that is stored as a PETSc vector.
113: Collective on PetscDraw, but PetscDraw must be sequential
115: Input Parameters:
116: + win - the window to draw in
117: . m,n - the global number of mesh points in the x and y directions
118: . xi,yi - the locations of the global mesh points (optional, use PETSC_NULL
119: to indicate uniform spacing on [0,1])
120: - V - the values
122: Options Database Keys:
123: + -draw_x_shared_colormap - Indicates use of private colormap
124: - -draw_contour_grid - PetscDraws grid contour
126: Level: intermediate
128: Concepts: contour plot
129: Concepts: drawing^contour plot
131: .seealso: PetscDrawTensorContourPatch()
133: @*/
134: int PetscDrawTensorContour(PetscDraw win,int m,int n,const PetscReal xi[],const PetscReal yi[],Scalar *v)
135: {
136: int N = m*n,ierr;
137: PetscTruth isnull;
138: PetscDraw popup;
139: MPI_Comm comm;
140: int xin=1,yin=1,i,size;
141: PetscReal h;
142: ZoomCtx ctx;
145: PetscDrawIsNull(win,&isnull); if (isnull) return(0);
146: PetscObjectGetComm((PetscObject)win,&comm);
147: MPI_Comm_size(comm,&size);
148: if (size > 1) SETERRQ(1,"May only be used with single processor PetscDraw");
150: if (N <= 0) {
151: SETERRQ2(1,"n %d and m %d must be positive",m,n);
152: }
154: /* create scale window */
155: PetscDrawGetPopup(win,&popup);
156: PetscDrawCheckResizedWindow(win);
158: ctx.v = v;
159: ctx.m = m;
160: ctx.n = n;
161: ctx.max = ctx.min = PetscRealPart(v[0]);
162: for (i=0; i<N; i++) {
163: if (ctx.max < PetscRealPart(ctx.v[i])) ctx.max = PetscRealPart(ctx.v[i]);
164: if (ctx.min > PetscRealPart(ctx.v[i])) ctx.min = PetscRealPart(ctx.v[i]);
165: }
166: if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;}
168: /* PetscDraw the scale window */
169: if (popup) {PetscDrawScalePopup(popup,ctx.min,ctx.max);}
171: PetscOptionsHasName(PETSC_NULL,"-draw_contour_grid",&ctx.showgrid);
173: /* fill up x and y coordinates */
174: if (!xi) {
175: xin = 0;
176: ierr = PetscMalloc(ctx.m*sizeof(PetscReal),&ctx.x);
177: h = 1.0/(ctx.m-1);
178: ctx.x[0] = 0.0;
179: for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h;
180: } else {
181: ctx.x = (PetscReal*)xi;
182: }
183: if (!yi) {
184: yin = 0;
185: ierr = PetscMalloc(ctx.n*sizeof(PetscReal),&ctx.y);
186: h = 1.0/(ctx.n-1);
187: ctx.y[0] = 0.0;
188: for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h;
189: } else {
190: ctx.y = (PetscReal *)yi;
191: }
193: PetscDrawZoom(win,(int (*)(PetscDraw,void *))PetscDrawTensorContour_Zoom,&ctx);
194:
195: if (!xin) {PetscFree(ctx.x);}
196: if (!yin) {PetscFree(ctx.y);}
198: return(0);
199: }
201: /*@
202: PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot
203: for a two-dimensional array.
205: Not Collective
207: Input Parameters:
208: + win - the window to draw in
209: . m,n - the number of local mesh points in the x and y direction
210: . x,y - the locations of the local mesh points
211: . max,min - the maximum and minimum value in the entire contour
212: - v - the data
214: Options Database Keys:
215: . -draw_x_shared_colormap - Activates private colormap
217: Level: advanced
219: Note:
220: This is a lower level support routine, usually the user will call
221: PetscDrawTensorContour().
223: Concepts: contour plot
225: .seealso: PetscDrawTensorContour()
227: @*/
228: int PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal max,PetscReal min,Scalar *v)
229: {
230: int c1,c2,c3,c4,i,j,ierr;
231: PetscReal x1,x2,x3,x4,y_1,y2,y3,y4,scale;
234: scale = (245.0 - PETSC_DRAW_BASIC_COLORS)/(max - min);
236: /* PetscDraw the contour plot patch */
237: for (j=0; j<n-1; j++) {
238: for (i=0; i<m-1; i++) {
239: #if !defined(PETSC_USE_COMPLEX)
240: x1 = x[i]; y_1 = y[j]; c1 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m] - min));
241: x2 = x[i+1];y2 = y_1; c2 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1]-min));
242: x3 = x2; y3 = y[j+1];c3 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1+m]-min));
243: x4 = x1; y4 = y3; c4 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+m]-min));
244: #else
245: x1 = x[i]; y_1 = y[j]; c1 = (int)(PETSC_DRAW_BASIC_COLORS + scale*PetscRealPart(v[i+j*m]-min));
246: x2 = x[i+1];y2 = y_1; c2 = (int)(PETSC_DRAW_BASIC_COLORS + scale*PetscRealPart(v[i+j*m+1]-min));
247: x3 = x2; y3 = y[j+1];c3 = (int)(PETSC_DRAW_BASIC_COLORS + scale*PetscRealPart(v[i+j*m+1+m]-min));
248: x4 = x1; y4 = y3; c4 = (int)(PETSC_DRAW_BASIC_COLORS + scale*PetscRealPart(v[i+j*m+m]-min));
249: #endif
250: PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
251: PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);
252: }
253: }
255: return(0);
256: }