Actual source code: dtri.c
1: /*$Id: dtri.c,v 1.53 2001/08/22 20:28:40 bsmith Exp $*/
2: /*
3: Provides the calling sequences for all the basic PetscDraw routines.
4: */
5: #include src/sys/src/draw/drawimpl.h
7: #undef __FUNCT__
9: /*@
10: PetscDrawTriangle - PetscDraws a triangle onto a drawable.
12: Not Collective
14: Input Parameters:
15: + draw - the drawing context
16: . x1,y1,x2,y2,x3,y3 - the coordinates of the vertices
17: - c1,c2,c3 - the colors of the three vertices in the same order as the xi,yi
19: Level: beginner
21: Concepts: drawing^triangle
22: Concepts: graphics^triangle
23: Concepts: triangle
25: @*/
26: int PetscDrawTriangle(PetscDraw draw,PetscReal x1,PetscReal y_1,PetscReal x2,PetscReal y2,PetscReal x3,PetscReal y3,
27: int c1,int c2,int c3)
28: {
29: int ierr;
30: PetscTruth isnull;
34: PetscTypeCompare((PetscObject)draw,PETSC_DRAW_NULL,&isnull);
35: if (isnull) return(0);
36: (*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
37: return(0);
38: }
41: #undef __FUNCT__
43: /*@
44: PetscDrawScalePopup - PetscDraws a contour scale window.
46: Collective on PetscDraw
48: Input Parameters:
49: + popup - the window (often a window obtained via PetscDrawGetPopup()
50: . min - minimum value being plotted
51: - max - maximum value being plotted
53: Level: intermediate
55: Notes:
56: All processors that share the draw MUST call this routine
58: @*/
59: int PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max)
60: {
61: PetscReal xl = 0.0,yl = 0.0,xr = 1.0,yr = 1.0,value;
62: int i,c = PETSC_DRAW_BASIC_COLORS,rank,ierr;
63: char string[32];
64: MPI_Comm comm;
67: PetscDrawCheckResizedWindow(popup);
68: PetscObjectGetComm((PetscObject)popup,&comm);
69: MPI_Comm_rank(comm,&rank);
70: if (rank) return(0);
72: for (i=0; i<10; i++) {
73: PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);
74: yl += .1; yr += .1; c = (int)((double)c + (245. - PETSC_DRAW_BASIC_COLORS)/9.);
75: }
76: for (i=0; i<10; i++) {
77: value = min + i*(max-min)/9.0;
78: /* look for a value that should be zero, but is not due to round-off */
79: if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0;
80: sprintf(string,"%g",value);
81: PetscDrawString(popup,.2,.02 + i/10.0,PETSC_DRAW_BLACK,string);
82: }
83: PetscDrawSetTitle(popup,"Contour Scale");
84: PetscDrawFlush(popup);
85: return(0);
86: }
88: typedef struct {
89: int m,n;
90: PetscReal *x,*y,min,max,*v;
91: PetscTruth showgrid;
92: } ZoomCtx;
94: #undef __FUNCT__
96: static int PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx)
97: {
98: int i,ierr;
99: ZoomCtx *ctx = (ZoomCtx*)dctx;
102: PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->max,ctx->min,ctx->v);
103: if (ctx->showgrid) {
104: for (i=0; i<ctx->m; i++) {
105: PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);
106: }
107: for (i=0; i<ctx->n; i++) {
108: PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);
109: }
110: }
111: return(0);
112: }
114: #undef __FUNCT__
116: /*@C
117: PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array
118: that is stored as a PETSc vector.
120: Collective on PetscDraw, but PetscDraw must be sequential
122: Input Parameters:
123: + win - the window to draw in
124: . m,n - the global number of mesh points in the x and y directions
125: . xi,yi - the locations of the global mesh points (optional, use PETSC_NULL
126: to indicate uniform spacing on [0,1])
127: - V - the values
129: Options Database Keys:
130: + -draw_x_shared_colormap - Indicates use of private colormap
131: - -draw_contour_grid - PetscDraws grid contour
133: Level: intermediate
135: Concepts: contour plot
136: Concepts: drawing^contour plot
138: .seealso: PetscDrawTensorContourPatch()
140: @*/
141: int PetscDrawTensorContour(PetscDraw win,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v)
142: {
143: int N = m*n,ierr;
144: PetscTruth isnull;
145: PetscDraw popup;
146: MPI_Comm comm;
147: int xin=1,yin=1,i,size;
148: PetscReal h;
149: ZoomCtx ctx;
152: PetscDrawIsNull(win,&isnull); if (isnull) return(0);
153: PetscObjectGetComm((PetscObject)win,&comm);
154: MPI_Comm_size(comm,&size);
155: if (size > 1) SETERRQ(1,"May only be used with single processor PetscDraw");
157: if (N <= 0) {
158: SETERRQ2(1,"n %d and m %d must be positive",m,n);
159: }
161: /* create scale window */
162: PetscDrawGetPopup(win,&popup);
163: PetscDrawCheckResizedWindow(win);
165: ctx.v = v;
166: ctx.m = m;
167: ctx.n = n;
168: ctx.max = ctx.min = v[0];
169: for (i=0; i<N; i++) {
170: if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i];
171: if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i];
172: }
173: if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;}
175: /* PetscDraw the scale window */
176: if (popup) {PetscDrawScalePopup(popup,ctx.min,ctx.max);}
178: PetscOptionsHasName(PETSC_NULL,"-draw_contour_grid",&ctx.showgrid);
180: /* fill up x and y coordinates */
181: if (!xi) {
182: xin = 0;
183: ierr = PetscMalloc(ctx.m*sizeof(PetscReal),&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 {
188: ctx.x = (PetscReal*)xi;
189: }
190: if (!yi) {
191: yin = 0;
192: ierr = PetscMalloc(ctx.n*sizeof(PetscReal),&ctx.y);
193: h = 1.0/(ctx.n-1);
194: ctx.y[0] = 0.0;
195: for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h;
196: } else {
197: ctx.y = (PetscReal *)yi;
198: }
200: PetscDrawZoom(win,(int (*)(PetscDraw,void *))PetscDrawTensorContour_Zoom,&ctx);
201:
202: if (!xin) {PetscFree(ctx.x);}
203: if (!yin) {PetscFree(ctx.y);}
205: return(0);
206: }
208: #undef __FUNCT__
210: /*@
211: PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot
212: for a two-dimensional array.
214: Not Collective
216: Input Parameters:
217: + win - the window to draw in
218: . m,n - the number of local mesh points in the x and y direction
219: . x,y - the locations of the local mesh points
220: . max,min - the maximum and minimum value in the entire contour
221: - v - the data
223: Options Database Keys:
224: . -draw_x_shared_colormap - Activates private colormap
226: Level: advanced
228: Note:
229: This is a lower level support routine, usually the user will call
230: PetscDrawTensorContour().
232: Concepts: contour plot
234: .seealso: PetscDrawTensorContour()
236: @*/
237: int PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal max,PetscReal min,PetscReal *v)
238: {
239: int c1,c2,c3,c4,i,j,ierr;
240: PetscReal x1,x2,x3,x4,y_1,y2,y3,y4,scale;
243: scale = (245.0 - PETSC_DRAW_BASIC_COLORS)/(max - min);
245: /* PetscDraw the contour plot patch */
246: for (j=0; j<n-1; j++) {
247: for (i=0; i<m-1; i++) {
248: x1 = x[i]; y_1 = y[j]; c1 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m] - min));
249: x2 = x[i+1];y2 = y_1; c2 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1]-min));
250: x3 = x2; y3 = y[j+1];c3 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1+m]-min));
251: x4 = x1; y4 = y3; c4 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+m]-min));
252: PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
253: PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);
254: }
255: }
257: return(0);
258: }