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: /*@
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 (PetscAbsReal(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,*v;
87: PetscTruth showgrid;
88: } ZoomCtx;
90: static int PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx)
91: {
92: int i,ierr;
93: ZoomCtx *ctx = (ZoomCtx*)dctx;
96: PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->max,ctx->min,ctx->v);
97: if (ctx->showgrid) {
98: for (i=0; i<ctx->m; i++) {
99: PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);
100: }
101: for (i=0; i<ctx->n; i++) {
102: PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);
103: }
104: }
105: return(0);
106: }
108: /*@C
109: PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array
110: that is stored as a PETSc vector.
112: Collective on PetscDraw, but PetscDraw must be sequential
114: Input Parameters:
115: + win - the window to draw in
116: . m,n - the global number of mesh points in the x and y directions
117: . xi,yi - the locations of the global mesh points (optional, use PETSC_NULL
118: to indicate uniform spacing on [0,1])
119: - V - the values
121: Options Database Keys:
122: + -draw_x_shared_colormap - Indicates use of private colormap
123: - -draw_contour_grid - PetscDraws grid contour
125: Level: intermediate
127: Concepts: contour plot
128: Concepts: drawing^contour plot
130: .seealso: PetscDrawTensorContourPatch()
132: @*/
133: int PetscDrawTensorContour(PetscDraw win,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v)
134: {
135: int N = m*n,ierr;
136: PetscTruth isnull;
137: PetscDraw popup;
138: MPI_Comm comm;
139: int xin=1,yin=1,i,size;
140: PetscReal h;
141: ZoomCtx ctx;
144: PetscDrawIsNull(win,&isnull); if (isnull) return(0);
145: PetscObjectGetComm((PetscObject)win,&comm);
146: MPI_Comm_size(comm,&size);
147: if (size > 1) SETERRQ(1,"May only be used with single processor PetscDraw");
149: if (N <= 0) {
150: SETERRQ2(1,"n %d and m %d must be positive",m,n);
151: }
153: /* create scale window */
154: PetscDrawGetPopup(win,&popup);
155: PetscDrawCheckResizedWindow(win);
157: ctx.v = v;
158: ctx.m = m;
159: ctx.n = n;
160: ctx.max = ctx.min = v[0];
161: for (i=0; i<N; i++) {
162: if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i];
163: if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i];
164: }
165: if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;}
167: /* PetscDraw the scale window */
168: if (popup) {PetscDrawScalePopup(popup,ctx.min,ctx.max);}
170: PetscOptionsHasName(PETSC_NULL,"-draw_contour_grid",&ctx.showgrid);
172: /* fill up x and y coordinates */
173: if (!xi) {
174: xin = 0;
175: ierr = PetscMalloc(ctx.m*sizeof(PetscReal),&ctx.x);
176: h = 1.0/(ctx.m-1);
177: ctx.x[0] = 0.0;
178: for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h;
179: } else {
180: ctx.x = (PetscReal*)xi;
181: }
182: if (!yi) {
183: yin = 0;
184: ierr = PetscMalloc(ctx.n*sizeof(PetscReal),&ctx.y);
185: h = 1.0/(ctx.n-1);
186: ctx.y[0] = 0.0;
187: for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h;
188: } else {
189: ctx.y = (PetscReal *)yi;
190: }
192: PetscDrawZoom(win,(int (*)(PetscDraw,void *))PetscDrawTensorContour_Zoom,&ctx);
193:
194: if (!xin) {PetscFree(ctx.x);}
195: if (!yin) {PetscFree(ctx.y);}
197: return(0);
198: }
200: /*@
201: PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot
202: for a two-dimensional array.
204: Not Collective
206: Input Parameters:
207: + win - the window to draw in
208: . m,n - the number of local mesh points in the x and y direction
209: . x,y - the locations of the local mesh points
210: . max,min - the maximum and minimum value in the entire contour
211: - v - the data
213: Options Database Keys:
214: . -draw_x_shared_colormap - Activates private colormap
216: Level: advanced
218: Note:
219: This is a lower level support routine, usually the user will call
220: PetscDrawTensorContour().
222: Concepts: contour plot
224: .seealso: PetscDrawTensorContour()
226: @*/
227: int PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal max,PetscReal min,PetscReal *v)
228: {
229: int c1,c2,c3,c4,i,j,ierr;
230: PetscReal x1,x2,x3,x4,y_1,y2,y3,y4,scale;
233: scale = (245.0 - PETSC_DRAW_BASIC_COLORS)/(max - min);
235: /* PetscDraw the contour plot patch */
236: for (j=0; j<n-1; j++) {
237: for (i=0; i<m-1; i++) {
238: x1 = x[i]; y_1 = y[j]; c1 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m] - min));
239: x2 = x[i+1];y2 = y_1; c2 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1]-min));
240: x3 = x2; y3 = y[j+1];c3 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1+m]-min));
241: x4 = x1; y4 = y3; c4 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+m]-min));
242: PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
243: PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);
244: }
245: }
247: return(0);
248: }