Actual source code: dtri.c
petsc-3.3-p7 2013-05-11
2: /*
3: Provides the calling sequences for all the basic PetscDraw routines.
4: */
5: #include <../src/sys/draw/drawimpl.h> /*I "petscdraw.h" I*/
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: PetscErrorCode PetscDrawTriangle(PetscDraw draw,PetscReal x1,PetscReal y_1,PetscReal x2,PetscReal y2,PetscReal x3,PetscReal y3,
27: int c1,int c2,int c3)
28: {
30: PetscBool isnull;
34: PetscObjectTypeCompare((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: }
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: PetscErrorCode PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max)
60: {
61: PetscReal xl = 0.0,yl = 0.0,xr = 2.0,yr = 1.0,value;
63: int i,c = PETSC_DRAW_BASIC_COLORS,rank;
64: char string[32];
65: MPI_Comm comm;
68: PetscDrawCheckResizedWindow(popup);
69: PetscObjectGetComm((PetscObject)popup,&comm);
70: MPI_Comm_rank(comm,&rank);
71: if (rank) return(0);
73: for (i=0; i<10; i++) {
74: PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);
75: yl += .1; yr += .1; c = (int)((double)c + (245. - PETSC_DRAW_BASIC_COLORS)/9.);
76: }
77: for (i=0; i<10; i++) {
78: value = min + i*(max-min)/9.0;
79: /* look for a value that should be zero, but is not due to round-off */
80: if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0;
81: sprintf(string,"%18.16e",(double)value);
82: PetscDrawString(popup,.2,.02 + i/10.0,PETSC_DRAW_BLACK,string);
83: }
84: PetscDrawSetTitle(popup,"Contour Scale");
85: PetscDrawFlush(popup);
86: return(0);
87: }
89: typedef struct {
90: int m,n;
91: PetscReal *x,*y,min,max,*v;
92: PetscBool showgrid;
93: } ZoomCtx;
97: static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx)
98: {
100: int i;
101: ZoomCtx *ctx = (ZoomCtx*)dctx;
104: PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->max,ctx->min,ctx->v);
105: if (ctx->showgrid) {
106: for (i=0; i<ctx->m; i++) {
107: PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);
108: }
109: for (i=0; i<ctx->n; i++) {
110: PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);
111: }
112: }
113: return(0);
114: }
118: /*@C
119: PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array
120: that is stored as a PETSc vector.
122: Collective on PetscDraw, but PetscDraw must be sequential
124: Input Parameters:
125: + win - the window to draw in
126: . m,n - the global number of mesh points in the x and y directions
127: . xi,yi - the locations of the global mesh points (optional, use PETSC_NULL
128: to indicate uniform spacing on [0,1])
129: - V - the values
131: Options Database Keys:
132: + -draw_x_shared_colormap - Indicates use of private colormap
133: - -draw_contour_grid - PetscDraws grid contour
135: Level: intermediate
137: Concepts: contour plot
138: Concepts: drawing^contour plot
140: .seealso: PetscDrawTensorContourPatch()
142: @*/
143: PetscErrorCode PetscDrawTensorContour(PetscDraw win,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v)
144: {
146: int N = m*n;
147: PetscBool isnull;
148: PetscDraw popup;
149: MPI_Comm comm;
150: int xin=1,yin=1,i;
151: PetscMPIInt size;
152: PetscReal h;
153: ZoomCtx ctx;
156: PetscDrawIsNull(win,&isnull); if (isnull) return(0);
157: PetscObjectGetComm((PetscObject)win,&comm);
158: MPI_Comm_size(comm,&size);
159: if (size > 1) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"May only be used with single processor PetscDraw");
160: if (N <= 0) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"n %d and m %d must be positive",m,n);
162: /* create scale window */
163: PetscDrawGetPopup(win,&popup);
164: PetscDrawCheckResizedWindow(win);
166: ctx.v = v;
167: ctx.m = m;
168: ctx.n = n;
169: ctx.max = ctx.min = v[0];
170: for (i=0; i<N; i++) {
171: if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i];
172: if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i];
173: }
174: if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;}
176: /* PetscDraw the scale window */
177: if (popup) {PetscDrawScalePopup(popup,ctx.min,ctx.max);}
179: ctx.showgrid = PETSC_FALSE;
180: PetscOptionsGetBool(PETSC_NULL,"-draw_contour_grid",&ctx.showgrid,PETSC_NULL);
182: /* fill up x and y coordinates */
183: if (!xi) {
184: xin = 0;
185: PetscMalloc(ctx.m*sizeof(PetscReal),&ctx.x);
186: h = 1.0/(ctx.m-1);
187: ctx.x[0] = 0.0;
188: for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h;
189: } else {
190: ctx.x = (PetscReal*)xi;
191: }
192: if (!yi) {
193: yin = 0;
194: PetscMalloc(ctx.n*sizeof(PetscReal),&ctx.y);
195: h = 1.0/(ctx.n-1);
196: ctx.y[0] = 0.0;
197: for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h;
198: } else {
199: ctx.y = (PetscReal *)yi;
200: }
202: PetscDrawZoom(win,(PetscErrorCode (*)(PetscDraw,void *))PetscDrawTensorContour_Zoom,&ctx);
203:
204: if (!xin) {PetscFree(ctx.x);}
205: if (!yin) {PetscFree(ctx.y);}
207: return(0);
208: }
212: /*@
213: PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot
214: for a two-dimensional array.
216: Not Collective
218: Input Parameters:
219: + win - the window to draw in
220: . m,n - the number of local mesh points in the x and y direction
221: . x,y - the locations of the local mesh points
222: . max,min - the maximum and minimum value in the entire contour
223: - v - the data
225: Options Database Keys:
226: . -draw_x_shared_colormap - Activates private colormap
228: Level: advanced
230: Note:
231: This is a lower level support routine, usually the user will call
232: PetscDrawTensorContour().
234: Concepts: contour plot
236: .seealso: PetscDrawTensorContour()
238: @*/
239: PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal max,PetscReal min,PetscReal *v)
240: {
242: int c1,c2,c3,c4,i,j;
243: PetscReal x1,x2,x3,x4,y_1,y2,y3,y4,scale;
246: scale = (245.0 - PETSC_DRAW_BASIC_COLORS)/(max - min);
248: /* PetscDraw the contour plot patch */
249: for (j=0; j<n-1; j++) {
250: for (i=0; i<m-1; i++) {
251: x1 = x[i]; y_1 = y[j]; c1 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m] - min));
252: x2 = x[i+1];y2 = y_1; c2 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1]-min));
253: x3 = x2; y3 = y[j+1];c3 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1+m]-min));
254: x4 = x1; y4 = y3; c4 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+m]-min));
255: PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
256: PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);
257: }
258: }
260: return(0);
261: }