Actual source code: dtri.c
petsc-3.4.5 2014-06-29
2: /*
3: Provides the calling sequences for all the basic PetscDraw routines.
4: */
5: #include <petsc-private/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,int c1,int c2,int c3)
27: {
29: PetscBool isnull;
33: PetscObjectTypeCompare((PetscObject)draw,PETSC_DRAW_NULL,&isnull);
34: if (isnull) return(0);
35: (*draw->ops->triangle)(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
36: return(0);
37: }
42: /*@
43: PetscDrawScalePopup - PetscDraws a contour scale window.
45: Collective on PetscDraw
47: Input Parameters:
48: + popup - the window (often a window obtained via PetscDrawGetPopup()
49: . min - minimum value being plotted
50: - max - maximum value being plotted
52: Level: intermediate
54: Notes:
55: All processors that share the draw MUST call this routine
57: @*/
58: PetscErrorCode PetscDrawScalePopup(PetscDraw popup,PetscReal min,PetscReal max)
59: {
60: PetscReal xl = 0.0,yl = 0.0,xr = 2.0,yr = 1.0,value;
62: int i,c = PETSC_DRAW_BASIC_COLORS,rank;
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);
75: yl += .1; yr += .1;
76: c = (int)((double)c + (245. - PETSC_DRAW_BASIC_COLORS)/9.);
77: }
78: for (i=0; i<10; i++) {
79: value = min + i*(max-min)/9.0;
80: /* look for a value that should be zero, but is not due to round-off */
81: if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0;
82: sprintf(string,"%18.16e",(double)value);
83: PetscDrawString(popup,.2,.02 + i/10.0,PETSC_DRAW_BLACK,string);
84: }
85: PetscDrawSetTitle(popup,"Contour Scale");
86: PetscDrawFlush(popup);
87: return(0);
88: }
90: typedef struct {
91: int m,n;
92: PetscReal *x,*y,min,max,*v;
93: PetscBool showgrid;
94: } ZoomCtx;
98: static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx)
99: {
101: int i;
102: ZoomCtx *ctx = (ZoomCtx*)dctx;
105: PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->max,ctx->min,ctx->v);
106: if (ctx->showgrid) {
107: for (i=0; i<ctx->m; i++) {
108: PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);
109: }
110: for (i=0; i<ctx->n; i++) {
111: PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);
112: }
113: }
114: return(0);
115: }
119: /*@C
120: PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array
121: that is stored as a PETSc vector.
123: Collective on PetscDraw, but PetscDraw must be sequential
125: Input Parameters:
126: + win - the window to draw in
127: . m,n - the global number of mesh points in the x and y directions
128: . xi,yi - the locations of the global mesh points (optional, use NULL
129: to indicate uniform spacing on [0,1])
130: - V - the values
132: Options Database Keys:
133: + -draw_x_shared_colormap - Indicates use of private colormap
134: - -draw_contour_grid - PetscDraws grid contour
136: Level: intermediate
138: Concepts: contour plot
139: Concepts: drawing^contour plot
141: .seealso: PetscDrawTensorContourPatch()
143: @*/
144: PetscErrorCode PetscDrawTensorContour(PetscDraw win,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v)
145: {
147: int N = m*n;
148: PetscBool isnull;
149: PetscDraw popup;
150: MPI_Comm comm;
151: int xin=1,yin=1,i;
152: PetscMPIInt size;
153: PetscReal h;
154: ZoomCtx ctx;
157: PetscDrawIsNull(win,&isnull); if (isnull) return(0);
158: PetscObjectGetComm((PetscObject)win,&comm);
159: MPI_Comm_size(comm,&size);
160: if (size > 1) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"May only be used with single processor PetscDraw");
161: if (N <= 0) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"n %d and m %d must be positive",m,n);
163: /* create scale window */
164: PetscDrawGetPopup(win,&popup);
165: PetscDrawCheckResizedWindow(win);
167: ctx.v = v;
168: ctx.m = m;
169: ctx.n = n;
170: ctx.max = ctx.min = v[0];
171: for (i=0; i<N; i++) {
172: if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i];
173: if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i];
174: }
175: if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;}
177: /* PetscDraw the scale window */
178: if (popup) {PetscDrawScalePopup(popup,ctx.min,ctx.max);}
180: ctx.showgrid = PETSC_FALSE;
181: PetscOptionsGetBool(NULL,"-draw_contour_grid",&ctx.showgrid,NULL);
183: /* fill up x and y coordinates */
184: if (!xi) {
185: xin = 0;
186: PetscMalloc(ctx.m*sizeof(PetscReal),&ctx.x);
187: h = 1.0/(ctx.m-1);
188: ctx.x[0] = 0.0;
189: for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h;
190: } else ctx.x = (PetscReal*)xi;
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 ctx.y = (PetscReal*)yi;
200: PetscDrawZoom(win,(PetscErrorCode (*)(PetscDraw,void*))PetscDrawTensorContour_Zoom,&ctx);
202: if (!xin) {PetscFree(ctx.x);}
203: if (!yin) {PetscFree(ctx.y);}
204: return(0);
205: }
209: /*@
210: PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot
211: for a two-dimensional array.
213: Not Collective
215: Input Parameters:
216: + win - the window to draw in
217: . m,n - the number of local mesh points in the x and y direction
218: . x,y - the locations of the local mesh points
219: . max,min - the maximum and minimum value in the entire contour
220: - v - the data
222: Options Database Keys:
223: . -draw_x_shared_colormap - Activates private colormap
225: Level: advanced
227: Note:
228: This is a lower level support routine, usually the user will call
229: PetscDrawTensorContour().
231: Concepts: contour plot
233: .seealso: PetscDrawTensorContour()
235: @*/
236: PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal max,PetscReal min,PetscReal *v)
237: {
239: int c1,c2,c3,c4,i,j;
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));
253: PetscDrawTriangle(draw,x1,y_1,x2,y2,x3,y3,c1,c2,c3);
254: PetscDrawTriangle(draw,x1,y_1,x3,y3,x4,y4,c1,c3,c4);
255: }
256: }
257: return(0);
258: }