Actual source code: dtri.c
petsc-3.6.4 2016-04-12
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: if (!draw->ops->triangle) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"No triangles with this PetscDrawType");
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: PetscDrawSynchronizedClear(popup);
70: PetscObjectGetComm((PetscObject)popup,&comm);
71: MPI_Comm_rank(comm,&rank);
72: if (rank) return(0);
74: for (i=0; i<10; i++) {
75: PetscDrawRectangle(popup,xl,yl,xr,yr,c,c,c,c);
77: yl += .1; yr += .1;
78: c = (int)((double)c + (245. - PETSC_DRAW_BASIC_COLORS)/9.);
79: }
80: for (i=0; i<10; i++) {
81: value = min + i*(max-min)/9.0;
82: /* look for a value that should be zero, but is not due to round-off */
83: if (PetscAbsReal(value) < 1.e-10 && max-min > 1.e-6) value = 0.0;
84: sprintf(string,"%18.16e",(double)value);
85: PetscDrawString(popup,.2,.02 + i/10.0,PETSC_DRAW_BLACK,string);
86: }
87: PetscDrawSetTitle(popup,"Contour Scale");
88: PetscDrawFlush(popup);
89: return(0);
90: }
92: typedef struct {
93: int m,n;
94: PetscReal *x,*y,min,max,*v;
95: PetscBool showgrid;
96: } ZoomCtx;
100: static PetscErrorCode PetscDrawTensorContour_Zoom(PetscDraw win,void *dctx)
101: {
103: int i;
104: ZoomCtx *ctx = (ZoomCtx*)dctx;
107: PetscDrawTensorContourPatch(win,ctx->m,ctx->n,ctx->x,ctx->y,ctx->max,ctx->min,ctx->v);
108: if (ctx->showgrid) {
109: for (i=0; i<ctx->m; i++) {
110: PetscDrawLine(win,ctx->x[i],ctx->y[0],ctx->x[i],ctx->y[ctx->n-1],PETSC_DRAW_BLACK);
111: }
112: for (i=0; i<ctx->n; i++) {
113: PetscDrawLine(win,ctx->x[0],ctx->y[i],ctx->x[ctx->m-1],ctx->y[i],PETSC_DRAW_BLACK);
114: }
115: }
116: return(0);
117: }
121: /*@C
122: PetscDrawTensorContour - PetscDraws a contour plot for a two-dimensional array
123: that is stored as a PETSc vector.
125: Collective on PetscDraw, but PetscDraw must be sequential
127: Input Parameters:
128: + win - the window to draw in
129: . m,n - the global number of mesh points in the x and y directions
130: . xi,yi - the locations of the global mesh points (optional, use NULL
131: to indicate uniform spacing on [0,1])
132: - V - the values
134: Options Database Keys:
135: + -draw_x_shared_colormap - Indicates use of private colormap
136: - -draw_contour_grid - PetscDraws grid contour
138: Level: intermediate
140: Concepts: contour plot
141: Concepts: drawing^contour plot
143: .seealso: PetscDrawTensorContourPatch()
145: @*/
146: PetscErrorCode PetscDrawTensorContour(PetscDraw win,int m,int n,const PetscReal xi[],const PetscReal yi[],PetscReal *v)
147: {
149: int N = m*n;
150: PetscBool isnull;
151: PetscDraw popup;
152: MPI_Comm comm;
153: int xin=1,yin=1,i;
154: PetscMPIInt size;
155: PetscReal h;
156: ZoomCtx ctx;
159: PetscDrawIsNull(win,&isnull); if (isnull) return(0);
160: PetscObjectGetComm((PetscObject)win,&comm);
161: MPI_Comm_size(comm,&size);
162: if (size > 1) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONG,"May only be used with single processor PetscDraw");
163: if (N <= 0) SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"n %d and m %d must be positive",m,n);
165: /* create scale window */
166: PetscDrawGetPopup(win,&popup);
167: PetscDrawCheckResizedWindow(win);
169: ctx.v = v;
170: ctx.m = m;
171: ctx.n = n;
172: ctx.max = ctx.min = v[0];
173: for (i=0; i<N; i++) {
174: if (ctx.max < ctx.v[i]) ctx.max = ctx.v[i];
175: if (ctx.min > ctx.v[i]) ctx.min = ctx.v[i];
176: }
177: if (ctx.max - ctx.min < 1.e-7) {ctx.min -= 5.e-8; ctx.max += 5.e-8;}
179: /* PetscDraw the scale window */
180: if (popup) {PetscDrawScalePopup(popup,ctx.min,ctx.max);}
182: ctx.showgrid = PETSC_FALSE;
183: PetscOptionsGetBool(NULL,"-draw_contour_grid",&ctx.showgrid,NULL);
185: /* fill up x and y coordinates */
186: if (!xi) {
187: xin = 0;
188: PetscMalloc1(ctx.m,&ctx.x);
189: h = 1.0/(ctx.m-1);
190: ctx.x[0] = 0.0;
191: for (i=1; i<ctx.m; i++) ctx.x[i] = ctx.x[i-1] + h;
192: } else ctx.x = (PetscReal*)xi;
194: if (!yi) {
195: yin = 0;
196: PetscMalloc1(ctx.n,&ctx.y);
197: h = 1.0/(ctx.n-1);
198: ctx.y[0] = 0.0;
199: for (i=1; i<ctx.n; i++) ctx.y[i] = ctx.y[i-1] + h;
200: } else ctx.y = (PetscReal*)yi;
202: PetscDrawZoom(win,(PetscErrorCode (*)(PetscDraw,void*))PetscDrawTensorContour_Zoom,&ctx);
204: if (!xin) {PetscFree(ctx.x);}
205: if (!yin) {PetscFree(ctx.y);}
206: return(0);
207: }
211: /*@
212: PetscDrawTensorContourPatch - PetscDraws a rectangular patch of a contour plot
213: for a two-dimensional array.
215: Not Collective
217: Input Parameters:
218: + win - the window to draw in
219: . m,n - the number of local mesh points in the x and y direction
220: . x,y - the locations of the local mesh points
221: . max,min - the maximum and minimum value in the entire contour
222: - v - the data
224: Options Database Keys:
225: . -draw_x_shared_colormap - Activates private colormap
227: Level: advanced
229: Note:
230: This is a lower level support routine, usually the user will call
231: PetscDrawTensorContour().
233: Concepts: contour plot
235: .seealso: PetscDrawTensorContour()
237: @*/
238: PetscErrorCode PetscDrawTensorContourPatch(PetscDraw draw,int m,int n,PetscReal *x,PetscReal *y,PetscReal max,PetscReal min,PetscReal *v)
239: {
241: int c1,c2,c3,c4,i,j;
242: PetscReal x1,x2,x3,x4,y_1,y2,y3,y4,scale;
245: scale = (245.0 - PETSC_DRAW_BASIC_COLORS)/(max - min);
247: /* PetscDraw the contour plot patch */
248: for (j=0; j<n-1; j++) {
249: for (i=0; i<m-1; i++) {
250: x1 = x[i]; y_1 = y[j]; c1 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m] - min));
251: x2 = x[i+1];y2 = y_1; c2 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1]-min));
252: x3 = x2; y3 = y[j+1];c3 = (int)(PETSC_DRAW_BASIC_COLORS + scale*(v[i+j*m+1+m]-min));
253: 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: }
259: return(0);
260: }