axesbox.c

su 的源代码库

	/* draw horizontal axis */
	if (style==NORMAL) {
		amin = (x1beg<x1end)?x1beg:x1end;
		amax = (x1beg>x1end)?x1beg:x1end;
		dnum = d1num;  fnum = f1num;  ntic = n1tic;
		scale = width/(x1end+p1end-x1beg-p1beg);
		base = x-scale*(x1beg+p1beg);
		ya = y+height;
		ticb = ticsize;
		numb = ticb+labelca;
		labelb = numb+labelch;
		grid = grid1;
		label = label1;
	} else {
		amin = (x2beg<x2end)?x2beg:x2end;
		amax = (x2beg>x2end)?x2beg:x2end;
		dnum = d2num;  fnum = f2num;  ntic = n2tic;
		scale = width/(x2end+p2end-x2beg-p2beg);
		base = x-scale*(x2beg+p2beg);
		ya = y;
		ticb = -ticsize;
		numb = ticb-labelcd;
		labelb = numb-labelch;
		grid = grid2;
		label = label2;
	}
	if (grid==SOLID)
		grided = True;
	else if (grid==DASH) {
		grided = True;
		XSetLineAttributes(dpy,gcg,1L,LineOnOffDash,CapButt,JoinMiter);
		dash[0] = 8;  dash[1] = 4;
		XSetDashes(dpy,gcg,0,dash,2);
	} else if (grid==DOT) {
		grided = True;
		XSetLineAttributes(dpy,gcg,1L,LineOnOffDash,CapButt,JoinMiter);
		dash[0] = 1;  dash[1] = 4;
		XSetDashes(dpy,gcg,0,dash,2);
	} else
		grided = False;
	azero = 0.0001*(amax-amin);
	for (anum=fnum; anum<=amax; anum+=dnum) {
		if (anum<amin) continue;
		xa = base+scale*anum;
		if (grided) XDrawLine(dpy,win,gcg,xa,y,xa,y+height);
		XDrawLine(dpy,win,gca,xa,ya,xa,ya+ticb);
		if (anum>-azero && anum<azero)
			sprintf(str,"%1.5g",0.0);
		else
			sprintf(str,"%1.5g",anum);
		lstr = (int) strlen(str);
		tw = XTextWidth(fa,str,lstr);
		XDrawString(dpy,win,gca,xa-tw/2,ya+numb,str,lstr);
	}
	dtic = dnum/ntic;
	for (atic=fnum-ntic*dtic-dtic; atic<=amax; atic+=dtic) {
		if (atic<amin) continue;
		xa = base+scale*atic;
		XDrawLine(dpy,win,gca,xa,ya,xa,ya+ticb/2);
	}
	lstr = (int) strlen(label);
	tw = XTextWidth(fa,label,lstr);
	XDrawString(dpy,win,gca,x+width-tw,ya+labelb,label,lstr);

	/* draw vertical axis */
	if (style==NORMAL) {
		amin = (x2beg<x2end)?x2beg:x2end;
		amax = (x2beg>x2end)?x2beg:x2end;
		dnum = d2num;  fnum = f2num;  ntic = n2tic;
		scale = -height/(x2end+p2end-x2beg-p2beg);
		base = y+height-scale*(x2beg+p2beg);
		grid = grid2;
		label = label2;
	} else {
		amin = (x1beg<x1end)?x1beg:x1end;
		amax = (x1beg>x1end)?x1beg:x1end;
		dnum = d1num;  fnum = f1num;  ntic = n1tic;
		scale = height/(x1end+p1end-x1beg-p1beg);
		base = y-scale*(x1beg+p1beg);
		grid = grid1;
		label = label1;
	}
	xa = x;
	ticb = -ticsize;
	numb = ticb-ticsize/4;
	if (grid==SOLID)
		grided = True;
	else if (grid==DASH) {
		grided = True;
		XSetLineAttributes(dpy,gcg,1L,LineOnOffDash,CapButt,JoinMiter);
		dash[0] = 8;  dash[1] = 4;
		XSetDashes(dpy,gcg,0,dash,2);
	} else if (grid==DOT) {
		grided = True;
		XSetLineAttributes(dpy,gcg,1L,LineOnOffDash,CapButt,JoinMiter);
		dash[0] = 1;  dash[1] = 4;
		XSetDashes(dpy,gcg,0,dash,2);
	} else
		grided = False;
	azero = 0.0001*(amax-amin);
	for (anum=fnum; anum<=amax; anum+=dnum) {
		if (anum<amin) continue;
		ya = base+scale*anum;
		if (grided) XDrawLine(dpy,win,gcg,x,ya,x+width,ya);
		XDrawLine(dpy,win,gca,xa,ya,xa+ticb,ya);
		if (anum>-azero && anum<azero)
			sprintf(str,"%1.5g",0.0);
		else
			sprintf(str,"%1.5g",anum);
		lstr = (int) strlen(str);
		tw = XTextWidth(fa,str,lstr);
		XDrawString(dpy,win,gca,xa+numb-tw,ya+labelca/4,str,lstr);
	}
	dtic = dnum/ntic;
	for (atic=fnum-ntic*dtic-dtic; atic<=amax; atic+=dtic) {
		if (atic<amin) continue;
		ya = base+scale*atic;
		XDrawLine(dpy,win,gca,xa,ya,xa+ticb/2,ya);
	}
	lstr = (int) strlen(label);
	if (style==NORMAL)
		XDrawString(dpy,win,gca,
			x+ticb-9*labelcw,
			y+labelca/4-labelch,label,lstr);
	else
		XDrawString(dpy,win,gca,
			x+ticb-9*labelcw,
			y+height+labelca/4+labelch,label,lstr);
	
	/* draw title */
	lstr = (int) strlen(title);
	tw = XTextWidth(ft,title,lstr);
	if (style==NORMAL)
		XDrawString(dpy,win,gct,
			x+width/2-tw/2,
			y+labelca/4-labelch-labelch,title,lstr);
	else
		XDrawString(dpy,win,gct,
			x+width/2-tw/2,
			y+height+labelca/4+labelch+titleca,title,lstr);

	/* draw axes box */
	XDrawRectangle(dpy,win,gca,x,y,width,height);

	/* free resources before returning */
	XFreeGC(dpy,gca);
	XFreeGC(dpy,gct);
	XFreeGC(dpy,gcg);
	XFreeFont(dpy,fa);
	XFreeFont(dpy,ft);
}

void
xSizeAxesBox (Display *dpy, Window win, 
	char *labelfont, char *titlefont, int style,
	int *x, int *y, int *width, int *height)
/*****************************************************************************
determine optimal origin and size for a labeled axes box
******************************************************************************
Input:
dpy		display pointer
win		window
labelfont	name of font to use for axes labels
titlefont	name of font to use for title
int style	NORMAL (axis 1 on bottom, axis 2 on left)
		SEISMIC (axis 1 on left, axis 2 on top)

Output:
x		x coordinate of upper left corner of box
y		y coordinate of upper left corner of box
width		width of box
height		height of box
******************************************************************************
Notes:
xSizeAxesBox is intended to be used prior to xDrawAxesBox.

An "optimal" axes box is one that more or less fills the window, 
with little wasted space around the edges of the window.
******************************************************************************
Author:		Dave Hale, Colorado School of Mines, 01/27/90
*****************************************************************************/
{
	XFontStruct *fa,*ft;
	XWindowAttributes attr;
	int labelch,labelcw,titlech,bl,bt,br,bb;

	/* get fonts and determine character dimensions */
	fa = XLoadQueryFont(dpy,labelfont);
	if (fa==NULL) fa = XLoadQueryFont(dpy,"fixed");
	if (fa==NULL) {
		fprintf(stderr,"Cannot load/query labelfont=%s\n",labelfont);
		exit(-1);
	}
	labelch = fa->max_bounds.ascent+fa->max_bounds.descent;
	labelcw = fa->max_bounds.lbearing+fa->max_bounds.rbearing;
	ft = XLoadQueryFont(dpy,titlefont);
	if (ft==NULL) ft = XLoadQueryFont(dpy,"fixed");
	if (ft==NULL) {
		fprintf(stderr,"Cannot load/query titlefont=%s\n",titlefont);
		exit(-1);
	}
	titlech = ft->max_bounds.ascent+ft->max_bounds.descent;

	/* determine axes box origin and size */
	XGetWindowAttributes(dpy,win,&attr);
	bl = 10*labelcw;
	br = attr.width-5*labelcw;
	while (br<=bl) {
		br += labelcw;
		bl -= labelcw;
	}
	if (bl<0) bl = 0;
	if (br>attr.width) br = attr.width;
	if (style==NORMAL) {
		bt = labelch+labelch/2+titlech;
		bb = attr.height-3*labelch;
	} else {
		bt = 3*labelch;
		bb = attr.height-labelch-labelch/2-titlech;
	}
	while (bb<=bt) {
		bb += labelch;
		bt -= labelch;
	}
	if (bt<0) bt = 0;
	if (bb>attr.height) bb = attr.height;
	
	*x = bl;
	*y = bt;
	*width = br-bl;
	*height = bb-bt;

	XFreeFont(dpy,fa);
	XFreeFont(dpy,ft);
}