/* true.c 1.1 */
/*
    Copyright 1992, 1993 O'Reilly and Associates, Inc.  Permission to
    use, copy, and modify this program is hereby granted, as long as
    this copyright notice appears in each copy of the program source
    code.
*/

#include "book_utils.h"

#define WIN_GEOM	"500x500+50+50"

extern void	redraw();


main( argc, argv )
    int		argc;
    char	*argv[];
{
    Display			*dpy;
    Window			window;
    XEvent			event;
    XVisualInfo			*vis_info, vis_templ;
    XColor			bkgd_color;
    XStandardColormap		cmap_info;
    PEXColorApproxEntry		capx_info;
    PEXRenderer			renderer;
    PEXRendererAttributes	rattrs;
    PEXExtensionInfo		*pexinfo;
    int				done = 0, num_vis;
    
    
    /* Open a display and initialize PEX. */
    dpy = ora_init_pex( argv, &pexinfo );
    if ( !dpy ) exit(1);
    
    /* Get a TrueColor visual. */
    vis_templ.screen = DefaultScreen( dpy );
    vis_templ.class = TrueColor;
    vis_info = XGetVisualInfo( dpy,
	VisualScreenMask | VisualClassMask ,
	&vis_templ, &num_vis );
    if ( num_vis == 0 ) {
	fprintf ( stderr, "No TrueColor visual.\n" );
	exit(1);
    }
    
    /* Create a colormap for the visual. */
    if ( !ora_create_colormap( dpy, vis_info, &cmap_info, &capx_info ) ) {
	fprintf ( stderr, "Cannot create a colormap\n" );
	exit(1);
    }

    /* Create the window, giving it a gray background. */
    bkgd_color.red = bkgd_color.green = bkgd_color.blue = 0x5555;
    bkgd_color.flags = DoRed | DoGreen | DoBlue;
    window = ora_create_window( dpy, vis_info, &cmap_info, WIN_GEOM,
			        &bkgd_color );

    /* Set up the PEX renderer. */
    if ( IMMED_MODE_SPT( pexinfo ) ) {
	renderer = ora_setup_renderer( dpy, window, &capx_info,
				       &rattrs );
    } else {
	fprintf( stderr, "No immediate mode.\n" );
	exit(1);
    }
    
    /* Read and respond to X events. */
    XSelectInput( dpy, window, ExposureMask | ButtonPressMask );
    while ( !done ) {
	XNextEvent( dpy, &event );
	switch ( event.type ) {
	case Expose:
	    /* Flush remaining Expose events, then redraw. */
	    while ( XCheckTypedWindowEvent( dpy, window,
					    Expose, &event ) )
		; /* empty statement */
	    redraw( dpy, window, renderer );
	    break;
	case ButtonPress:
	    done = 1;
	    break;
	}
    }

    XCloseDisplay( dpy );
    return 0;
}
	
static PEXCoord2D	border[2][4] = {
    /* outer contour */	{{0,0},{1,0},{1,1},{0,1}},
    /* inner contour */	{{.05,.05},{.95,.05},{.95,.95},{.05,.95}} };

static char		*title = "World Population";
static PEXCoord2D	title_spot = {.5, .82};

static char		*subtitle = "in billions";
static PEXCoord2D	subtitle_spot = {.5, .75};

static char		*label_1900 = "1900";
static PEXCoord2D	label_1900_spot = {.20, .15};
static char		*amount_1900 = "1.6";
static PEXCoord2D	amount_1900_spot = {.33, .24};
static PEXCoord2D	bar_1900[] =
			{{.28,.05},{.38,.05},{.38,.19},{.28,.19}};

static char		*label_2000 = "2000";
static PEXCoord2D	label_2000_spot = {.53, .15};
static char		*amount_2000 = "6.1 (projected)";
static PEXCoord2D	amount_2000_spot = {.66, .65};
static PEXCoord2D	bar_2000[] =
			{{.61,.05},{.71,.05},{.71,.6},{.61,.6}};

void
redraw( dpy, window, renderer )
    Display	*dpy;
    Window	window;
    PEXRenderer	renderer;
{
    PEXColor		red, yellow, white, blue;
    PEXListOfCoord2D	contours[2];
    
    /* Define the colors we'll use. */
    SET_COLOR( 1.0, 0.0, 0.0, red )
    SET_COLOR( 1.0, 1.0, 0.0, yellow )
    SET_COLOR( 1.0, 1.0, 1.0, white )
    SET_COLOR( 0.0, 0.0, 1.0, blue )
    
    /* Redraw the window, after first erasing (clearing) it. */
    XClearWindow( dpy, window );
    PEXBeginRendering( dpy, window, renderer ); {
    
	/* Set the text alignment for the title and all labels. */
	PEXSetTextAlignment( dpy, renderer, PEXOCRender,
			    PEXHAlignCenter, PEXVAlignBase );
	
	/* The border. */
	PEXSetSurfaceEdgeFlag( dpy, renderer, PEXOCRender, PEXOn );
	PEXSetSurfaceEdgeColor( dpy, renderer, PEXOCRender,
			       PEXColorTypeRGB, &white );
	PEXSetSurfaceColor( dpy, renderer, PEXOCRender,
			       PEXColorTypeRGB,  &blue );
	PEXSetInteriorStyle( dpy, renderer, PEXOCRender,
			    PEXInteriorStyleSolid );
	contours[0].points = border[0]; contours[0].count = 4;
	contours[1].points = border[1]; contours[1].count = 4;
	PEXFillAreaSet2D( dpy, renderer, PEXOCRender, PEXShapeConvex,
			 False, PEXContourNested, 2, contours );
	
	/* The title. */
	PEXSetTextColor( dpy, renderer, PEXOCRender,
			PEXColorTypeRGB,  &white );
	PEXSetCharHeight( dpy, renderer, PEXOCRender, 0.04 );
	PEXText2D( dpy, renderer, PEXOCRender, &title_spot,
		  strlen(title), title );
	PEXSetCharHeight( dpy, renderer, PEXOCRender, 0.02 );
	PEXText2D( dpy, renderer, PEXOCRender, &subtitle_spot,
		  strlen(subtitle), subtitle );

	/* The 1900 bar. */
	PEXSetSurfaceColor( dpy, renderer, PEXOCRender,
			   PEXColorTypeRGB,  &red );
	PEXFillArea2D( dpy, renderer, PEXOCRender, PEXShapeConvex, True,
		      4, bar_1900 );

	/* The 1900 bar label. */
	PEXSetTextColor( dpy, renderer, PEXOCRender,
			       PEXColorTypeRGB,  &yellow );
	PEXSetCharHeight( dpy, renderer, PEXOCRender, 0.015 );
	PEXText2D( dpy, renderer, PEXOCRender, &label_1900_spot,
		  strlen(label_1900), label_1900 );
	PEXText2D( dpy, renderer, PEXOCRender, &amount_1900_spot,
		  strlen(amount_1900), amount_1900 );

	/* The 2000 bar. */
	PEXSetSurfaceEdgeType( dpy, renderer, PEXOCRender,
			      PEXSurfaceEdgeDashed );
	PEXFillArea2D( dpy, renderer, PEXOCRender, PEXShapeConvex, False,
		      4, bar_2000 );

	/* The 2000 bar label. */
	PEXText2D( dpy, renderer, PEXOCRender, &label_2000_spot,
		  strlen(label_2000), label_2000 );
	PEXText2D( dpy, renderer, PEXOCRender, &amount_2000_spot,
		  strlen(amount_2000) , amount_2000 );
    }
    PEXEndRendering( dpy, renderer, True );
    XFlush( dpy );
}