tkrectoval.c

linux系统下的音频通信

/* 
 * tkRectOval.c --
 *
 *	This file implements rectangle and oval items for canvas
 *	widgets.
 *
 * Copyright (c) 1991-1994 The Regents of the University of California.
 * Copyright (c) 1994-1996 Sun Microsystems, Inc.
 *
 * See the file "license.terms" for information on usage and redistribution
 * of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 *
 * SCCS: @(#) tkRectOval.c 1.40 96/05/03 10:52:21
 */

#include <stdio.h>
#include "tk.h"
#include "tkInt.h"
#include "tkPort.h"

/*
 * The structure below defines the record for each rectangle/oval item.
 */

typedef struct RectOvalItem  {
    Tk_Item header;		/* Generic stuff that's the same for all
				 * types.  MUST BE FIRST IN STRUCTURE. */
    double bbox[4];		/* Coordinates of bounding box for rectangle
				 * or oval (x1, y1, x2, y2).  Item includes
				 * x1 and x2 but not y1 and y2. */
    int width;			/* Width of outline. */
    XColor *outlineColor;	/* Color for outline. */
    XColor *fillColor;		/* Color for filling rectangle/oval. */
    Pixmap fillStipple;		/* Stipple bitmap for filling item. */
    GC outlineGC;		/* Graphics context for outline. */
    GC fillGC;			/* Graphics context for filling item. */
} RectOvalItem;

/*
 * Information used for parsing configuration specs:
 */

static Tk_CustomOption tagsOption = {Tk_CanvasTagsParseProc,
    Tk_CanvasTagsPrintProc, (ClientData) NULL
};

static Tk_ConfigSpec configSpecs[] = {
    {TK_CONFIG_COLOR, "-fill", (char *) NULL, (char *) NULL,
	(char *) NULL, Tk_Offset(RectOvalItem, fillColor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_COLOR, "-outline", (char *) NULL, (char *) NULL,
	"black", Tk_Offset(RectOvalItem, outlineColor), TK_CONFIG_NULL_OK},
    {TK_CONFIG_BITMAP, "-stipple", (char *) NULL, (char *) NULL,
	(char *) NULL, Tk_Offset(RectOvalItem, fillStipple), TK_CONFIG_NULL_OK},
    {TK_CONFIG_CUSTOM, "-tags", (char *) NULL, (char *) NULL,
	(char *) NULL, 0, TK_CONFIG_NULL_OK, &tagsOption},
    {TK_CONFIG_PIXELS, "-width", (char *) NULL, (char *) NULL,
	"1", Tk_Offset(RectOvalItem, width), TK_CONFIG_DONT_SET_DEFAULT},
    {TK_CONFIG_END, (char *) NULL, (char *) NULL, (char *) NULL,
	(char *) NULL, 0, 0}
};

/*
 * Prototypes for procedures defined in this file:
 */

static void		ComputeRectOvalBbox _ANSI_ARGS_((Tk_Canvas canvas,
			    RectOvalItem *rectOvalPtr));
static int		ConfigureRectOval _ANSI_ARGS_((Tcl_Interp *interp,
			    Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
			    char **argv, int flags));
static int		CreateRectOval _ANSI_ARGS_((Tcl_Interp *interp,
			    Tk_Canvas canvas, struct Tk_Item *itemPtr,
			    int argc, char **argv));
static void		DeleteRectOval _ANSI_ARGS_((Tk_Canvas canvas,
			    Tk_Item *itemPtr, Display *display));
static void		DisplayRectOval _ANSI_ARGS_((Tk_Canvas canvas,
			    Tk_Item *itemPtr, Display *display, Drawable dst,
			    int x, int y, int width, int height));
static int		OvalToArea _ANSI_ARGS_((Tk_Canvas canvas,
			    Tk_Item *itemPtr, double *areaPtr));
static double		OvalToPoint _ANSI_ARGS_((Tk_Canvas canvas,
			    Tk_Item *itemPtr, double *pointPtr));
static int		RectOvalCoords _ANSI_ARGS_((Tcl_Interp *interp,
			    Tk_Canvas canvas, Tk_Item *itemPtr, int argc,
			    char **argv));
static int		RectOvalToPostscript _ANSI_ARGS_((Tcl_Interp *interp,
			    Tk_Canvas canvas, Tk_Item *itemPtr, int prepass));
static int		RectToArea _ANSI_ARGS_((Tk_Canvas canvas,
			    Tk_Item *itemPtr, double *areaPtr));
static double		RectToPoint _ANSI_ARGS_((Tk_Canvas canvas,
			    Tk_Item *itemPtr, double *pointPtr));
static void		ScaleRectOval _ANSI_ARGS_((Tk_Canvas canvas,
			    Tk_Item *itemPtr, double originX, double originY,
			    double scaleX, double scaleY));
static void		TranslateRectOval _ANSI_ARGS_((Tk_Canvas canvas,
			    Tk_Item *itemPtr, double deltaX, double deltaY));

/*
 * The structures below defines the rectangle and oval item types
 * by means of procedures that can be invoked by generic item code.
 */

Tk_ItemType tkRectangleType = {
    "rectangle",			/* name */
    sizeof(RectOvalItem),		/* itemSize */
    CreateRectOval,			/* createProc */
    configSpecs,			/* configSpecs */
    ConfigureRectOval,			/* configureProc */
    RectOvalCoords,			/* coordProc */
    DeleteRectOval,			/* deleteProc */
    DisplayRectOval,			/* displayProc */
    0,					/* alwaysRedraw */
    RectToPoint,			/* pointProc */
    RectToArea,				/* areaProc */
    RectOvalToPostscript,		/* postscriptProc */
    ScaleRectOval,			/* scaleProc */
    TranslateRectOval,			/* translateProc */
    (Tk_ItemIndexProc *) NULL,		/* indexProc */
    (Tk_ItemCursorProc *) NULL,		/* icursorProc */
    (Tk_ItemSelectionProc *) NULL,	/* selectionProc */
    (Tk_ItemInsertProc *) NULL,		/* insertProc */
    (Tk_ItemDCharsProc *) NULL,		/* dTextProc */
    (Tk_ItemType *) NULL		/* nextPtr */
};

Tk_ItemType tkOvalType = {
    "oval",				/* name */
    sizeof(RectOvalItem),		/* itemSize */
    CreateRectOval,			/* createProc */
    configSpecs,			/* configSpecs */
    ConfigureRectOval,			/* configureProc */
    RectOvalCoords,			/* coordProc */
    DeleteRectOval,			/* deleteProc */
    DisplayRectOval,			/* displayProc */
    0,					/* alwaysRedraw */
    OvalToPoint,			/* pointProc */
    OvalToArea,				/* areaProc */
    RectOvalToPostscript,		/* postscriptProc */
    ScaleRectOval,			/* scaleProc */
    TranslateRectOval,			/* translateProc */
    (Tk_ItemIndexProc *) NULL,		/* indexProc */
    (Tk_ItemCursorProc *) NULL,		/* cursorProc */
    (Tk_ItemSelectionProc *) NULL,	/* selectionProc */
    (Tk_ItemInsertProc *) NULL,		/* insertProc */
    (Tk_ItemDCharsProc *) NULL,		/* dTextProc */
    (Tk_ItemType *) NULL		/* nextPtr */
};

/*
 *--------------------------------------------------------------
 *
 * CreateRectOval --
 *
 *	This procedure is invoked to create a new rectangle
 *	or oval item in a canvas.
 *
 * Results:
 *	A standard Tcl return value.  If an error occurred in
 *	creating the item, then an error message is left in
 *	interp->result;  in this case itemPtr is left uninitialized,
 *	so it can be safely freed by the caller.
 *
 * Side effects:
 *	A new rectangle or oval item is created.
 *
 *--------------------------------------------------------------
 */

static int
CreateRectOval(interp, canvas, itemPtr, argc, argv)
    Tcl_Interp *interp;			/* For error reporting. */
    Tk_Canvas canvas;			/* Canvas to hold new item. */
    Tk_Item *itemPtr;			/* Record to hold new item;  header
					 * has been initialized by caller. */
    int argc;				/* Number of arguments in argv. */
    char **argv;			/* Arguments describing rectangle. */
{
    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;

    if (argc < 4) {
	Tcl_AppendResult(interp, "wrong # args: should be \"",
		Tk_PathName(Tk_CanvasTkwin(canvas)), " create ",
		itemPtr->typePtr->name, " x1 y1 x2 y2 ?options?\"",
		(char *) NULL);
	return TCL_ERROR;
    }

    /*
     * Carry out initialization that is needed in order to clean
     * up after errors during the the remainder of this procedure.
     */

    rectOvalPtr->width = 1;
    rectOvalPtr->outlineColor = NULL;
    rectOvalPtr->fillColor = NULL;
    rectOvalPtr->fillStipple = None;
    rectOvalPtr->outlineGC = None;
    rectOvalPtr->fillGC = None;

    /*
     * Process the arguments to fill in the item record.
     */

    if ((Tk_CanvasGetCoord(interp, canvas, argv[0],
		&rectOvalPtr->bbox[0]) != TCL_OK)
	    || (Tk_CanvasGetCoord(interp, canvas, argv[1],
		&rectOvalPtr->bbox[1]) != TCL_OK)
	    || (Tk_CanvasGetCoord(interp, canvas, argv[2],
		    &rectOvalPtr->bbox[2]) != TCL_OK)
	    || (Tk_CanvasGetCoord(interp, canvas, argv[3],
		    &rectOvalPtr->bbox[3]) != TCL_OK)) {
	return TCL_ERROR;
    }

    if (ConfigureRectOval(interp, canvas, itemPtr, argc-4, argv+4, 0)
	    != TCL_OK) {
	DeleteRectOval(canvas, itemPtr, Tk_Display(Tk_CanvasTkwin(canvas)));
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * RectOvalCoords --
 *
 *	This procedure is invoked to process the "coords" widget
 *	command on rectangles and ovals.  See the user documentation
 *	for details on what it does.
 *
 * Results:
 *	Returns TCL_OK or TCL_ERROR, and sets interp->result.
 *
 * Side effects:
 *	The coordinates for the given item may be changed.
 *
 *--------------------------------------------------------------
 */

static int
RectOvalCoords(interp, canvas, itemPtr, argc, argv)
    Tcl_Interp *interp;			/* Used for error reporting. */
    Tk_Canvas canvas;			/* Canvas containing item. */
    Tk_Item *itemPtr;			/* Item whose coordinates are to be
					 * read or modified. */
    int argc;				/* Number of coordinates supplied in
					 * argv. */
    char **argv;			/* Array of coordinates: x1, y1,
					 * x2, y2, ... */
{
    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
    char c0[TCL_DOUBLE_SPACE], c1[TCL_DOUBLE_SPACE];
    char c2[TCL_DOUBLE_SPACE], c3[TCL_DOUBLE_SPACE];

    if (argc == 0) {
	Tcl_PrintDouble(interp, rectOvalPtr->bbox[0], c0);
	Tcl_PrintDouble(interp, rectOvalPtr->bbox[1], c1);
	Tcl_PrintDouble(interp, rectOvalPtr->bbox[2], c2);
	Tcl_PrintDouble(interp, rectOvalPtr->bbox[3], c3);
	Tcl_AppendResult(interp, c0, " ", c1, " ", c2, " ", c3,
		(char *) NULL);
    } else if (argc == 4) {
	if ((Tk_CanvasGetCoord(interp, canvas, argv[0],
		    &rectOvalPtr->bbox[0]) != TCL_OK)
		|| (Tk_CanvasGetCoord(interp, canvas, argv[1],
		    &rectOvalPtr->bbox[1]) != TCL_OK)
		|| (Tk_CanvasGetCoord(interp, canvas, argv[2],
			&rectOvalPtr->bbox[2]) != TCL_OK)
		|| (Tk_CanvasGetCoord(interp, canvas, argv[3],
			&rectOvalPtr->bbox[3]) != TCL_OK)) {
	    return TCL_ERROR;
	}
	ComputeRectOvalBbox(canvas, rectOvalPtr);
    } else {
	sprintf(interp->result,
		"wrong # coordinates: expected 0 or 4, got %d",
		argc);
	return TCL_ERROR;
    }
    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * ConfigureRectOval --
 *
 *	This procedure is invoked to configure various aspects
 *	of a rectangle or oval item, such as its border and
 *	background colors.
 *
 * Results:
 *	A standard Tcl result code.  If an error occurs, then
 *	an error message is left in interp->result.
 *
 * Side effects:
 *	Configuration information, such as colors and stipple
 *	patterns, may be set for itemPtr.
 *
 *--------------------------------------------------------------
 */

static int
ConfigureRectOval(interp, canvas, itemPtr, argc, argv, flags)
    Tcl_Interp *interp;		/* Used for error reporting. */
    Tk_Canvas canvas;		/* Canvas containing itemPtr. */
    Tk_Item *itemPtr;		/* Rectangle item to reconfigure. */
    int argc;			/* Number of elements in argv.  */
    char **argv;		/* Arguments describing things to configure. */
    int flags;			/* Flags to pass to Tk_ConfigureWidget. */
{
    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
    XGCValues gcValues;
    GC newGC;
    unsigned long mask;
    Tk_Window tkwin;

    tkwin = Tk_CanvasTkwin(canvas);
    if (Tk_ConfigureWidget(interp, tkwin, configSpecs, argc, argv,
	    (char *) rectOvalPtr, flags) != TCL_OK) {
	return TCL_ERROR;
    }

    /*
     * A few of the options require additional processing, such as
     * graphics contexts.
     */

    if (rectOvalPtr->width < 1) {
	rectOvalPtr->width = 1;
    }
    if (rectOvalPtr->outlineColor == NULL) {
	newGC = None;
    } else {
	gcValues.foreground = rectOvalPtr->outlineColor->pixel;
	gcValues.cap_style = CapProjecting;
	gcValues.line_width = rectOvalPtr->width;
	mask = GCForeground|GCCapStyle|GCLineWidth;
	newGC = Tk_GetGC(tkwin, mask, &gcValues);
    }
    if (rectOvalPtr->outlineGC != None) {
	Tk_FreeGC(Tk_Display(tkwin), rectOvalPtr->outlineGC);
    }