tkrectoval.c

linux系统下的音频通信

 *	distance from the point to the oval.  If itemPtr is filled,
 *	then anywhere in the interior is considered "inside"; if
 *	itemPtr isn't filled, then "inside" means only the area
 *	occupied by the outline.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

	/* ARGSUSED */
static double
OvalToPoint(canvas, itemPtr, pointPtr)
    Tk_Canvas canvas;		/* Canvas containing item. */
    Tk_Item *itemPtr;		/* Item to check against point. */
    double *pointPtr;		/* Pointer to x and y coordinates. */
{
    RectOvalItem *ovalPtr = (RectOvalItem *) itemPtr;
    double width;
    int filled;

    width = ovalPtr->width;
    filled = ovalPtr->fillGC != None;
    if (ovalPtr->outlineGC == None) {
	width = 0.0;
	filled = 1;
    }
    return TkOvalToPoint(ovalPtr->bbox, width, filled, pointPtr);
}

/*
 *--------------------------------------------------------------
 *
 * RectToArea --
 *
 *	This procedure is called to determine whether an item
 *	lies entirely inside, entirely outside, or overlapping
 *	a given rectangle.
 *
 * Results:
 *	-1 is returned if the item is entirely outside the area
 *	given by rectPtr, 0 if it overlaps, and 1 if it is entirely
 *	inside the given area.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

	/* ARGSUSED */
static int
RectToArea(canvas, itemPtr, areaPtr)
    Tk_Canvas canvas;		/* Canvas containing item. */
    Tk_Item *itemPtr;		/* Item to check against rectangle. */
    double *areaPtr;		/* Pointer to array of four coordinates
				 * (x1, y1, x2, y2) describing rectangular
				 * area.  */
{
    RectOvalItem *rectPtr = (RectOvalItem *) itemPtr;
    double halfWidth;

    halfWidth = rectPtr->width/2.0;
    if (rectPtr->outlineGC == None) {
	halfWidth = 0.0;
    }

    if ((areaPtr[2] <= (rectPtr->bbox[0] - halfWidth))
	    || (areaPtr[0] >= (rectPtr->bbox[2] + halfWidth))
	    || (areaPtr[3] <= (rectPtr->bbox[1] - halfWidth))
	    || (areaPtr[1] >= (rectPtr->bbox[3] + halfWidth))) {
	return -1;
    }
    if ((rectPtr->fillGC == None) && (rectPtr->outlineGC != None)
	    && (areaPtr[0] >= (rectPtr->bbox[0] + halfWidth))
	    && (areaPtr[1] >= (rectPtr->bbox[1] + halfWidth))
	    && (areaPtr[2] <= (rectPtr->bbox[2] - halfWidth))
	    && (areaPtr[3] <= (rectPtr->bbox[3] - halfWidth))) {
	return -1;
    }
    if ((areaPtr[0] <= (rectPtr->bbox[0] - halfWidth))
	    && (areaPtr[1] <= (rectPtr->bbox[1] - halfWidth))
	    && (areaPtr[2] >= (rectPtr->bbox[2] + halfWidth))
	    && (areaPtr[3] >= (rectPtr->bbox[3] + halfWidth))) {
	return 1;
    }
    return 0;
}

/*
 *--------------------------------------------------------------
 *
 * OvalToArea --
 *
 *	This procedure is called to determine whether an item
 *	lies entirely inside, entirely outside, or overlapping
 *	a given rectangular area.
 *
 * Results:
 *	-1 is returned if the item is entirely outside the area
 *	given by rectPtr, 0 if it overlaps, and 1 if it is entirely
 *	inside the given area.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

	/* ARGSUSED */
static int
OvalToArea(canvas, itemPtr, areaPtr)
    Tk_Canvas canvas;		/* Canvas containing item. */
    Tk_Item *itemPtr;		/* Item to check against oval. */
    double *areaPtr;		/* Pointer to array of four coordinates
				 * (x1, y1, x2, y2) describing rectangular
				 * area.  */
{
    RectOvalItem *ovalPtr = (RectOvalItem *) itemPtr;
    double oval[4], halfWidth;
    int result;

    /*
     * Expand the oval to include the width of the outline, if any.
     */

    halfWidth = ovalPtr->width/2.0;
    if (ovalPtr->outlineGC == None) {
	halfWidth = 0.0;
    }
    oval[0] = ovalPtr->bbox[0] - halfWidth;
    oval[1] = ovalPtr->bbox[1] - halfWidth;
    oval[2] = ovalPtr->bbox[2] + halfWidth;
    oval[3] = ovalPtr->bbox[3] + halfWidth;

    result = TkOvalToArea(oval, areaPtr);

    /*
     * If the rectangle appears to overlap the oval and the oval
     * isn't filled, do one more check to see if perhaps all four
     * of the rectangle's corners are totally inside the oval's
     * unfilled center, in which case we should return "outside".
     */

    if ((result == 0) && (ovalPtr->outlineGC != None)
	    && (ovalPtr->fillGC == None)) {
	double centerX, centerY, width, height;
	double xDelta1, yDelta1, xDelta2, yDelta2;

	centerX = (ovalPtr->bbox[0] + ovalPtr->bbox[2])/2.0;
	centerY = (ovalPtr->bbox[1] + ovalPtr->bbox[3])/2.0;
	width = (ovalPtr->bbox[2] - ovalPtr->bbox[0])/2.0 - halfWidth;
	height = (ovalPtr->bbox[3] - ovalPtr->bbox[1])/2.0 - halfWidth;
	xDelta1 = (areaPtr[0] - centerX)/width;
	xDelta1 *= xDelta1;
	yDelta1 = (areaPtr[1] - centerY)/height;
	yDelta1 *= yDelta1;
	xDelta2 = (areaPtr[2] - centerX)/width;
	xDelta2 *= xDelta2;
	yDelta2 = (areaPtr[3] - centerY)/height;
	yDelta2 *= yDelta2;
	if (((xDelta1 + yDelta1) < 1.0)
		&& ((xDelta1 + yDelta2) < 1.0)
		&& ((xDelta2 + yDelta1) < 1.0)
		&& ((xDelta2 + yDelta2) < 1.0)) {
	    return -1;
	}
    }
    return result;
}

/*
 *--------------------------------------------------------------
 *
 * ScaleRectOval --
 *
 *	This procedure is invoked to rescale a rectangle or oval
 *	item.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The rectangle or oval referred to by itemPtr is rescaled
 *	so that the following transformation is applied to all
 *	point coordinates:
 *		x' = originX + scaleX*(x-originX)
 *		y' = originY + scaleY*(y-originY)
 *
 *--------------------------------------------------------------
 */

static void
ScaleRectOval(canvas, itemPtr, originX, originY, scaleX, scaleY)
    Tk_Canvas canvas;			/* Canvas containing rectangle. */
    Tk_Item *itemPtr;			/* Rectangle to be scaled. */
    double originX, originY;		/* Origin about which to scale rect. */
    double scaleX;			/* Amount to scale in X direction. */
    double scaleY;			/* Amount to scale in Y direction. */
{
    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;

    rectOvalPtr->bbox[0] = originX + scaleX*(rectOvalPtr->bbox[0] - originX);
    rectOvalPtr->bbox[1] = originY + scaleY*(rectOvalPtr->bbox[1] - originY);
    rectOvalPtr->bbox[2] = originX + scaleX*(rectOvalPtr->bbox[2] - originX);
    rectOvalPtr->bbox[3] = originY + scaleY*(rectOvalPtr->bbox[3] - originY);
    ComputeRectOvalBbox(canvas, rectOvalPtr);
}

/*
 *--------------------------------------------------------------
 *
 * TranslateRectOval --
 *
 *	This procedure is called to move a rectangle or oval by a
 *	given amount.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The position of the rectangle or oval is offset by
 *	(xDelta, yDelta), and the bounding box is updated in the
 *	generic part of the item structure.
 *
 *--------------------------------------------------------------
 */

static void
TranslateRectOval(canvas, itemPtr, deltaX, deltaY)
    Tk_Canvas canvas;			/* Canvas containing item. */
    Tk_Item *itemPtr;			/* Item that is being moved. */
    double deltaX, deltaY;		/* Amount by which item is to be
					 * moved. */
{
    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;

    rectOvalPtr->bbox[0] += deltaX;
    rectOvalPtr->bbox[1] += deltaY;
    rectOvalPtr->bbox[2] += deltaX;
    rectOvalPtr->bbox[3] += deltaY;
    ComputeRectOvalBbox(canvas, rectOvalPtr);
}

/*
 *--------------------------------------------------------------
 *
 * RectOvalToPostscript --
 *
 *	This procedure is called to generate Postscript for
 *	rectangle and oval items.
 *
 * Results:
 *	The return value is a standard Tcl result.  If an error
 *	occurs in generating Postscript then an error message is
 *	left in interp->result, replacing whatever used to be there.
 *	If no error occurs, then Postscript for the rectangle is
 *	appended to the result.
 *
 * Side effects:
 *	None.
 *
 *--------------------------------------------------------------
 */

static int
RectOvalToPostscript(interp, canvas, itemPtr, prepass)
    Tcl_Interp *interp;			/* Interpreter for error reporting. */
    Tk_Canvas canvas;			/* Information about overall canvas. */
    Tk_Item *itemPtr;			/* Item for which Postscript is
					 * wanted. */
    int prepass;			/* 1 means this is a prepass to
					 * collect font information;  0 means
					 * final Postscript is being created. */
{
    char pathCmd[500], string[100];
    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
    double y1, y2;

    y1 = Tk_CanvasPsY(canvas, rectOvalPtr->bbox[1]);
    y2 = Tk_CanvasPsY(canvas, rectOvalPtr->bbox[3]);

    /*
     * Generate a string that creates a path for the rectangle or oval.
     * This is the only part of the procedure's code that is type-
     * specific.
     */


    if (rectOvalPtr->header.typePtr == &tkRectangleType) {
	sprintf(pathCmd, "%.15g %.15g moveto %.15g 0 rlineto 0 %.15g rlineto %.15g 0 rlineto closepath\n",
		rectOvalPtr->bbox[0], y1,
		rectOvalPtr->bbox[2]-rectOvalPtr->bbox[0], y2-y1,
		rectOvalPtr->bbox[0]-rectOvalPtr->bbox[2]);
    } else {
	sprintf(pathCmd, "matrix currentmatrix\n%.15g %.15g translate %.15g %.15g scale 1 0 moveto 0 0 1 0 360 arc\nsetmatrix\n",
		(rectOvalPtr->bbox[0] + rectOvalPtr->bbox[2])/2, (y1 + y2)/2,
		(rectOvalPtr->bbox[2] - rectOvalPtr->bbox[0])/2, (y1 - y2)/2);
    }

    /*
     * First draw the filled area of the rectangle.
     */

    if (rectOvalPtr->fillColor != NULL) {
	Tcl_AppendResult(interp, pathCmd, (char *) NULL);
	if (Tk_CanvasPsColor(interp, canvas, rectOvalPtr->fillColor)
		!= TCL_OK) {
	    return TCL_ERROR;
	}
	if (rectOvalPtr->fillStipple != None) {
	    Tcl_AppendResult(interp, "clip ", (char *) NULL);
	    if (Tk_CanvasPsStipple(interp, canvas, rectOvalPtr->fillStipple)
		    != TCL_OK) {
		return TCL_ERROR;
	    }
	    if (rectOvalPtr->outlineColor != NULL) {
		Tcl_AppendResult(interp, "grestore gsave\n", (char *) NULL);
	    }
	} else {
	    Tcl_AppendResult(interp, "fill\n", (char *) NULL);
	}
    }

    /*
     * Now draw the outline, if there is one.
     */

    if (rectOvalPtr->outlineColor != NULL) {
	Tcl_AppendResult(interp, pathCmd, (char *) NULL);
	sprintf(string, "%d setlinewidth", rectOvalPtr->width);
	Tcl_AppendResult(interp, string,
		" 0 setlinejoin 2 setlinecap\n", (char *) NULL);
	if (Tk_CanvasPsColor(interp, canvas, rectOvalPtr->outlineColor)
		!= TCL_OK) {
	    return TCL_ERROR;
	}
	Tcl_AppendResult(interp, "stroke\n", (char *) NULL);
    }
    return TCL_OK;
}