tkrectoval.c

linux系统下的音频通信

    rectOvalPtr->outlineGC = newGC;

    if (rectOvalPtr->fillColor == NULL) {
	newGC = None;
    } else {
	gcValues.foreground = rectOvalPtr->fillColor->pixel;
	if (rectOvalPtr->fillStipple != None) {
	    gcValues.stipple = rectOvalPtr->fillStipple;
	    gcValues.fill_style = FillStippled;
	    mask = GCForeground|GCStipple|GCFillStyle;
	} else {
	    mask = GCForeground;
	}
	newGC = Tk_GetGC(tkwin, mask, &gcValues);
    }
    if (rectOvalPtr->fillGC != None) {
	Tk_FreeGC(Tk_Display(tkwin), rectOvalPtr->fillGC);
    }
    rectOvalPtr->fillGC = newGC;
    ComputeRectOvalBbox(canvas, rectOvalPtr);

    return TCL_OK;
}

/*
 *--------------------------------------------------------------
 *
 * DeleteRectOval --
 *
 *	This procedure is called to clean up the data structure
 *	associated with a rectangle or oval item.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Resources associated with itemPtr are released.
 *
 *--------------------------------------------------------------
 */

static void
DeleteRectOval(canvas, itemPtr, display)
    Tk_Canvas canvas;			/* Info about overall widget. */
    Tk_Item *itemPtr;			/* Item that is being deleted. */
    Display *display;			/* Display containing window for
					 * canvas. */
{
    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;

    if (rectOvalPtr->outlineColor != NULL) {
	Tk_FreeColor(rectOvalPtr->outlineColor);
    }
    if (rectOvalPtr->fillColor != NULL) {
	Tk_FreeColor(rectOvalPtr->fillColor);
    }
    if (rectOvalPtr->fillStipple != None) {
	Tk_FreeBitmap(display, rectOvalPtr->fillStipple);
    }
    if (rectOvalPtr->outlineGC != None) {
	Tk_FreeGC(display, rectOvalPtr->outlineGC);
    }
    if (rectOvalPtr->fillGC != None) {
	Tk_FreeGC(display, rectOvalPtr->fillGC);
    }
}

/*
 *--------------------------------------------------------------
 *
 * ComputeRectOvalBbox --
 *
 *	This procedure is invoked to compute the bounding box of
 *	all the pixels that may be drawn as part of a rectangle
 *	or oval.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	The fields x1, y1, x2, and y2 are updated in the header
 *	for itemPtr.
 *
 *--------------------------------------------------------------
 */

	/* ARGSUSED */
static void
ComputeRectOvalBbox(canvas, rectOvalPtr)
    Tk_Canvas canvas;			/* Canvas that contains item. */
    RectOvalItem *rectOvalPtr;		/* Item whose bbox is to be
					 * recomputed. */
{
    int bloat, tmp;
    double dtmp;

    /*
     * Make sure that the first coordinates are the lowest ones.
     */

    if (rectOvalPtr->bbox[1] > rectOvalPtr->bbox[3]) {
	double tmp;
	tmp = rectOvalPtr->bbox[3];
	rectOvalPtr->bbox[3] = rectOvalPtr->bbox[1];
	rectOvalPtr->bbox[1] = tmp;
    }
    if (rectOvalPtr->bbox[0] > rectOvalPtr->bbox[2]) {
	double tmp;
	tmp = rectOvalPtr->bbox[2];
	rectOvalPtr->bbox[2] = rectOvalPtr->bbox[0];
	rectOvalPtr->bbox[0] = tmp;
    }

    if (rectOvalPtr->outlineColor == NULL) {
	bloat = 0;
    } else {
	bloat = (rectOvalPtr->width+1)/2;
    }

    /*
     * Special note:  the rectangle is always drawn at least 1x1 in
     * size, so round up the upper coordinates to be at least 1 unit
     * greater than the lower ones.
     */

    tmp = (int) ((rectOvalPtr->bbox[0] >= 0) ? rectOvalPtr->bbox[0] + .5
	    : rectOvalPtr->bbox[0] - .5);
    rectOvalPtr->header.x1 = tmp - bloat;
    tmp = (int) ((rectOvalPtr->bbox[1] >= 0) ? rectOvalPtr->bbox[1] + .5
	    : rectOvalPtr->bbox[1] - .5);
    rectOvalPtr->header.y1 = tmp - bloat;
    dtmp = rectOvalPtr->bbox[2];
    if (dtmp < (rectOvalPtr->bbox[0] + 1)) {
	dtmp = rectOvalPtr->bbox[0] + 1;
    }
    tmp = (int) ((dtmp >= 0) ? dtmp + .5 : dtmp - .5);
    rectOvalPtr->header.x2 = tmp + bloat;
    dtmp = rectOvalPtr->bbox[3];
    if (dtmp < (rectOvalPtr->bbox[1] + 1)) {
	dtmp = rectOvalPtr->bbox[1] + 1;
    }
    tmp = (int) ((dtmp >= 0) ? dtmp + .5 : dtmp - .5);
    rectOvalPtr->header.y2 = tmp + bloat;
}

/*
 *--------------------------------------------------------------
 *
 * DisplayRectOval --
 *
 *	This procedure is invoked to draw a rectangle or oval
 *	item in a given drawable.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	ItemPtr is drawn in drawable using the transformation
 *	information in canvas.
 *
 *--------------------------------------------------------------
 */

static void
DisplayRectOval(canvas, itemPtr, display, drawable, x, y, width, height)
    Tk_Canvas canvas;			/* Canvas that contains item. */
    Tk_Item *itemPtr;			/* Item to be displayed. */
    Display *display;			/* Display on which to draw item. */
    Drawable drawable;			/* Pixmap or window in which to draw
					 * item. */
    int x, y, width, height;		/* Describes region of canvas that
					 * must be redisplayed (not used). */
{
    RectOvalItem *rectOvalPtr = (RectOvalItem *) itemPtr;
    short x1, y1, x2, y2;

    /*
     * Compute the screen coordinates of the bounding box for the item.
     * Make sure that the bbox is at least one pixel large, since some
     * X servers will die if it isn't.
     */

    Tk_CanvasDrawableCoords(canvas, rectOvalPtr->bbox[0], rectOvalPtr->bbox[1],
	    &x1, &y1);
    Tk_CanvasDrawableCoords(canvas, rectOvalPtr->bbox[2], rectOvalPtr->bbox[3],
	    &x2, &y2);
    if (x2 <= x1) {
	x2 = x1+1;
    }
    if (y2 <= y1) {
	y2 = y1+1;
    }

    /*
     * Display filled part first (if wanted), then outline.  If we're
     * stippling, then modify the stipple offset in the GC.  Be sure to
     * reset the offset when done, since the GC is supposed to be
     * read-only.
     */

    if (rectOvalPtr->fillGC != None) {
	if (rectOvalPtr->fillStipple != None) {
	    Tk_CanvasSetStippleOrigin(canvas, rectOvalPtr->fillGC);
	}
	if (rectOvalPtr->header.typePtr == &tkRectangleType) {
	    XFillRectangle(display, drawable, rectOvalPtr->fillGC,
		    x1, y1, (unsigned int) (x2-x1), (unsigned int) (y2-y1));
	} else {
	    XFillArc(display, drawable, rectOvalPtr->fillGC,
		    x1, y1, (unsigned) (x2-x1), (unsigned) (y2-y1),
		    0, 360*64);
	}
	if (rectOvalPtr->fillStipple != None) {
	    XSetTSOrigin(display, rectOvalPtr->fillGC, 0, 0);
	}
    }
    if (rectOvalPtr->outlineGC != None) {
	if (rectOvalPtr->header.typePtr == &tkRectangleType) {
	    XDrawRectangle(display, drawable, rectOvalPtr->outlineGC,
		    x1, y1, (unsigned) (x2-x1), (unsigned) (y2-y1));
	} else {
	    XDrawArc(display, drawable, rectOvalPtr->outlineGC,
		    x1, y1, (unsigned) (x2-x1), (unsigned) (y2-y1), 0, 360*64);
	}
    }
}

/*
 *--------------------------------------------------------------
 *
 * RectToPoint --
 *
 *	Computes the distance from a given point to a given
 *	rectangle, in canvas units.
 *
 * Results:
 *	The return value is 0 if the point whose x and y coordinates
 *	are coordPtr[0] and coordPtr[1] is inside the rectangle.  If the
 *	point isn't inside the rectangle then the return value is the
 *	distance from the point to the rectangle.  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
RectToPoint(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 *rectPtr = (RectOvalItem *) itemPtr;
    double xDiff, yDiff, x1, y1, x2, y2, inc, tmp;

    /*
     * Generate a new larger rectangle that includes the border
     * width, if there is one.
     */

    x1 = rectPtr->bbox[0];
    y1 = rectPtr->bbox[1];
    x2 = rectPtr->bbox[2];
    y2 = rectPtr->bbox[3];
    if (rectPtr->outlineGC != None) {
	inc = rectPtr->width/2.0;
	x1 -= inc;
	y1 -= inc;
	x2 += inc;
	y2 += inc;
    }

    /*
     * If the point is inside the rectangle, handle specially:
     * distance is 0 if rectangle is filled, otherwise compute
     * distance to nearest edge of rectangle and subtract width
     * of edge.
     */

    if ((pointPtr[0] >= x1) && (pointPtr[0] < x2)
		&& (pointPtr[1] >= y1) && (pointPtr[1] < y2)) {
	if ((rectPtr->fillGC != None) || (rectPtr->outlineGC == None)) {
	    return 0.0;
	}
	xDiff = pointPtr[0] - x1;
	tmp = x2 - pointPtr[0];
	if (tmp < xDiff) {
	    xDiff = tmp;
	}
	yDiff = pointPtr[1] - y1;
	tmp = y2 - pointPtr[1];
	if (tmp < yDiff) {
	    yDiff = tmp;
	}
	if (yDiff < xDiff) {
	    xDiff = yDiff;
	}
	xDiff -= rectPtr->width;
	if (xDiff < 0.0) {
	    return 0.0;
	}
	return xDiff;
    }

    /*
     * Point is outside rectangle.
     */

    if (pointPtr[0] < x1) {
	xDiff = x1 - pointPtr[0];
    } else if (pointPtr[0] > x2)  {
	xDiff = pointPtr[0] - x2;
    } else {
	xDiff = 0;
    }

    if (pointPtr[1] < y1) {
	yDiff = y1 - pointPtr[1];
    } else if (pointPtr[1] > y2)  {
	yDiff = pointPtr[1] - y2;
    } else {
	yDiff = 0;
    }

    return hypot(xDiff, yDiff);
}

/*
 *--------------------------------------------------------------
 *
 * OvalToPoint --
 *
 *	Computes the distance from a given point to a given
 *	oval, in canvas units.
 *
 * Results:
 *	The return value is 0 if the point whose x and y coordinates
 *	are coordPtr[0] and coordPtr[1] is inside the oval.  If the
 *	point isn't inside the oval then the return value is the