tkwindraw.c

linux系统下的音频通信

    }
    DeleteObject(SelectObject(dc, oldBrush));
}

/*
 *----------------------------------------------------------------------
 *
 * XDrawLines --
 *
 *	Draw connected lines.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Renders a series of connected lines.
 *
 *----------------------------------------------------------------------
 */

void
XDrawLines(display, d, gc, points, npoints, mode)
    Display* display;
    Drawable d;
    GC gc;
    XPoint* points;
    int npoints;
    int mode;
{
    HPEN pen;
    TkWinDCState state;
    HDC dc;
    
    if (d == None) {
	return;
    }

    dc = TkWinGetDrawableDC(display, d, &state);

    if (!tkpIsWin32s && (gc->line_width > 1)) {
	LOGBRUSH lb;
	DWORD style;

	lb.lbStyle = BS_SOLID;
	lb.lbColor = gc->foreground;
	lb.lbHatch = 0;

	style = PS_GEOMETRIC|PS_COSMETIC;
	switch (gc->cap_style) {
	    case CapNotLast:
	    case CapButt:
		style |= PS_ENDCAP_FLAT; 
		break;
	    case CapRound:
		style |= PS_ENDCAP_ROUND; 
		break;
	    default:
		style |= PS_ENDCAP_SQUARE; 
		break;
	}
	switch (gc->join_style) {
	    case JoinMiter: 
		style |= PS_JOIN_MITER; 
		break;
	    case JoinRound:
		style |= PS_JOIN_ROUND; 
		break;
	    default:
		style |= PS_JOIN_BEVEL; 
		break;
	}
	pen = ExtCreatePen(style, gc->line_width, &lb, 0, NULL);
    } else {
	pen = CreatePen(PS_SOLID, gc->line_width, gc->foreground);
    }
    RenderObject(dc, gc, points, npoints, mode, pen, Polyline);
    DeleteObject(pen);
    
    TkWinReleaseDrawableDC(d, dc, &state);
}

/*
 *----------------------------------------------------------------------
 *
 * XFillPolygon --
 *
 *	Draws a filled polygon.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Draws a filled polygon on the specified drawable.
 *
 *----------------------------------------------------------------------
 */

void
XFillPolygon(display, d, gc, points, npoints, shape, mode)
    Display* display;
    Drawable d;
    GC gc;
    XPoint* points;
    int npoints;
    int shape;
    int mode;
{
    HPEN pen;
    TkWinDCState state;
    HDC dc;

    if (d == None) {
	return;
    }

    dc = TkWinGetDrawableDC(display, d, &state);

    pen = GetStockObject(NULL_PEN);
    RenderObject(dc, gc, points, npoints, mode, pen, Polygon);

    TkWinReleaseDrawableDC(d, dc, &state);
}

/*
 *----------------------------------------------------------------------
 *
 * XDrawRectangle --
 *
 *	Draws a rectangle.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Draws a rectangle on the specified drawable.
 *
 *----------------------------------------------------------------------
 */

void
XDrawRectangle(display, d, gc, x, y, width, height)
    Display* display;
    Drawable d;
    GC gc;
    int x;
    int y;
    unsigned int width;
    unsigned int height;
{
    HPEN pen, oldPen;
    TkWinDCState state;
    HBRUSH oldBrush;
    HDC dc;

    if (d == None) {
	return;
    }

    dc = TkWinGetDrawableDC(display, d, &state);

    pen = CreatePen(PS_SOLID, gc->line_width, gc->foreground);
    oldPen = SelectObject(dc, pen);
    oldBrush = SelectObject(dc, GetStockObject(NULL_BRUSH));
    SetROP2(dc, tkpWinRopModes[gc->function]);

    Rectangle(dc, x, y, x+width+1, y+height+1);

    DeleteObject(SelectObject(dc, oldPen));
    SelectObject(dc, oldBrush);
    TkWinReleaseDrawableDC(d, dc, &state);
}

/*
 *----------------------------------------------------------------------
 *
 * XDrawArc --
 *
 *	Draw an arc.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Draws an arc on the specified drawable.
 *
 *----------------------------------------------------------------------
 */

void
XDrawArc(display, d, gc, x, y, width, height, start, extent)
    Display* display;
    Drawable d;
    GC gc;
    int x;
    int y;
    unsigned int width;
    unsigned int height;
    int start;
    int extent;
{
    display->request++;

    DrawOrFillArc(display, d, gc, x, y, width, height, start, extent, 0);
}

/*
 *----------------------------------------------------------------------
 *
 * XFillArc --
 *
 *	Draw a filled arc.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Draws a filled arc on the specified drawable.
 *
 *----------------------------------------------------------------------
 */

void
XFillArc(display, d, gc, x, y, width, height, start, extent)
    Display* display;
    Drawable d;
    GC gc;
    int x;
    int y;
    unsigned int width;
    unsigned int height;
    int start;
    int extent;
{
    display->request++;

    DrawOrFillArc(display, d, gc, x, y, width, height, start, extent, 1);
}

/*
 *----------------------------------------------------------------------
 *
 * DrawOrFillArc --
 *
 *	This procedure handles the rendering of drawn or filled
 *	arcs and chords.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Renders the requested arc.
 *
 *----------------------------------------------------------------------
 */

static void
DrawOrFillArc(display, d, gc, x, y, width, height, start, extent, fill)
    Display *display;
    Drawable d;
    GC gc;
    int x, y;			/* left top */
    unsigned int width, height;
    int start;			/* start: three-o'clock (deg*64) */
    int extent;			/* extent: relative (deg*64) */
    int fill;			/* ==0 draw, !=0 fill */
{
    HDC dc;
    HBRUSH brush, oldBrush;
    HPEN pen, oldPen;
    TkWinDCState state;
    int clockwise = (extent < 0); /* non-zero if clockwise */
    int xstart, ystart, xend, yend;
    double radian_start, radian_end, xr, yr;

    if (d == None) {
	return;
    }

    dc = TkWinGetDrawableDC(display, d, &state);

    SetROP2(dc, tkpWinRopModes[gc->function]);

    /*
     * Compute the absolute starting and ending angles in normalized radians.
     * Swap the start and end if drawing clockwise.
     */

    start = start % (64*360);
    if (start < 0) {
	start += (64*360);
    }
    extent = (start+extent) % (64*360);
    if (extent < 0) {
	extent += (64*360);
    }
    if (clockwise) {
	int tmp = start;
	start = extent;
	extent = tmp;
    }
    radian_start = XAngleToRadians(start);
    radian_end = XAngleToRadians(extent);

    /*
     * Now compute points on the radial lines that define the starting and
     * ending angles.  Be sure to take into account that the y-coordinate
     * system is inverted.
     */

    xr = x + width / 2.0;
    yr = y + height / 2.0;
    xstart = (int)((xr + cos(radian_start)*width/2.0) + 0.5);
    ystart = (int)((yr + sin(-radian_start)*height/2.0) + 0.5);
    xend = (int)((xr + cos(radian_end)*width/2.0) + 0.5);
    yend = (int)((yr + sin(-radian_end)*height/2.0) + 0.5);

    /*
     * Now draw a filled or open figure.  Note that we have to
     * increase the size of the bounding box by one to account for the
     * difference in pixel definitions between X and Windows.
     */

    pen = CreatePen(PS_SOLID, gc->line_width, gc->foreground);
    oldPen = SelectObject(dc, pen);
    if (!fill) {
	/*
	 * Note that this call will leave a gap of one pixel at the
	 * end of the arc for thin arcs.  We can't use ArcTo because
	 * it's only supported under Windows NT.
	 */

	Arc(dc, x, y, x+width+1, y+height+1, xstart, ystart, xend, yend);
    } else {
	brush = CreateSolidBrush(gc->foreground);
	oldBrush = SelectObject(dc, brush);
	if (gc->arc_mode == ArcChord) {
	    Chord(dc, x, y, x+width+1, y+height+1, xstart, ystart, xend, yend);
	} else if ( gc->arc_mode == ArcPieSlice ) {
	    Pie(dc, x, y, x+width+1, y+height+1, xstart, ystart, xend, yend);
	}
	DeleteObject(SelectObject(dc, oldBrush));
    }
    DeleteObject(SelectObject(dc, oldPen));
    TkWinReleaseDrawableDC(d, dc, &state);
}

/*
 *----------------------------------------------------------------------
 *
 * TkScrollWindow --
 *
 *	Scroll a rectangle of the specified window and accumulate
 *	a damage region.
 *
 * Results:
 *	Returns 0 if the scroll genereated no additional damage.
 *	Otherwise, sets the region that needs to be repainted after
 *	scrolling and returns 1.
 *
 * Side effects:
 *	Scrolls the bits in the window.
 *
 *----------------------------------------------------------------------
 */

int
TkScrollWindow(tkwin, gc, x, y, width, height, dx, dy, damageRgn)
    Tk_Window tkwin;		/* The window to be scrolled. */
    GC gc;			/* GC for window to be scrolled. */
    int x, y, width, height;	/* Position rectangle to be scrolled. */
    int dx, dy;			/* Distance rectangle should be moved. */
    TkRegion damageRgn;		/* Region to accumulate damage in. */
{
    HWND hwnd = TkWinGetHWND(Tk_WindowId(tkwin));
    RECT scrollRect;

    scrollRect.left = x;
    scrollRect.top = y;
    scrollRect.right = x + width;
    scrollRect.bottom = y + height;
    return (ScrollWindowEx(hwnd, dx, dy, &scrollRect, NULL, (HRGN) damageRgn,
	    NULL, 0) == NULLREGION) ? 0 : 1;
}

/*
 *----------------------------------------------------------------------
 *
 * TkWinFillRect --
 *
 *	This routine fills a rectangle with the foreground color
 *	from the specified GC ignoring all other GC values.  This
 *	is the fastest way to fill a drawable with a solid color.
 *
 * Results:
 *	None.
 *
 * Side effects:
 *	Modifies the contents of the DC drawing surface.
 *
 *----------------------------------------------------------------------
 */

void
TkWinFillRect(dc, x, y, width, height, pixel)
    HDC dc;
    int x, y, width, height;
    int pixel;
{
    RECT rect;
    COLORREF oldColor;

    rect.left = x;
    rect.top = y;
    rect.right = x + width;
    rect.bottom = y + height;
    oldColor = SetBkColor(dc, (COLORREF)pixel);
    SetBkMode(dc, OPAQUE);
    ExtTextOut(dc, 0, 0, ETO_OPAQUE, &rect, NULL, 0, NULL);
    SetBkColor(dc, oldColor);
}