extern public static int XFillPolygon (IntPtr display, XDrawable drawable, IntPtr gc, XPoint[] points, int npoints, int shape, int mode);
extern public static int XDrawPoints (IntPtr display, XDrawable drawable, IntPtr gc, XPoint[] points, int npoints, int mode);
extern public static IntPtr XPolygonRegion (XPoint[] points, int n, int fill_rule);
/// <summary>
/// <para>Construct a new <see cref="T:Xsharp.Region"/>
/// instance that is initially set to a polygon.</para>
/// </summary>
///
/// <param name="points">
/// <para>An array of points that defines the polygon.</para>
/// </param>
///
/// <param name="fillRule">
/// <para>The area fill rule to use for the polygon.</para>
/// </param>
///
/// <exception cref="T:System.ArgumentNullException">
/// <para>Raised if <paramref name="points"/> is <see langword="null"/>.
/// </para>
/// </exception>
///
/// <exception cref="T:System.ArgumentOutOfRangeException">
/// <para>Raised if <paramref name="points"/> has less than 3
/// elements.</para>
/// </exception>
///
/// <exception cref="T:Xsharp.XException">
/// <para>Raised if any of the elements in <paramref name="points"/>
/// has co-ordinates that are out of range, or if
/// <paramref name="fillRule"/> is invalid.</para>
/// </exception>
public Region(Point[] points, FillRule fillRule)
{
// Validate the parameters.
if(points == null)
{
throw new ArgumentNullException("points");
}
else if(points.Length < 3)
{
throw new ArgumentOutOfRangeException
("points", S._("X_PolygonNeeds3Pts"));
}
// Convert "points" into an "XPoint[]" array.
XPoint[] pts = new XPoint [points.Length];
try
{
checked
{
for(int index = 0; index < points.Length; ++index)
{
pts[index].x = (short)(points[index].x);
pts[index].y = (short)(points[index].y);
}
}
}
catch(OverflowException)
{
throw new XException(S._("X_PointCoordRange"));
}
// Validate the fill rule.
if(fillRule != FillRule.EvenOddRule &&
fillRule != FillRule.WindingRule)
{
throw new XException
(String.Format(S._("X_FillRule"), (int)fillRule));
}
// Create the polygon region.
lock(typeof(Region))
{
region = Xlib.XPolygonRegion(pts, pts.Length,
(int)fillRule);
if(region == IntPtr.Zero)
{
Display.OutOfMemory();
}
}
}
/// <summary>
/// <para>Draw an arc, with lines joining to the center.</para>
/// </summary>
///
/// <param name="x">
/// <para>The X co-ordinate of the top-left point of
/// the arc's bounding rectangle.</para>
/// </param>
///
/// <param name="y">
/// <para>The Y co-ordinate of the top-left point of
/// the arc's bounding rectangle.</para>
/// </param>
///
/// <param name="width">
/// <para>The width of the arc's bounding rectangle. The pixel at
/// <i>x + width - 1</i> is the right-most side of the rectangle.</para>
/// </param>
///
/// <param name="height">
/// <para>The height of the arc's bounding rectangle. The pixel at
/// <i>y + height - 1</i> is the bottom-most side of the rectangle.</para>
/// </param>
///
/// <param name="startAngle">
/// <para>The starting angle for the arc, in degrees.</para>
/// </param>
///
/// <param name="sweepAngle">
/// <para>The sweep angle for the arc, in degrees.</para>
/// </param>
///
/// <exception cref="T:Xsharp.XException">
/// <para>One of the co-ordinate or size values is out of range.</para>
/// </exception>
public void DrawPie(int x, int y, int width, int height,
float startAngle, float sweepAngle)
{
if(x < -32768 || x > 32767 || width < -32768 || width > 32767 ||
y < -32768 || y > 32767 || height < -32768 || height > 32767)
{
throw new XException(S._("X_RectCoordRange"));
}
if(width > 0 && height > 0)
{
try
{
// Draw the arc portion.
IntPtr display = Lock();
Xlib.XDrawArc(display, drawableHandle, gc,
x, y, width, height,
(int)(startAngle * 64.0f),
(int)(sweepAngle * 64.0f));
#if CONFIG_EXTENDED_NUMERICS
// Calculate the location of the arc end-points
// and then draw the connecting arc pie lines.
XPoint[] xpoints = new XPoint [3];
int xaxis = width / 2;
int yaxis = height / 2;
int xmiddle = x + xaxis;
int ymiddle = y + yaxis;
double radians = startAngle * Math.PI / 180.0;
xpoints[0].x =
(short)(xmiddle + Math.Cos(radians) * xaxis);
xpoints[0].y =
(short)(ymiddle - Math.Sin(radians) * yaxis);
xpoints[1].x = (short)xmiddle;
xpoints[1].y = (short)ymiddle;
radians = (startAngle + sweepAngle) * Math.PI / 180.0;
xpoints[2].x =
(short)(xmiddle + Math.Cos(radians) * xaxis);
xpoints[2].y =
(short)(ymiddle - Math.Sin(radians) * yaxis);
Xlib.XDrawLines(display, drawableHandle, gc, xpoints,
3, 0 /* CoordModeOrigin */);
#endif
}
finally
{
dpy.Unlock();
}
}
}
/// <summary>
/// <para>Draw a list of points.</para>
/// </summary>
///
/// <param name="points">
/// <para>An array of points to be drawn.</para>
/// </param>
///
/// <exception cref="T:System.ArgumentNullException">
/// <para>Raised if <paramref name="points"/> is <see langword="null"/>.
/// </para>
/// </exception>
///
/// <exception cref="T:Xsharp.XException">
/// <para>One of the co-ordinate values is out of range, or
/// <paramref name="points"/> has less than 1 element.</para>
/// </exception>
public void DrawPoints(Point[] points)
{
int len;
// Validate the parameter.
if(points == null)
{
throw new ArgumentNullException("points");
}
len = points.Length;
if(len < 1)
{
throw new XException(S._("X_Need1Point"));
}
else if(len > (dpy.MaxRequestSize() - 3))
{
throw new XException(S._("X_MaxReqSizeExceeded"));
}
// Convert the "Point" array into an "XPoint" array.
XPoint[] xpoints = new XPoint [len];
int pt;
for(pt = 0; pt < len; ++pt)
{
xpoints[pt] = new XPoint(points[pt].x, points[pt].y);
}
// Draw the points.
try
{
IntPtr display = Lock();
Xlib.XDrawPoints(display, drawableHandle, gc, xpoints,
len, 0 /* CoordModeOrigin */);
}
finally
{
dpy.Unlock();
}
}
