/**
* Constructs a new Pattern that can be used to draw an SVG style radial gradient. Before using
* the pattern, at least two color stops must be added.
*
* <p>This operation requires the operating system's advanced graphics subsystem which may not be
* available on some platforms.
*
* @param device the device on which to allocate the pattern
* @param cx the x coordinate of the center of the largest (i.e., outermost) circle for the radial
* gradient. The gradient will be drawn such that the 100% gradient stop is mapped to the
* perimeter of this largest (i.e., outermost) circle.
* @param cy the y coordinate of the center of the largest (i.e., outermost) circle
* @param fx the x coordinate of the focal point for the radial gradient. The gradient will be
* drawn such that the 0% gradient stop is mapped to (fx, fy).
* @param fy the y coordinate of the focal point
* @param r the radius of the largest (i.e., outermost) circle
* @exception SWTException
* <ul>
* <li>ERROR_NO_GRAPHICS_LIBRARY - if advanced graphics are not available
* </ul>
*
* @see #addStop(Color, float)
* @see #addStop(Color, float, int)
* @since ???
*/
public Pattern(Device device, float cx, float cy, float fx, float fy, float r) {
super(device);
this.device.checkCairo();
handle = Cairo.cairo_pattern_create_radial(fx, fy, 0, cx, cy, r);
Cairo.cairo_pattern_set_extend(handle, Cairo.CAIRO_EXTEND_PAD);
init();
}
