FrameBufferEllipse

Syntax
	int FrameBufferEllipse(`struct FrameBuffer` ptr, `struct FrameBufferMatrix` matrix, int x,int y,int w,int h, int fill,unsigned int color,unsigned char m, int width, `struct FrameBufferDash` dash, `struct FrameBufferClip` clip);
Header
	base/rfbuffer.h
Library
	rfbuf
Description
	The `FrameBufferEllipse` function plots an ellipse. The argument ptr is a pointer to the frame buffer. The argument matrix is an optional transformation matrix that can be applied to the ellipse. If this is set to a `NULL` pointer then no transformation is applied. The position of the center of the ellipse is given by the arguments x, and y. The horizontal and vertical radii are given by the arguments w and h. If the argument fill is set to a non-zero value then the ellipse will be plotted as a solid shape, not an outline. The color used to plot the rectangle is given by the color which is a 32-bit number that represents the alpha,red,green and blue components of the color as 8-bit number. The alpha channel occupies the most significant bits and the blue channel occupies the least significant bits. The argument m defines which color channels are active. Setting this argument to (0x0f) will output the color to all four channels. The most significant bit controls the alpha channel and the least significant bit controls the blue channel. The width of the line used to plot the ellipse is controlled using the argument width, a value of zero will plot a hairline. The dot-dash pattern used to plot the ellipse is given by dash. If this is set to a `NULL` pointer, a solid line is plotted. The clipping polygon is given by the argument clip. If this is set to a `NULL` pointer, no clipping is performed.
Returns
	Returns zero on success. On error, a (-1) is returned.
Errors
	On error, a (-1) is returned.
Example
	None