Circle rasterizes a circle at center xm and ym with radius r.

FillCircle fills a circle with center at xm, ym and radius r.

FillRectangle fills a rectangle.

FloatLines draws connected lines given in floating point coordinates.

Line rasterizes a straight 1px line.

Rectangle draws a rectangle.

CoordinateSystem defines the upper left point and the lower right point of the image in floating-point coordinates.

Image implements a setter by wrapping the underlying draw.Image and color type.

A Setter can set a single pixel at x and y.