Cairo-Chart/src/Line.vala

namespace CairoChart {

	/**
	 * Line Style.
	 */
	public struct LineStyle {

		/**
		 * Line color.
		 */
		Color color;

		/**
		 * A line width.
		 */
		double width;

		/**
		 * An array specifying alternate lengths of on and off stroke portions.
		 */
		double[]? dashes;

		/**
		 * An offset into the dash pattern at which the stroke should start.
		 */
		double dash_offset;
		/**
		 * A line join style.
		 */
		Cairo.LineJoin join;

		/**
		 * A line cap style.
		 */
		Cairo.LineCap cap;

		/**
		 * Constructs a new ``LineStyle``.
		 * @param color line color.
		 * @param width a line width.
		 * @param dashes an array specifying alternate lengths of on and off stroke portions.
		 * @param dash_offset an offset into the dash pattern at which the stroke should start.
		 * @param join a line join style.
		 * @param cap a line cap style.
		 */
		public LineStyle (Color color = Color(),
		                  double width = 1,
		                  double[]? dashes = null,
		                  double dash_offset = 0,
		                  Cairo.LineJoin join = Cairo.LineJoin.MITER,
		                  Cairo.LineCap cap = Cairo.LineCap.ROUND
		) {
			this.color = color;
			this.width = width;
			this.dashes = dashes;
			this.dash_offset = dash_offset;
			this.join = join;
			this.cap = cap;
		}

		/**
		 * Applies current style to the {@link Chart} ``Context``.
		 */
		public void apply (Chart chart) {
			chart.color = color;
			chart.ctx.set_line_width(width);
			chart.ctx.set_dash(dashes, dash_offset);
			chart.ctx.set_line_join(join);
			chart.ctx.set_line_cap(cap);
		}
	}
}