ColorFromHsb() public static method

public static ColorFromHsb ( double hue, double saturation, double brightness ) : Color
hue double
saturation double
brightness double
return Cairo.Color
Ejemplo n.º 1
0
        protected override bool OnExposeEvent(Gdk.EventExpose evnt)
        {
            Cairo.Context cr = Gdk.CairoHelper.Create(evnt.Window);

            double step_width  = Allocation.Width / (double)steps;
            double step_height = Allocation.Height / (double)steps;
            double h           = 1.0;
            double s           = 0.0;

            for (int xi = 0, i = 0; xi < steps; xi++)
            {
                for (int yi = 0; yi < steps; yi++, i++)
                {
                    double bg_b = (double)(i / 255.0);
                    double fg_b = 1.0 - bg_b;

                    double x = Allocation.X + xi * step_width;
                    double y = Allocation.Y + yi * step_height;

                    cr.Rectangle(x, y, step_width, step_height);
                    cr.SetSourceColor(CairoExtensions.ColorFromHsb(h, s, bg_b));
                    cr.Fill();

                    int tw, th;
                    var layout = new Pango.Layout(PangoContext);
                    layout.SetText(((int)(bg_b * 255.0)).ToString());
                    layout.GetPixelSize(out tw, out th);

                    cr.Translate(0.5, 0.5);
                    cr.MoveTo(x + (step_width - tw) / 2.0, y + (step_height - th) / 2.0);
                    cr.SetSourceColor(CairoExtensions.ColorFromHsb(h, s, fg_b));
                    PangoCairoHelper.ShowLayout(cr, layout);
                    cr.Translate(-0.5, -0.5);
                }
            }

            CairoExtensions.DisposeContext(cr);
            return(true);
        }
Ejemplo n.º 2
0
        protected override bool OnDrawn(Cairo.Context cr)
        {
            double step_width  = Allocation.Width / (double)steps;
            double step_height = Allocation.Height / (double)steps;
            double h           = 1.0;
            double s           = 0.0;

            for (int xi = 0, i = 0; xi < steps; xi++)
            {
                for (int yi = 0; yi < steps; yi++, i++)
                {
                    double bg_b = (double)(i / 255.0);
                    double fg_b = 1.0 - bg_b;

                    double x = xi * step_width;
                    double y = yi * step_height;

                    cr.Rectangle(x, y, step_width, step_height);
                    cr.Color = CairoExtensions.ColorFromHsb(h, s, bg_b);
                    cr.Fill();

                    int          tw, th;
                    Pango.Layout layout = new Pango.Layout(PangoContext);
                    layout.SetText(((int)(bg_b * 255.0)).ToString());
                    layout.GetPixelSize(out tw, out th);

                    cr.Translate(0.5, 0.5);
                    cr.MoveTo(x + (step_width - tw) / 2.0, y + (step_height - th) / 2.0);
                    cr.Color = CairoExtensions.ColorFromHsb(h, s, fg_b);
                    PangoCairoHelper.ShowLayout(cr, layout);
                    cr.Translate(-0.5, -0.5);
                }
            }

            return(true);
        }