color from base color gradient function

1 files changed, 31 insertions, 0 deletions

diff --git a/color_gradient.m b/color_gradient.m
new file mode 100644
index 0000000..310ff99
--- /dev/null
+++ b/color_gradient.m
@@ -0,0 +1,31 @@
+function rgb= color_gradient( pos, base_color_rgb, Ncolors )
+%% returns rgb=[R,G,B] components from the brightness gradient of the base color
+% base_color_rgb - [R,G,B] of the base color
+% Ncolors - number of positions in gradient
+
+	%% color map  as gradient of particular color
+	% starting values
+	hsv_s=rgb2hsv(base_color_rgb);
+	hue_f = hsv_s(1);
+	sat_f = hsv_s(2);
+	val_f = hsv_s(3);
+	% stop values
+	hue_s = hue_f;
+	sat_s = 0;
+	val_s = 1;
+	hue=linspace(hue_s,hue_f, Ncolors);
+	sat=linspace(sat_s,sat_f, Ncolors);
+	val=linspace(val_s,val_f, Ncolors);
+	cmap =  hsv2rgb([hue', sat', val']);
+
+	%% check that pos is with in the reach
+	pos = floor(pos);
+	if( pos < 1 )
+		pos=1;
+	end
+	if( pos > Ncolors )
+		pos=Ncolors;
+	end
+
+	rgb = cmap(pos,:);
+end