[DSL] Expose ColorUtil methods to DSL rules

[lolodomo]

Fix #3743

Signed-off-by: Laurent Garnier [email protected]

[lolodomo]

With the following rule:

rule "ColorItem Changes"
when
	Item TestColor changed
then
	val hsbValue = TestColor.state as HSBType
	val rgb = hsbToRgb(hsbValue)
	logInfo("TestColor", "RGB: {},{},{}", rgb.get(0), rgb.get(1), rgb.get(2))
end

here is the result when I select color with the color picker:

21:31:25.729 [INFO ] [openhab.event.ItemCommandEvent       ] - Item 'TestColor' received command 137,57,100
21:31:25.736 [INFO ] [openhab.event.ItemStateChangedEvent  ] - Item 'TestColor' changed from 0,0,100 to 137,57,100
21:31:25.794 [INFO ] [g.openhab.core.model.script.TestColor] - RGB: 110,255,151
21:31:28.775 [INFO ] [openhab.event.ItemCommandEvent       ] - Item 'TestColor' received command 244,70,100
21:31:28.791 [INFO ] [openhab.event.ItemStateChangedEvent  ] - Item 'TestColor' changed from 137,57,100 to 244,70,100
21:31:28.791 [INFO ] [g.openhab.core.model.script.TestColor] - RGB: 88,77,255
21:31:31.354 [INFO ] [openhab.event.ItemCommandEvent       ] - Item 'TestColor' received command 346,31,100
21:31:31.367 [INFO ] [g.openhab.core.model.script.TestColor] - RGB: 255,176,194
21:31:31.366 [INFO ] [openhab.event.ItemStateChangedEvent  ] - Item 'TestColor' changed from 244,70,100 to 346,31,100

[lolodomo]

Once merged, I will create a PR to enhance the openHAB documentation.

[jsetton]

Any chance this PR gets merged?

[kaikreuzer]

lgtm, thanks!