Hi,
Here's a patch to add a new method to COLOR4D: WithAlpha. This means
you can do this:
const COLOR4D color = getSomeColor(); //could be an argument or static const
gal.SetStrokeColor( color.WithAlpha( 0.5 ) );
Rather than:
const COLOR4D color = getSomeColor(); //could be an argument or static const
COLOR4D temp = color; //don't modify base color
color.a = 0.5;
gal.SetStrokeColor( temp );
or the shorter but less readable:
gal.SetStrokeColor( { color.r, color.g, color.b, 0.5 } );
It also uses transparent sanity checking in debug builds.
Cheers,
John
From 25566fab5dbd0ef185b995383eae1ca5b97f6c12 Mon Sep 17 00:00:00 2001
From: John Beard <john.j.be...@gmail.com>
Date: Wed, 1 Mar 2017 09:59:25 +0800
Subject: [PATCH] Add WithAlpha method to COLOR4D
This is useful for taking a "base" color and making derived colours with
the given alpha, but the same RGB value.
---
include/gal/color4d.h | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/include/gal/color4d.h b/include/gal/color4d.h
index 4e0c0f4ae..ebcf333bc 100644
--- a/include/gal/color4d.h
+++ b/include/gal/color4d.h
@@ -224,6 +224,19 @@ public:
}
/**
+ * Function WithAlpha
+ * Returns a colour with the same colour, but the given alpha
+ * @param aAlpha specifies the alpha of the new color
+ * @return COLOR4D color with that alpha
+ */
+ COLOR4D WithAlpha( double aAlpha ) const
+ {
+ assert( aAlpha >= 0.0 && aAlpha <= 1.0 );
+
+ return COLOR4D( r, g, b, aAlpha );
+ }
+
+ /**
* Function Inverted
* Returns an inverted color, alpha remains the same.
* @return COLOR4D& Inverted color.
--
2.12.0
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