Would ColorRGBA interpolation interest anyone?

madjack · March 29, 2013, 10:26am

Nothing extremely hardcore, but just made that one based off the Vector3f interpolation.

[java]

This patch file was generated by NetBeans IDE

It uses platform neutral UTF-8 encoding and \n newlines.

— Base (BASE)
+++ Locally Modified (Based On LOCAL)
@@ -584,6 +584,56 @@
}

/**

* Linear color interpolation from startColor to endColor by the given percent

* while ignoring the alpha value of the color.

```
* 
```

* Basically: ((1 - percent) * startColor) + (percent * endColor)

```
*
```
```
* @param scale
```

*            scale value to use. if 1, use endColor, if 0, use startColor.

```
* @param startColor
```
```
*            Begining color. 0% of f
```
```
* @param endColor
```
```
*            ending color. 100% of f
```

* @param store a ColorRGBA to store the result in.

* @return The interpolated value between startColor and endColor.

```
*/
```
public static ColorRGBA interpolateColorsLinear(float scale, ColorRGBA startColor, ColorRGBA endColor, ColorRGBA store) {
```
   if (store == null) {
```
```
       store = new ColorRGBA();
```
```
   }
```

   store.r = FastMath.interpolateLinear(scale, startColor.r, endColor.r);

   store.g = FastMath.interpolateLinear(scale, startColor.g, endColor.g);

   store.b = FastMath.interpolateLinear(scale, startColor.b, endColor.b);

```
   return store;
```
}
/**

* Linear interpolation from startColor to endColor by the given percent

```
* including the colors' alpha value.
```

* Basically: ((1 - percent) * startColor) + (percent * endColor)

```
*
```
```
* @param scale
```

*            scale color value to use. if 1, use endColor, if 0, use startColor.

```
* @param startColor
```
```
*            Begining color. 0% of f
```
```
* @param endColor
```
```
*            ending color. 100% of f
```

* @param store a ColorRGBA to store the result in.

* @return The interpolated value between startColor and endColor.

```
*/
```
public static ColorRGBA interpolateColorsAndAlphaLinear(float scale, ColorRGBA startColor, ColorRGBA endColor, ColorRGBA store) {
```
   if (store == null) {
```
```
       store = new ColorRGBA();
```
```
   }
```

   store.r = FastMath.interpolateLinear(scale, startColor.r, endColor.r);

   store.g = FastMath.interpolateLinear(scale, startColor.g, endColor.g);

   store.b = FastMath.interpolateLinear(scale, startColor.b, endColor.b);

   store.a = FastMath.interpolateLinear(scale, startColor.a, endColor.a);

```
   return store;
```
}
/**
- Transform this ColorRGBA to a Vector4f using
- x = r, y = g, z = b, w = a.
- This method is useful to use for shaders assignment.
  [/java]

kwando · March 29, 2013, 11:18am

AFAIK there is already methods for interpolation on the ColorRGBA object =)

pspeed · March 29, 2013, 11:34am

@kwando said: AFAIK there is already methods for interpolation on the ColorRGBA object =)

Yep:
http://hub.jmonkeyengine.org/javadoc/com/jme3/math/ColorRGBA.html#interpolate(com.jme3.math.ColorRGBA,%20float)
http://hub.jmonkeyengine.org/javadoc/com/jme3/math/ColorRGBA.html#interpolate(com.jme3.math.ColorRGBA,%20com.jme3.math.ColorRGBA,%20float)

madjack · March 30, 2013, 12:13am

I guess that’s what happens when you pull a 12 hours. XD

madjack · March 30, 2013, 12:56am

I guess I was thrown off by the fact that none of those are static, as one would expect these I guess.

I added an interpolation without the alpha.

[java]
public void interpolateNoAlpha(ColorRGBA beginColor, ColorRGBA finalColor, float changeAmnt) {
this.r = (1 - changeAmnt) * beginColor.r + changeAmnt * finalColor.r;
this.g = (1 - changeAmnt) * beginColor.g + changeAmnt * finalColor.g;
this.b = (1 - changeAmnt) * beginColor.b + changeAmnt * finalColor.b;
}
[/java]