How do I interpolate four colors?
I need to interpolate four colors in my microphone renderer.
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1 color is white if the user is silent.
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2 colors if the user speaks softly.
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3 color is yellow if the user speaks normally.
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4 colors if the user speaks loudly.
Im create a Paint void to change the color, but I don't know how to interpolate these four colors, I only know how to do it with two colors. What do I need to do?
// used to take colors mix according to proportion
private int interpolateColor(final int a, final int b,
final float proportion) {
final float[] hsva = new float[3];
final float[] hsvb = new float[3];
Color.colorToHSV(a, hsva);
Color.colorToHSV(b, hsvb);
for (int i = 0; i < 3; i++) {
hsvb[i] = interpolate(hsva[i], hsvb[i], proportion);
}
return Color.HSVToColor(hsvb);
}
private float interpolate(final float a, final float b,
final float proportion) {
return (a + ((b - a) * proportion));
}
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1 answer
Assuming you've already defined the user's current "volume" in a float, where 0 is completely disabled and 1 is the maximum, then I would do something like this:
float v = userVolume();
if (v < SOFT_CUTOFF)
color = interpolateColor(SILENT_COLOR, SOFT_COLOR, v/SOFT_CUTOFF);
else if (v < NORMAL_CUTOFF)
color = interpolateColor(SOFT_COLOR, NORMAL_COLOR, (v-SOFT_CUTOFF)/(NORMAL_CUTOFF-SOFT_CUTOFF));
else
color = interpolateColor(NORMAL_COLOR, LOUD_COLOR, (v-NORMAL_CUTOFF)/(1-NORMAL_CUTOFF));
SOFT_CUTOFF and NORMAL_CUTOFF should be set to values between 0 and 1, which determine in what ratio they should be full color.
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