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Add HSV helpers to AddressableLED (#2135)

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Also change the setLED() method to setRGB() for consistency and clarity.

Add rainbow example to demonstrate HSV usage.
This commit is contained in:
Austin Shalit
2019-11-29 15:16:57 -08:00
committed by Peter Johnson
parent 5e97c81d80
commit f66ae59992
6 changed files with 202 additions and 45 deletions
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52
wpilibj/src/main/java/edu/wpi/first/wpilibj/AddressableLEDBuffer.java
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@@ -26,18 +26,62 @@ public class AddressableLEDBuffer {
* Sets a specific led in the buffer.
*
* @param index the index to write
* @param r the r value
* @param g the g value
* @param b the b value
* @param r the r value [0-255]
* @param g the g value [0-255]
* @param b the b value [0-255]
*/
@SuppressWarnings("ParameterName")
public void setLED(int index, int r, int g, int b) {
public void setRGB(int index, int r, int g, int b) {
m_buffer[index * 4] = (byte) b;
m_buffer[(index * 4) + 1] = (byte) g;
m_buffer[(index * 4) + 2] = (byte) r;
m_buffer[(index * 4) + 3] = 0;
}
/**
* Sets a specific led in the buffer.
*
* @param index the index to write
* @param h the h value [0-180]
* @param s the s value [0-255]
* @param v the v value [0-255]
*/
@SuppressWarnings("ParameterName")
public void setHSV(final int index, final int h, final int s, final int v) {
if (s == 0) {
setRGB(index, v, v, v);
return;
}
final int region = h / 30;
final int remainder = (h - (region * 30)) * 6;
final int p = (v * (255 - s)) >> 8;
final int q = (v * (255 - ((s * remainder) >> 8))) >> 8;
final int t = (v * (255 - ((s * (255 - remainder)) >> 8))) >> 8;
switch (region) {
case 0:
setRGB(index, v, t, p);
break;
case 1:
setRGB(index, q, v, p);
break;
case 2:
setRGB(index, p, v, t);
break;
case 3:
setRGB(index, p, q, v);
break;
case 4:
setRGB(index, t, p, v);
break;
default:
setRGB(index, v, p, q);
break;
}
}
/**
* Gets the buffer length.
*