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@ -2,26 +2,42 @@
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namespace kaleidoscope {
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namespace kaleidoscope {
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void LEDChaseEffect::update(void) {
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void LEDChaseEffect::update(void) {
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// Check to see if it's time to change the positions of the red and blue lights
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if (current_chase_counter++ < chase_threshold) {
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if (current_chase_counter++ < chase_threshold) {
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return;
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return;
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}
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}
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current_chase_counter = 0;
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current_chase_counter = 0;
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// The red LED is at `pos`; the blue one follows behind. `chase_sign` is either +1 or
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// -1; `chase_pixels` is the gap between them.
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byte pos2 = pos - (chase_sign * chase_pixels);
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byte pos2 = pos - (chase_sign * chase_pixels);
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// First, we turn off the LEDs that were turned on in the previous update. `pos` is
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// always in the valid range (0 <= pos < LED_COUNT), but after it changes direction, for
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// the first few updates, `pos2` will be out of bounds. Since it's an unsigned integer,
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// even when it would have a value below zero, it underflows and so one test is good for
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// both ends of the range.
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::LEDControl.setCrgbAt(pos, {0, 0, 0});
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::LEDControl.setCrgbAt(pos, {0, 0, 0});
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if (pos2 < LED_COUNT)
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if (pos2 < LED_COUNT)
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::LEDControl.setCrgbAt(pos2, {0, 0, 0});
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::LEDControl.setCrgbAt(pos2, {0, 0, 0});
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// Next, we adjust the red light's position. If the direction hasn't changed (the red
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// light isn't out of bounds), we also adjust the blue light's position to match the red
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// one. If the new position puts it out of bounds, we reverse the direction, and bring
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// it back in bounds. When this happens, the blue light "jumps" behind the red one, and
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// will be out of bounds. The simplest way to do this is to assign it a value that is
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// known to be invalid (LED_COUNT).
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pos += chase_sign;
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pos += chase_sign;
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if (! (pos < LED_COUNT)) {
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if (pos < LED_COUNT) {
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pos2 += chase_sign;
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} else {
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chase_sign = -chase_sign;
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chase_sign = -chase_sign;
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pos += chase_sign;
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pos += chase_sign;
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pos2 = LED_COUNT;
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pos2 = LED_COUNT;
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} else {
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pos2 += chase_sign;
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}
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}
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// Last, we turn on the LEDs at their new positions. As before, the blue light (pos2) is
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// only set if it's in the valid LED range.
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::LEDControl.setCrgbAt(pos, {0, 0, 255});
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::LEDControl.setCrgbAt(pos, {0, 0, 255});
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if (pos2 < LED_COUNT)
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if (pos2 < LED_COUNT)
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::LEDControl.setCrgbAt(pos2, {255, 0, 0});
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::LEDControl.setCrgbAt(pos2, {255, 0, 0});
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