完善V1.4踢乒乓球版本

v1.4 摄像头提乒乓球方案/platformio/lib/FastLED/src/fl/time_alpha.cpp

@@ -0,0 +1,108 @@
+
+#include "fl/time_alpha.h"
+#include "fl/warn.h"
+#include "math_macros.h"
+
+namespace fl {
+
+u8 time_alpha8(u32 now, u32 start, u32 end) {
+    if (now < start) {
+        return 0;
+    }
+    if (now > end) {
+        return 255;
+    }
+    u32 elapsed = now - start;
+    u32 total = end - start;
+    u32 out = (elapsed * 255) / total;
+    if (out > 255) {
+        out = 255;
+    }
+    return static_cast<u8>(out);
+}
+
+u16 time_alpha16(u32 now, u32 start, u32 end) {
+    if (now < start) {
+        return 0;
+    }
+    if (now > end) {
+        return 65535;
+    }
+    u32 elapsed = now - start;
+    u32 total = end - start;
+    u32 out = (elapsed * 65535) / total;
+    if (out > 65535) {
+        out = 65535;
+    }
+    return static_cast<u16>(out);
+}
+
+TimeRamp::TimeRamp(u32 risingTime, u32 latchMs, u32 fallingTime)
+    : mLatchMs(latchMs), mRisingTime(risingTime), mFallingTime(fallingTime) {}
+
+void TimeRamp::trigger(u32 now) {
+    mStart = now;
+    // mLastValue = 0;
+
+    mFinishedRisingTime = mStart + mRisingTime;
+    mFinishedPlateauTime = mFinishedRisingTime + mLatchMs;
+    mFinishedFallingTime = mFinishedPlateauTime + mFallingTime;
+}
+
+void TimeRamp::trigger(u32 now, u32 risingTime, u32 latchMs,
+                       u32 fallingTime) {
+    mRisingTime = risingTime;
+    mLatchMs = latchMs;
+    mFallingTime = fallingTime;
+    trigger(now);
+}
+
+bool TimeRamp::isActive(u32 now) const {
+
+    bool not_started = (mFinishedRisingTime == 0) &&
+                       (mFinishedPlateauTime == 0) &&
+                       (mFinishedFallingTime == 0);
+    if (not_started) {
+        // if we have not started, we are not active
+        return false;
+    }
+
+    if (now < mStart) {
+        // if the time is before the start, we are not active
+        return false;
+    }
+
+    if (now > mFinishedFallingTime) {
+        // if the time is after the finished rising, we are not active
+        return false;
+    }
+
+    return true;
+}
+
+u8 TimeRamp::update8(u32 now) {
+    if (!isActive(now)) {
+        return 0;
+    }
+    // u32 elapsed = now - mStart;
+    u8 out = 0;
+    if (now < mFinishedRisingTime) {
+        out = time_alpha8(now, mStart, mFinishedRisingTime);
+    } else if (now < mFinishedPlateauTime) {
+        // plateau
+        out = 255;
+    } else if (now < mFinishedFallingTime) {
+        // ramp down
+        u8 alpha =
+            time_alpha8(now, mFinishedPlateauTime, mFinishedFallingTime);
+        out = 255 - alpha;
+    } else {
+        // finished
+        out = 0;
+    }
+
+    mLastValue = out;
+    return out;
+}
+
+} // namespace fl