Merge pull request #97 from Makuna/RotateAndShift

RotateAndShift

examples/NeoPixelRotateLoop/NeoPixelRotateLoop.ino

@@ -0,0 +1,96 @@
+// NeoPixelFunLoop
+// This example will move a trail of light around a series of pixels.  
+// A ring formation of pixels looks best.  
+// The trail will have a slowly fading tail.
+// 
+// This will demonstrate the use of the RotateRight method.
+//
+
+#include <NeoPixelBus.h>
+#include <NeoPixelAnimator.h>
+
+
+const uint16_t PixelCount = 16; // make sure to set this to the number of pixels in your strip
+const uint16_t PixelPin = 2;  // make sure to set this to the correct pin, ignored for Esp8266
+const uint16_t AnimCount = 1; // we only need one
+const uint16_t TailLength = 6; // length of the tail, must be shorter than PixelCount
+const float MaxLightness = 0.4f; // max lightness at the head of the tail (0.5f is full bright)
+
+NeoGamma<NeoGammaTableMethod> colorGamma; // for any fade animations, best to correct gamma
+
+NeoPixelBus<NeoGrbFeature, Neo800KbpsMethod> strip(PixelCount, PixelPin);
+//NeoPixelBus<NeoGrbwFeature, Neo800KbpsMethod> strip(PixelCount, PixelPin);
+
+NeoPixelAnimator animations(AnimCount); // NeoPixel animation management object
+
+void SetRandomSeed()
+{
+    uint32_t seed;
+
+    // random works best with a seed that can use 31 bits
+    // analogRead on a unconnected pin tends toward less than four bits
+    seed = analogRead(0);
+    delay(1);
+
+    for (int shifts = 3; shifts < 31; shifts += 3)
+    {
+        seed ^= analogRead(0) << shifts;
+        delay(1);
+    }
+
+    // Serial.println(seed);
+    randomSeed(seed);
+}
+
+void LoopAnimUpdate(const AnimationParam& param)
+{
+    // wait for this animation to complete,
+    // we are using it as a timer of sorts
+    if (param.state == AnimationState_Completed)
+    {
+        // done, time to restart this position tracking animation/timer
+        animations.RestartAnimation(param.index);
+
+        // rotate the complete strip one pixel to the right on every update
+        strip.RotateRight(1);
+    }
+}
+
+void DrawTailPixels()
+{
+    // using Hsl as it makes it easy to pick from similiar saturated colors
+    float hue = random(360) / 360.0f;
+    for (uint16_t index = 0; index < strip.PixelCount() && index <= TailLength; index++)
+    {
+        float lightness = index * MaxLightness / TailLength;
+        RgbColor color = HslColor(hue, 1.0f, lightness);
+
+        strip.SetPixelColor(index, colorGamma.Correct(color));
+    }
+}
+
+void setup()
+{
+    strip.Begin();
+    strip.Show();
+
+    SetRandomSeed();
+
+    // Draw the tail that will be rotated through all the rest of the pixels
+    DrawTailPixels();
+
+    // we use the index 0 animation to time how often we rotate all the pixels
+    animations.StartAnimation(0, 66, LoopAnimUpdate); 
+}
+
+
+void loop()
+{
+    // this is all that is needed to keep it running
+    // and avoiding using delay() is always a good thing for
+    // any timing related routines
+    animations.UpdateAnimations();
+    strip.Show();
+}
+
+

keywords.txt

@@ -13,9 +13,11 @@ HslColor	KEYWORD1
 HsbColor	KEYWORD1
 HtmlColor	KEYWORD1
 NeoGrbFeature	KEYWORD1
+NeoGrbwFeature	KEYWORD1
 NeoRgbwFeature	KEYWORD1
 NeoRgbFeature	KEYWORD1
 NeoBrgFeature	KEYWORD1
+NeoRbgFeature	KEYWORD1
 Neo800KbpsMethod	KEYWORD1
 Neo400KbpsMethod	KEYWORD1
 NeoAvr800KbpsMethod	KEYWORD1
@@ -66,6 +68,10 @@ Begin	KEYWORD2
 Show	KEYWORD2
 CanShow	KEYWORD2
 ClearTo	KEYWORD2
+RotateLeft	KEYWORD2
+ShiftLeft	KEYWORD2
+RotateRight	KEYWORD2
+ShiftRight	KEYWORD2
 IsDirty	KEYWORD2
 Dirty	KEYWORD2
 ResetDirty	KEYWORD2

library.properties

@@ -1,5 +1,5 @@
 name=NeoPixelBus by Makuna
-version=2.0.8
+version=2.0.9
 author=Michael C. Miller (makuna@live.com)
 maintainer=Michael C. Miller (makuna@live.com)
 sentence=A library that makes controlling NeoPixels (WS2811, WS2812 & SK6812) easy.

src/NeoPixelBus.h

@@ -160,14 +160,150 @@ public:
 
     void ClearTo(typename T_COLOR_FEATURE::ColorObject color)
     {
+        uint8_t temp[T_COLOR_FEATURE::PixelSize]; 
+
+        T_COLOR_FEATURE::applyPixelColor(temp, 0, color);
+
         uint8_t* pixels = _method.getPixels();
-        for (uint16_t n = 0; n < _countPixels; n++)
+        uint8_t* pFirst = T_COLOR_FEATURE::getPixelAddress(pixels, 0);
+        uint8_t* pLast = T_COLOR_FEATURE::getPixelAddress(pixels, _countPixels);
+        uint8_t* pFront = temp;
+        while (pFirst < pLast)
         {
-            T_COLOR_FEATURE::applyPixelColor(pixels, n, color);
+            T_COLOR_FEATURE::copyIncPixel(pFirst, pFront);
         }
+
         Dirty();
     };
 
+    void RotateLeft(uint16_t rotationCount, uint16_t first = 0, uint16_t last = 0xffff)
+    {
+        if (last >= _countPixels)
+        {
+            last = _countPixels - 1;
+        }
+
+        if (first < _countPixels &&
+            last < _countPixels &&
+            first < last &&
+            (last - first) >= rotationCount)
+        {
+
+            // store in temp
+            uint8_t temp[rotationCount * T_COLOR_FEATURE::PixelSize];
+            uint8_t* pixels = _method.getPixels();
+            uint8_t* pFirst = T_COLOR_FEATURE::getPixelAddress(temp, 0);
+            uint8_t* pLast = T_COLOR_FEATURE::getPixelAddress(temp, rotationCount - 1);
+            uint8_t* pFront = T_COLOR_FEATURE::getPixelAddress(pixels, first);
+            while (pFirst <= pLast)
+            {
+                T_COLOR_FEATURE::moveIncPixel(pFirst, pFront);
+            }
+
+            // shift data
+            ShiftLeft(rotationCount, first, last);
+
+            // move temp back
+            pFirst = T_COLOR_FEATURE::getPixelAddress(temp, 0);
+            pFront = T_COLOR_FEATURE::getPixelAddress(pixels, last - (rotationCount - 1));
+            while (pFirst <= pLast)
+            {
+                T_COLOR_FEATURE::moveIncPixel(pFront, pFirst);
+            }
+
+            Dirty();
+        }
+    }
+
+    void ShiftLeft(uint16_t shiftCount, uint16_t first = 0, uint16_t last = 0xffff)
+    {
+        if (last >= _countPixels)
+        {
+            last = _countPixels - 1;
+        }
+
+        if (first < _countPixels && 
+            last < _countPixels && 
+            first < last &&
+            (last - first) >= shiftCount)
+        {
+            uint8_t* pixels = _method.getPixels();
+            uint8_t* pFirst = T_COLOR_FEATURE::getPixelAddress(pixels, first);
+            uint8_t* pLast = T_COLOR_FEATURE::getPixelAddress(pixels, last);
+            uint8_t* pFront = T_COLOR_FEATURE::getPixelAddress(pixels, first + shiftCount);
+            while (pFront <= pLast)
+            {
+                T_COLOR_FEATURE::moveIncPixel(pFirst, pFront);
+            }
+
+            Dirty();
+        }
+    }
+
+    void RotateRight(uint16_t rotationCount, uint16_t first = 0, uint16_t last = 0xffff)
+    {
+        if (last >= _countPixels)
+        {
+            last = _countPixels - 1;
+        }
+
+        if (first < _countPixels &&
+            last < _countPixels &&
+            first < last &&
+            (last - first) >= rotationCount)
+        {
+
+            // store in temp
+            uint8_t temp[rotationCount * T_COLOR_FEATURE::PixelSize];
+            uint8_t* pixels = _method.getPixels();
+            uint8_t* pFirst = T_COLOR_FEATURE::getPixelAddress(temp, 0);
+            uint8_t* pLast = T_COLOR_FEATURE::getPixelAddress(temp, rotationCount - 1);
+            uint8_t* pBack = T_COLOR_FEATURE::getPixelAddress(pixels, last);
+            while (pLast >= pFirst)
+            {
+                T_COLOR_FEATURE::moveDecPixel(pLast, pBack);
+            }
+
+            // shift data
+            ShiftRight(rotationCount, first, last);
+
+            // move temp back
+            pLast = T_COLOR_FEATURE::getPixelAddress(temp, rotationCount - 1);
+            pBack = T_COLOR_FEATURE::getPixelAddress(pixels, first + rotationCount - 1);
+            while (pLast >= pFirst)
+            {
+                T_COLOR_FEATURE::moveDecPixel(pBack, pLast);
+            }
+
+            Dirty();
+        }
+    }
+
+    void ShiftRight(uint16_t shiftCount, uint16_t first = 0, uint16_t last = 0xffff)
+    {
+        if (last >= _countPixels)
+        {
+            last = _countPixels - 1;
+        }
+
+        if (first < _countPixels &&
+            last < _countPixels &&
+            first < last &&
+            (last - first) >= shiftCount)
+        {
+            uint8_t* pixels = _method.getPixels();
+            uint8_t* pFirst = T_COLOR_FEATURE::getPixelAddress(pixels, first);
+            uint8_t* pLast = T_COLOR_FEATURE::getPixelAddress(pixels, last);
+            uint8_t* pBack = T_COLOR_FEATURE::getPixelAddress(pixels, last - shiftCount);
+            while (pBack >= pFirst)
+            {
+                T_COLOR_FEATURE::moveDecPixel(pLast, pBack);
+            }
+
+            Dirty();
+        }
+    }
+
 private:
     const uint16_t _countPixels; // Number of RGB LEDs in strip
 

src/internal/NeoColorFeatures.h

@@ -36,6 +36,27 @@ public:
         return pPixels + indexPixel * PixelSize;
     }
 
+    static void copyIncPixel(uint8_t*& pPixelDest, uint8_t* pPixelSrc)
+    {
+        *pPixelDest++ = *pPixelSrc++;
+        *pPixelDest++ = *pPixelSrc++;
+        *pPixelDest++ = *pPixelSrc;
+    }
+
+    static void moveIncPixel(uint8_t*& pPixelDest, uint8_t*& pPixelSrc)
+    {
+        *pPixelDest++ = *pPixelSrc++;
+        *pPixelDest++ = *pPixelSrc++;
+        *pPixelDest++ = *pPixelSrc++;
+    }
+
+    static void moveDecPixel(uint8_t*& pPixelDest, uint8_t*& pPixelSrc)
+    {
+        *pPixelDest-- = *pPixelSrc--;
+        *pPixelDest-- = *pPixelSrc--;
+        *pPixelDest-- = *pPixelSrc--;
+    }
+
     typedef RgbColor ColorObject;
 };
 
@@ -49,6 +70,32 @@ public:
         return pPixels + indexPixel * PixelSize;
     }
 
+    static void copyIncPixel(uint8_t*& pPixelDest, uint8_t* pPixelSrc)
+    {
+        uint32_t* pDest = (uint32_t*)pPixelDest;
+        uint32_t* pSrc = (uint32_t*)pPixelSrc;
+        *pDest++ = *pSrc;
+        pPixelDest = (uint8_t*)pDest;
+    }
+
+    static void moveIncPixel(uint8_t*& pPixelDest, uint8_t*& pPixelSrc)
+    {
+        uint32_t* pDest = (uint32_t*)pPixelDest;
+        uint32_t* pSrc = (uint32_t*)pPixelSrc;
+        *pDest++ = *pSrc++;
+        pPixelDest = (uint8_t*)pDest;
+        pPixelSrc = (uint8_t*)pSrc;
+    }
+
+    static void moveDecPixel(uint8_t*& pPixelDest, uint8_t*& pPixelSrc)
+    {
+        uint32_t* pDest = (uint32_t*)pPixelDest;
+        uint32_t* pSrc = (uint32_t*)pPixelSrc;
+        *pDest-- = *pSrc--;
+        pPixelDest = (uint8_t*)pDest;
+        pPixelSrc = (uint8_t*)pSrc;
+    }
+
     typedef RgbwColor ColorObject;
 };