126 lines
3.8 KiB
C++
126 lines
3.8 KiB
C++
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/*
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This demo is best viewed using the FastLED compiler.
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Install: pip install fastled
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Run: fastled <this sketch directory>
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This will compile and preview the sketch in the browser, and enable
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all the UI elements you see below.
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*/
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// Perlin noise fire procedure
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// 16x16 rgb led cylinder demo
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// Exactly the same as the FireMatrix example, but with a cylinder, meaning that the x=0
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// and x = len-1 are connected.
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// This also showcases the inoise16(x,y,z,t) function which handles 3D+time noise effects.
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// Keep in mind that a cylinder is embedded in a 3D space with time being used to add
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// additional noise to the effect.
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#include "FastLED.h"
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#include "fl/ui.h"
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#include "fl/xymap.h"
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#include "fx/time.h"
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using namespace fl;
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#define HEIGHT 100
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#define WIDTH 100
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#define SERPENTINE true
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#define BRIGHTNESS 255
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UITitle title("FireCylinder Demo");
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UIDescription description("This Fire demo wraps around the cylinder. It uses Perlin noise to create a fire effect.");
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TimeScale timeScale(0, 1.0f);
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UISlider scaleXY("Scale", 8, 1, 100, 1);
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UISlider speedY("SpeedY", 1.3, 1, 6, .1);
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UISlider scaleX("ScaleX", .3, 0.1, 3, .01);
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UISlider invSpeedZ("Inverse SpeedZ", 20, 1, 100, 1);
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UISlider brightness("Brightness", 255, 0, 255, 1);
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UINumberField palette("Palette", 0, 0, 2);
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CRGB leds[HEIGHT * WIDTH];
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DEFINE_GRADIENT_PALETTE(firepal){
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// define fire palette
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0, 0, 0, 0, // black
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32, 255, 0, 0, // red
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190, 255, 255, 0, // yellow
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255, 255, 255, 255 // white
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};
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DEFINE_GRADIENT_PALETTE(electricGreenFirePal){
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0, 0, 0, 0, // black
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32, 0, 70, 0, // dark green
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190, 57, 255, 20, // electric neon green
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255, 255, 255, 255 // white
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};
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DEFINE_GRADIENT_PALETTE(electricBlueFirePal){
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0, 0, 0, 0, // Black
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32, 0, 0, 70, // Dark blue
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128, 20, 57, 255, // Electric blue
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255, 255, 255, 255 // White
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};
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XYMap xyMap(HEIGHT, WIDTH, SERPENTINE);
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void setup() {
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Serial.begin(115200);
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FastLED.addLeds<NEOPIXEL, 3>(leds, HEIGHT * WIDTH).setScreenMap(xyMap);
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FastLED.setCorrection(TypicalLEDStrip);
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}
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uint8_t getPaletteIndex(uint32_t millis32, int width, int max_width, int height, int max_height,
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uint32_t y_speed) {
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// get palette index
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uint16_t scale = scaleXY.as<uint16_t>();
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float xf = (float)width / (float)max_width;
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uint8_t x = (uint8_t)(xf * 255);
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uint32_t cosx = cos8(x);
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uint32_t sinx = sin8(x);
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float trig_scale = scale * scaleX.value();
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cosx *= trig_scale;
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sinx *= trig_scale;
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uint32_t y = height * scale + y_speed; // swapped: now using height
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uint16_t z = millis32 / invSpeedZ.as<uint16_t>();
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uint16_t noise16 = inoise16(cosx << 8, sinx << 8, y << 8, 0);
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uint8_t noise_val = noise16 >> 8;
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int8_t subtraction_factor = abs8(height - (max_height - 1)) * 255 /
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(max_height - 1); // swapped: now using height
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return qsub8(noise_val, subtraction_factor);
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}
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CRGBPalette16 getPalette() {
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// get palette
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switch (palette) {
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case 0:
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return firepal;
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case 1:
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return electricGreenFirePal;
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case 2:
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return electricBlueFirePal;
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default:
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return firepal;
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}
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}
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void loop() {
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FastLED.setBrightness(brightness);
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CRGBPalette16 myPal = getPalette();
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uint32_t now = millis();
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timeScale.setScale(speedY);
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uint32_t y_speed = timeScale.update(now);
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for (int width = 0; width < WIDTH; width++) {
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for (int height = 0; height < HEIGHT; height++) {
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uint8_t palette_index =
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getPaletteIndex(now, width, WIDTH, height, HEIGHT, y_speed);
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CRGB c = ColorFromPalette(myPal, palette_index, BRIGHTNESS);
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int index = xyMap((WIDTH - 1) - width, (HEIGHT - 1) - height);
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leds[index] = c;
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}
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}
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FastLED.show();
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}
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