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60
MatrixRenderer.cs
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60
MatrixRenderer.cs
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using SkiaSharp;
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using System.Threading.Tasks;
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public class MatrixRenderer
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{
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private readonly WledDdpClient _wled;
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private readonly int _width = 64;
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private readonly int _height = 64;
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public MatrixRenderer(string wledIp)
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{
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_wled = new WledDdpClient(wledIp);
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}
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public async Task DrawAndSendFrameAsync(float currentTemp)
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{
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// 1. Create a 64x64 canvas
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using SKBitmap bitmap = new SKBitmap(_width, _height, SKColorType.Rgba8888, SKAlphaType.Premul);
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using SKCanvas canvas = new SKCanvas(bitmap);
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// 2. Clear background to black
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canvas.Clear(SKColors.Black);
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// 3. Draw something (e.g., Temperature Text)
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// Paint now only handles the color and rendering style
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using SKPaint textPaint = new SKPaint
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{
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Color = SKColors.Orange,
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IsAntialias = false // Keep crisp pixels for LED matrices
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};
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// Font handles the typography
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using SKFont textFont = new SKFont
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{
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Size = 16
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};
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// DrawText now takes the string, X, Y, the font, and the paint
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//canvas.DrawText($"{currentTemp:F1}c", 4, 32, textFont, textPaint);
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// DrawText now takes the string, X, Y, alignment, the font, and the paint
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canvas.DrawText($"{currentTemp:F1}c", 4, 32, SKTextAlign.Left, textFont, textPaint);
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// 4. Convert 32-bit RGBA to 24-bit RGB for WLED
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byte[] rgbaBytes = bitmap.Bytes;
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byte[] rgbBytes = new byte[_width * _height * 3];
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int rgbIndex = 0;
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for (int i = 0; i < rgbaBytes.Length; i += 4)
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{
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rgbBytes[rgbIndex++] = rgbaBytes[i]; // R
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rgbBytes[rgbIndex++] = rgbaBytes[i + 1]; // G
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rgbBytes[rgbIndex++] = rgbaBytes[i + 2]; // B
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// We ignore rgbaBytes[i + 3] (Alpha channel)
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}
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// 5. Fire it over UDP!
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await _wled.SendFrameAsync(rgbBytes);
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}
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}
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13
Program.cs
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13
Program.cs
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var renderer = new MatrixRenderer("192.168.0.150"); // Replace with WLED IP
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while (true)
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{
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// TODO: Query InfluxDB for your BME680 data here
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float bme680Temp = 22.5f;
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await renderer.DrawAndSendFrameAsync(bme680Temp);
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// Update screen at 30 FPS for smooth transitions,
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// or every 5 seconds if just showing static data.
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await Task.Delay(1000 / 30);
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}
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15
WLED_DDP_Client.csproj
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15
WLED_DDP_Client.csproj
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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net10.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<PackageReference Include="SkiaSharp" Version="4.151.1" />
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<PackageReference Include="SkiaSharp.NativeAssets.Linux.NoDependencies" Version="2.88.6" />
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</ItemGroup>
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</Project>
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3
WLED_DDP_Client.slnx
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3
WLED_DDP_Client.slnx
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<Solution>
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<Project Path="WLED_DDP_Client.csproj" />
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</Solution>
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68
WledDdpClient.cs
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68
WledDdpClient.cs
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using System;
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using System.Net.Sockets;
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using System.Threading.Tasks;
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public class WledDdpClient
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{
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private readonly UdpClient _udp;
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private readonly string _ip;
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private const int Port = 4048; // Standard DDP UDP port
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private byte _sequence = 1;
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public WledDdpClient(string ipAddress)
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{
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_ip = ipAddress;
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_udp = new UdpClient();
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}
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public async Task SendFrameAsync(byte[] rgbData)
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{
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// Max payload per packet to stay under standard 1500 byte MTU
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const int maxPixelsPerPacket = 480;
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const int maxBytesPerPacket = maxPixelsPerPacket * 3;
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int totalBytes = rgbData.Length;
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int offset = 0;
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while (offset < totalBytes)
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{
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int chunkLength = Math.Min(maxBytesPerPacket, totalBytes - offset);
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bool isLast = (offset + chunkLength) >= totalBytes;
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byte[] packet = new byte[10 + chunkLength];
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// Byte 0: Flags. 0x40 = Version 1. 0x01 = Push bit.
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// We only "Push" to the display on the final chunk of the frame.
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packet[0] = (byte)(isLast ? 0x41 : 0x40);
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// Byte 1: Sequence (0-15)
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packet[1] = _sequence;
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// Byte 2: Data type (1 = RGB)
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packet[2] = 1;
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// Byte 3: Destination ID (Default 1)
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packet[3] = 1;
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// Bytes 4-7: Data Offset (32-bit Big Endian)
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packet[4] = (byte)(offset >> 24);
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packet[5] = (byte)(offset >> 16);
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packet[6] = (byte)(offset >> 8);
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packet[7] = (byte)(offset);
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// Bytes 8-9: Data Length (16-bit Big Endian)
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packet[8] = (byte)(chunkLength >> 8);
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packet[9] = (byte)(chunkLength);
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// Copy the pixel payload into the packet
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Buffer.BlockCopy(rgbData, offset, packet, 10, chunkLength);
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await _udp.SendAsync(packet, packet.Length, _ip, Port);
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offset += chunkLength;
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}
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// Increment sequence for the next frame (wrap at 15)
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_sequence = (byte)((_sequence + 1) % 16);
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}
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}
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