在Microsoft Small Basic中如何将CSV像素数据转为BMP等栅格图像

Absolutely! You can definitely convert that hex pixel array into a BMP (or other raster format) using Microsoft Small Basic—here are two straightforward approaches tailored to the language's capabilities:

This is the simplest method, perfect for prototyping or when you don't need to dig into low-level file structures. Small Basic's GraphicsWindow lets you draw each pixel directly, then save the entire canvas as an image file.

Step-by-Step: #

1. Define your image dimensions: You'll need to know the width and height of your image (calculate this from your array length—width * height = total pixels).
2. Set up the drawing window: Match the window size to your image dimensions.
3. Loop through your pixel array: Convert each hex value (like FFFFFF) to a Small Basic-compatible color (prefix with #), then draw a 1x1 rectangle for each pixel.
4. Save the result: Use GraphicsWindow.SaveImage() to export as BMP, PNG, or JPG.

Example Code: #

' Replace these with your actual values
width = 100
height = 100
' Assume pixelArray is your existing array of hex color strings (e.g., "FFFFFF", "000000")

' Configure the drawing window
GraphicsWindow.Width = width
GraphicsWindow.Height = height
GraphicsWindow.BackgroundColor = "White"

' Draw each pixel
for y = 1 to height
    for x = 1 to width
        ' Calculate array index (Small Basic uses 1-based indexing)
        pixelIndex = (y - 1) * width + x
        hexColor = pixelArray[pixelIndex]
        ' Convert hex to Small Basic color format
        GraphicsWindow.PenColor = "#" + hexColor
        ' Draw a 1x1 rectangle for the pixel
        GraphicsWindow.DrawRectangle(x - 1, y - 1, 1, 1)
    endfor
endfor

' Save the image to your desired path
GraphicsWindow.SaveImage("C:\Your\Output\Path\result.bmp")

If you want to understand how image formats work under the hood, you can construct a BMP file directly by writing its binary structure. BMP is a straightforward format with a fixed header, so this is totally doable in Small Basic.

Key Notes for BMP: #

• BMP stores pixels in BGR order (not RGB), so you'll need to swap the red and blue components of your hex values.
• Rows of pixels must be padded to a multiple of 4 bytes—add zero bytes if needed.
• The image is stored from bottom to top (so we'll loop from the last row to the first).

Example Code: #

width = 100
height = 100
' Initialize a test array (replace with your actual pixel data)
pixelArray = Array.Create(width * height)
for i = 1 to width * height
    pixelArray[i] = "FFFFFF" ' White pixels for testing
endfor

' Calculate BMP structure values
bytesPerPixel = 3 ' 24-bit color (R, G, B)
rowSize = width * bytesPerPixel
padding = (4 - (rowSize mod 4)) mod 4 ' Padding to align rows to 4 bytes
totalPixelBytes = (rowSize + padding) * height
fileSize = 14 + 40 + totalPixelBytes ' Total BMP file size (headers + pixels)

' Create and write to the BMP file
file = File.OpenWrite("C:\Your\Output\Path\manual.bmp")

' Write BMP File Header (14 bytes)
File.WriteByte(file, 66) ' 'B'
File.WriteByte(file, 77) ' 'M'
File.WriteInt32(file, fileSize)
File.WriteInt16(file, 0) ' Reserved
File.WriteInt16(file, 0) ' Reserved
File.WriteInt32(file, 14 + 40) ' Offset to pixel data

' Write BMP Info Header (40 bytes)
File.WriteInt32(file, 40) ' Header size
File.WriteInt32(file, width)
File.WriteInt32(file, height)
File.WriteInt16(file, 1) ' Number of color planes
File.WriteInt16(file, 24) ' Bits per pixel (24-bit)
File.WriteInt32(file, 0) ' No compression
File.WriteInt32(file, totalPixelBytes)
File.WriteInt32(file, 0) ' Horizontal resolution (default)
File.WriteInt32(file, 0) ' Vertical resolution (default)
File.WriteInt32(file, 0) ' Number of colors in palette
File.WriteInt32(file, 0) ' Number of important colors

' Write pixel data (bottom to top, BGR order)
for y = height downto 1
    for x = 1 to width
        pixelIndex = (y - 1) * width + x
        hexColor = pixelArray[pixelIndex]
        ' Convert hex to RGB bytes, then write as BGR
        red = Convert.ToInt32(Text.GetSubText(hexColor, 1, 2), 16)
        green = Convert.ToInt32(Text.GetSubText(hexColor, 3, 2), 16)
        blue = Convert.ToInt32(Text.GetSubText(hexColor, 5, 2), 16)
        File.WriteByte(file, blue)
        File.WriteByte(file, green)
        File.WriteByte(file, red)
    endfor
    ' Add padding bytes for row alignment
    for p = 1 to padding
        File.WriteByte(file, 0)
    endfor
endfor

' Close the file to save changes
File.Close(file)

Quick Tips: #

• Double-check your array indexing—Small Basic uses 1-based arrays, so make sure your pixel positions align correctly.
• For the manual BMP method, if your image uses 8-bit (indexed) color instead of 24-bit, you'll need to add a color palette to the header.
• Test with a small array first (like 10x10) to debug any alignment or color issues.

内容的提问来源于stack exchange，提问作者Oliver Bryant