76 lines
2.2 KiB
Text
76 lines
2.2 KiB
Text
import "graphics" for Canvas, ImageData, Color
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import "dome" for Window, Process
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import "io" for FileSystem
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class Bitmap {
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construct new(fileName, fileName2, width, height) {
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Window.title = "Bitmap - read PPM file"
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Window.resize(width, height)
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Canvas.resize(width, height)
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_w = width
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_h = height
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_fn2 = fileName2
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loadPPMFile(fileName)
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}
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init() {
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toGrayScale()
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// display images side by side
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_bmp.draw(0, 0)
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_bmp2.draw(536, 0)
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// save gray scale image to file
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_bmp2.saveToFile(_fn2)
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}
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loadPPMFile(fileName) {
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var ppm = FileSystem.load(fileName)
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var count = ppm.count // ensure file is fully loaded before proceeding
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if (ppm[0..1] != "P6") {
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System.print("The loaded file is not a P6 file.")
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Process.exit()
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}
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var lines = ppm.split("\n")
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if (Num.fromString(lines[2]) > 255) {
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System.print("The maximum color value can't exceed 255.")
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Process.exit()
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}
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var wh = lines[1].split(" ")
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var w = Num.fromString(wh[0])
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var h = Num.fromString(wh[1])
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_bmp = ImageData.create(fileName, w, h)
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var bytes = ppm.bytes
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var i = bytes.count - 3 * w * h
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for (y in 0...h) {
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for (x in 0...w) {
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var r = bytes[i]
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var g = bytes[i+1]
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var b = bytes[i+2]
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var c = Color.rgb(r, g, b)
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pset(x, y, c)
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i = i + 3
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}
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}
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}
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toGrayScale() {
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_bmp2 = ImageData.create("gray scale", _bmp.width, _bmp.height)
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for (x in 0..._bmp.width) {
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for (y in 0..._bmp.height) {
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var c1 = _bmp.pget(x, y)
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var lumin = (0.2126 * c1.r + 0.7152 * c1.g + 0.0722 * c1.b).floor
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var c2 = Color.rgb(lumin, lumin,lumin, c1.a)
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_bmp2.pset(x, y, c2)
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}
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}
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}
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pset(x, y, col) { _bmp.pset(x, y, col) }
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pget(x, y) { _bmp.pget(x, y) }
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update() {}
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draw(alpha) {}
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}
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var Game = Bitmap.new("Lenna100.ppm", "Lenna100_gs.jpg", 1048, 512)
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