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// PPM image format - https://netpbm.sourceforge.net/doc/ppm.html
const std = @import("std");
const ImageSize = 600;
const Color = struct {
r: u8,
g: u8,
b: u8,
pub fn initRandom() Color {
const rand = std.crypto.random;
return Color{
.r = rand.int(u8),
.g = rand.int(u8),
.b = rand.int(u8),
};
}
pub fn toString(self: Color) []const u8 {
return std.fmt.allocPrint(std.heap.page_allocator, "{d} {d} {d} ", .{ self.r, self.g, self.b }) catch unreachable;
}
};
pub fn main() !void {
const image_file = try std.fs.cwd().createFile("image.ppm", .{});
defer image_file.close();
// NOTE: This should be done at compile time instead since the data is
// known in advance. I am leaving this here as a reference.
// const header: []const u8 = std.fmt.allocPrint(std.heap.page_allocator, "P3\n{d} {d}\n255\n", .{ ImageSize, ImageSize }) catch unreachable;
// NOTE: This is done at compile time instead. It does look a bit ugly
// and there must be a better way of doing this. Good enough!
const header = "P3\n" ++ std.fmt.comptimePrint("{d}", .{ImageSize}) ++ " " ++ std.fmt.comptimePrint("{d}", .{ImageSize}) ++ "\n255\n";
_ = try image_file.write(header);
for (0..(ImageSize * ImageSize)) |_| {
const color = Color.initRandom();
_ = try image_file.write(color.toString());
}
}
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