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v/examples/pendulum-simulation/modules/sim/img/ppm.v

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module img
import gx
import os
import sim
[params]
pub struct ImageSettings {
pub:
width int = sim.default_width
height int = sim.default_height
cache_size int = 200
}
pub fn new_image_settings(settings ImageSettings) ImageSettings {
return ImageSettings{
...settings
}
}
pub fn image_settings_from_grid(grid sim.GridSettings) ImageSettings {
return ImageSettings{
width: grid.width
height: grid.height
}
}
pub fn (s ImageSettings) to_grid_settings() sim.GridSettings {
return sim.GridSettings{
width: s.width
height: s.height
}
}
pub struct PPMWriter {
mut:
file os.File
cache []byte
cache_size int
}
pub fn ppm_writer_for_fname(fname string, settings ImageSettings) ?&PPMWriter {
mut writer := &PPMWriter{
cache_size: settings.cache_size
cache: []byte{cap: settings.cache_size}
}
writer.start_for_file(fname, settings) ?
return writer
}
pub fn (mut writer PPMWriter) start_for_file(fname string, settings ImageSettings) ? {
writer.file = os.create(fname) ?
writer.file.writeln('P6 $settings.width $settings.height 255') ?
}
pub fn (mut writer PPMWriter) handle_pixel(p gx.Color) ? {
if writer.cache.len >= writer.cache_size {
writer.write() ?
writer.flush() ?
}
writer.cache << [p.r, p.g, p.b]
}
pub fn (mut writer PPMWriter) flush() ? {
writer.cache.clear()
}
pub fn (mut writer PPMWriter) write() ? {
writer.file.write(writer.cache) ?
}
pub fn (mut writer PPMWriter) close() {
writer.file.close()
}