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

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V

module img
import gx
import sim
pub struct ValidColor {
gx.Color
pub mut:
valid bool
}
pub struct ImageWritter {
settings ImageSettings
pub mut:
writer PPMWriter
current_index int
buffer []ValidColor
}
pub fn new_image_writer(mut writer PPMWriter, settings ImageSettings) &ImageWritter {
total_pixels := settings.width * settings.height
mut buffer := []ValidColor{len: total_pixels, init: ValidColor{
valid: false
}}
return &ImageWritter{
writer: writer
settings: settings
buffer: buffer
}
}
pub fn (mut iw ImageWritter) handle(result sim.SimResult) ?int {
total_pixels := iw.settings.width * iw.settings.height
// find the closest magnet
iw.buffer[result.id].Color = compute_pixel(result)
iw.buffer[result.id].valid = true
for iw.current_index < total_pixels && iw.buffer[iw.current_index].valid {
iw.writer.handle_pixel(iw.buffer[iw.current_index].Color) or {
sim.log(@MOD + '.' + @FN + ': pixel handler failed. Error $err')
break
}
iw.current_index++
}
if iw.current_index == total_pixels {
iw.writer.write() or { panic('Could not write image') }
return none
}
return iw.current_index
}
pub fn compute_pixel(result sim.SimResult) gx.Color {
closest_to_m1 := result.magnet1_distance < result.magnet2_distance
&& result.magnet1_distance < result.magnet3_distance
closest_to_m2 := result.magnet2_distance < result.magnet1_distance
&& result.magnet2_distance < result.magnet3_distance
if closest_to_m1 {
return gx.red
} else if closest_to_m2 {
return gx.green
} else {
return gx.blue
}
}