From cae9cab6e9245b442fe54c9d5f96bb2bd2c7d7c6 Mon Sep 17 00:00:00 2001
From: Raphael Nestler <raphael.nestler@gmail.com>
Date: Fri, 23 Aug 2019 03:10:39 +0200
Subject: [PATCH] Rolling buffer
---
sensor-plot/src/main.rs | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/sensor-plot/src/main.rs b/sensor-plot/src/main.rs
index 0deb211..993aa53 100644
--- a/sensor-plot/src/main.rs
+++ b/sensor-plot/src/main.rs
@@ -7,7 +7,7 @@ use core::fmt::Write;
struct PlotBuffer {
buffer: [i32; Display::W as usize],
- index: usize,
+ index: u16,
}
impl PlotBuffer {
@@ -27,9 +27,9 @@ impl PlotBuffer {
}
pub fn add_sample(&mut self, sample: i32) {
- self.buffer[self.index] = sample;
+ self.buffer[self.index as usize] = sample;
self.index += 1;
- if self.index >= Display::W as usize {
+ if self.index >= Display::W {
self.index = 0;
}
}
@@ -45,9 +45,11 @@ impl PlotBuffer {
};
for i in 0..Display::W {
+ let index = (self.index + i) % Display::W;
display.pixel(
i,
- ((Display::H - 1) as f32 - ((self.buffer[i as usize] as f32 - min) * multiplier))
+ ((Display::H - 1) as f32
+ - ((self.buffer[index as usize] as f32 - min) * multiplier))
as u16,
Color::white(),
);
--
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