1 files changed, 65 insertions, 0 deletions
diff --git a/web/pw-frontend/planetwars-rs/src/utils.rs b/web/pw-frontend/planetwars-rs/src/utils.rs
new file mode 100644
index 0000000..a903912
--- /dev/null
+++ b/web/pw-frontend/planetwars-rs/src/utils.rs
@@ -0,0 +1,65 @@
+pub fn set_panic_hook() {
+    // When the `console_error_panic_hook` feature is enabled, we can call the
+    // `set_panic_hook` function at least once during initialization, and then
+    // we will get better error messages if our code ever panics.
+    //
+    // For more details see
+    // https://github.com/rustwasm/console_error_panic_hook#readme
+    #[cfg(feature = "console_error_panic_hook")]
+    console_error_panic_hook::set_once();
+}
+
+/// this is total extra, so it the planet viewbox is like 100px wide, it will now be in total 110 pixels wide
+static VIEWBOX_SCALE: f32 = 0.1;
+
+pub static COLORS: [[f32; 3]; 10] = [
+    [0.5, 0.5, 0.5],
+    [1.0, 0.50, 0.0],   // #FF8000
+    [0.0, 0.50, 1.0],   // #0080ff
+    [1.0, 0.4, 0.58],   // #FF6693
+    [0.24, 0.79, 0.33], // #3fcb55
+    [0.79, 0.76, 0.24], // #cbc33f
+    [0.81, 0.25, 0.91], // #cf40e9
+    [0.94, 0.32, 0.32], // #FF3F0D
+    [0.11, 0.93, 0.94], // #1beef0
+    [0.05, 0.77, 1.0],  // #0DC5FF
+];
+
+use super::types;
+
+pub fn caclulate_viewbox(planets: &Vec<types::Planet>) -> Vec<f32> {
+    let mut iter = planets.iter();
+
+    let init = match iter.next() {
+        Some(p) => (p.x, p.y, p.x, p.y),
+        None => return vec![0.0, 0.0, 0.0, 0.0],
+    };
+    let (min_x, min_y, max_x, max_y) =
+        planets
+            .iter()
+            .fold(init, |(min_x, min_y, max_x, max_y), p| {
+                (
+                    min_x.min(p.x),
+                    min_y.min(p.y),
+                    max_x.max(p.x),
+                    max_y.max(p.y),
+                )
+            });
+
+    let (width, height) = (max_x - min_x, max_y - min_y);
+    let (dx, dy) = (
+        (VIEWBOX_SCALE * width).max(6.0),
+        (VIEWBOX_SCALE * height).max(6.0),
+    );
+
+    vec![min_x - dx / 2.0, min_y - dy / 2.0, width + dx, height + dy]
+}
+
+pub fn get_planets(planets: &Vec<types::Planet>, r: f32) -> Vec<f32> {
+    planets.iter().fold(Vec::new(), |mut cum, p| {
+        cum.push(p.x);
+        cum.push(p.y);
+        cum.push(r);
+        cum
+    })
+}