feat(contrib): add deltatime and flycam implementations

1 files changed, 55 insertions, 0 deletions

diff --git a/stockton-contrib/src/flycam.rs b/stockton-contrib/src/flycam.rs
new file mode 100644
index 0000000..7b82c4f
--- /dev/null
+++ b/stockton-contrib/src/flycam.rs
@@ -0,0 +1,55 @@
+/*
+ * Copyright (C) Oscar Shrimpton 2020
+ *
+ * This program is free software: you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the Free
+ * Software Foundation, either version 3 of the License, or (at your option)
+ * any later version.
+ *
+ * This program is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+use stockton_input::{Axis, InputManager};
+use stockton_types::components::Transform;
+use stockton_types::Vector3;
+
+use crate::delta_time::Timing;
+
+pub trait FlycamInput {
+    fn get_x_axis(&self) -> &Axis;
+    fn get_y_axis(&self) -> &Axis;
+    fn get_z_axis(&self) -> &Axis;
+}
+
+pub struct FlycamControlled {
+    pub speed: f32,
+}
+
+#[system(for_each)]
+pub fn flycam_move<T>(
+    #[resource] manager: &T,
+    #[resource] timing: &Timing,
+    transform: &mut Transform,
+    flycam: &FlycamControlled,
+) where
+    T: 'static + InputManager,
+    T::Inputs: FlycamInput,
+{
+    // TODO: Deal with looking around
+
+    let inputs = manager.get_inputs();
+    let speed = flycam.speed;
+    let impulse = Vector3::new(
+        **inputs.get_x_axis() as f32 * speed * timing.delta_time,
+        **inputs.get_y_axis() as f32 * speed * timing.delta_time,
+        **inputs.get_z_axis() as f32 * speed * timing.delta_time,
+    );
+
+    transform.position += impulse;
+}