1 files changed, 36 insertions, 0 deletions
diff --git a/src/models/electric-flux/state.ts b/src/models/electric-flux/state.ts
new file mode 100644
index 0000000..7bded33
--- /dev/null
+++ b/src/models/electric-flux/state.ts
@@ -0,0 +1,36 @@
+import type { ClosedSurface, PointCharge, SurfaceShape } from './physics';
+
+export interface FluxState {
+  chargeNC: number;
+  chargeX: number;
+  size: number;
+  shape: SurfaceShape;
+  fieldLines: boolean;
+  surface: boolean;
+  normals: boolean;
+}
+
+export const defaultState: Readonly<FluxState> = {
+  chargeNC: 2,
+  chargeX: 0,
+  size: 1.8,
+  shape: 'sphere',
+  fieldLines: true,
+  surface: true,
+  normals: false,
+};
+
+export const presets = {
+  positive: { ...defaultState },
+  negative: { ...defaultState, chargeNC: -2 },
+  outside: { ...defaultState, chargeX: 3.2 },
+} satisfies Record<string, FluxState>;
+
+export type Preset = keyof typeof presets;
+
+export function physicsInputs(state: FluxState): { charge: PointCharge; surface: ClosedSurface } {
+  return {
+    charge: { coulombs: state.chargeNC * 1e-9, position: { x: state.chargeX, y: 0, z: 0 } },
+    surface: { shape: state.shape, size: state.size },
+  };
+}