Release God's Eye View as open source

src/camera.js

@@ -0,0 +1,76 @@
+import * as Cesium from 'cesium';
+
+/**
+ * Camera presets for notable locations.
+ * Phase 1 default: fly to Austin, TX on load.
+ */
+export const CAMERA_PRESETS = {
+  austin: {
+    destination: Cesium.Cartesian3.fromDegrees(-97.7431, 30.2672, 800),
+    orientation: {
+      heading: Cesium.Math.toRadians(0),
+      pitch: Cesium.Math.toRadians(-35),
+      roll: 0.0,
+    },
+  },
+  sf: {
+    destination: Cesium.Cartesian3.fromDegrees(-122.4194, 37.7749, 1000),
+    orientation: {
+      heading: Cesium.Math.toRadians(30),
+      pitch: Cesium.Math.toRadians(-30),
+      roll: 0.0,
+    },
+  },
+  nyc: {
+    destination: Cesium.Cartesian3.fromDegrees(-73.9857, 40.7484, 1200),
+    orientation: {
+      heading: Cesium.Math.toRadians(-20),
+      pitch: Cesium.Math.toRadians(-30),
+      roll: 0.0,
+    },
+  },
+};
+
+/**
+ * Fly the camera to a preset location with a smooth animation.
+ */
+export function flyToPreset(viewer, presetName, duration = 3.0) {
+  const preset = CAMERA_PRESETS[presetName];
+  if (!preset) return;
+
+  viewer.camera.flyTo({
+    destination: preset.destination,
+    orientation: preset.orientation,
+    duration,
+    easingFunction: Cesium.EasingFunction.CUBIC_IN_OUT,
+  });
+}
+
+/**
+ * Set camera to Austin on load with a cinematic fly-in.
+ */
+export function flyToAustin(viewer) {
+  // Start from a high altitude, then fly down
+  viewer.camera.setView({
+    destination: Cesium.Cartesian3.fromDegrees(-97.7431, 30.2672, 25000),
+    orientation: {
+      heading: Cesium.Math.toRadians(0),
+      pitch: Cesium.Math.toRadians(-90),
+      roll: 0.0,
+    },
+  });
+
+  // Cinematic fly-in after a brief pause
+  setTimeout(() => {
+    viewer.camera.flyTo({
+      destination: Cesium.Cartesian3.fromDegrees(-97.7431, 30.2672, 600),
+      orientation: {
+        heading: Cesium.Math.toRadians(15),
+        pitch: Cesium.Math.toRadians(-30),
+        roll: 0.0,
+      },
+      duration: 4.0,
+      easingFunction: Cesium.EasingFunction.CUBIC_IN_OUT,
+    });
+  }, 500);
+}