Add a_tension_span

1 files changed, 105 insertions, 0 deletions

diff --git a/2026/games_submissions/crm148/pulse.js b/2026/games_submissions/crm148/pulse.js
new file mode 100644
index 0000000..3a0b951
--- /dev/null
+++ b/2026/games_submissions/crm148/pulse.js
@@ -0,0 +1,105 @@
+
+import { getCosmos } from './cosmos.js';
+import { randomAngle, toDegreesInt, normalizeAngle } from './util.js';
+import { globalView } from './view.js';
+import Vec2 from './vec2.js';
+import Color from './color.js';
+
+var cosmos;
+
+export default class Pulse {
+    angle0;
+    angle1;
+    radius;
+    maxradius = Math.sqrt((gameCanvas.width * gameCanvas.width) +
+                          (gameCanvas.height * gameCanvas.height)) / 2;
+    velocity;
+    state = 'state_growing';
+    energy;
+
+    constructor(angle0, arcLength, radius, velocity, energy) {
+        this.angle0 = normalizeAngle(angle0);
+        this.angle1 = normalizeAngle(angle0 + arcLength);
+        this.radius = radius;
+        this.velocity = velocity;
+        this.energy = energy;
+        if (!cosmos) {
+            cosmos = getCosmos();
+        }
+    }
+
+    static StrengthPulse(radius, strength) {
+        if (!cosmos) {
+            cosmos = getCosmos();
+        }
+        // console.log('pulse strength',strength);
+        var str_factor = 0.8 * (strength / cosmos.pulse_max_str);
+        return new Pulse(cosmos.angle,
+                         (2 * Math.PI) * str_factor,
+                         radius,
+                         cosmos.pulse_vel_base * str_factor,
+                         strength
+                        );
+    }
+
+
+    contains(p, tolerance) {
+        var angle = Math.atan2(p.y, p.x);
+        if (Math.abs(p.length() - this.radius) < 2) {
+            var da1 = toDegreesInt(normalizeAngle(angle - this.angle0));
+            var da2 = toDegreesInt(normalizeAngle(this.angle1 - angle));
+            // console.log('da1:', da1, 'da2:', da2);
+            if (da1 > 0 && da2 > 0) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+
+    render(ctx) {
+        const view = globalView();
+        const center = view.project(Vec2.zero());
+        ctx.strokeStyle = Color.PulseColor.to_string();
+        ctx.beginPath();
+        ctx.arc(center.x, center.y, this.radius, -this.angle0, -this.angle1, true);
+        ctx.stroke();
+    }
+
+    update(dt) {
+        if (this[this.state]) {
+            this[this.state](dt);
+        }
+    }
+
+    intensity = 0;
+    launch_intensity = 2;
+
+    state_birth(dt) {
+        this.intensity += dt;
+        if (this.intensity > this.launch_intensity) {
+            this.state = 'state_growing';
+        }
+    }
+
+    state_growing(dt) {
+        this.radius += this.velocity * dt;
+        if (this.radius > this.maxradius) {
+            this.state = 'state_dying';
+        }
+    }
+
+    state_dying(dt) {
+        cosmos.dissipate(this.energy);
+        this.state = 'state_dead';
+    }
+
+    state_dead(dt) {
+    }
+
+    is_alive() {
+        return this.state !== 'state_dead';
+    }
+}
+
+window.Pulse = Pulse;