From 034d9301fdd5cc70648e2cd9a6ae202b89eebe39 Mon Sep 17 00:00:00 2001
From: Syndamia <kamen@syndamia.com>
Date: Sun, 27 Aug 2023 16:03:21 +0300
Subject: [WGL/P] Animation can now depend on time and changed first level so
 sun moves back and forth

---
 Year 2/Computer Graphics with WebGL/Project/Project.html | 5 ++++-
 Year 2/Computer Graphics with WebGL/Project/level.js     | 6 +++---
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/Year 2/Computer Graphics with WebGL/Project/Project.html b/Year 2/Computer Graphics with WebGL/Project/Project.html
index 202b01c..c4d090c 100644
--- a/Year 2/Computer Graphics with WebGL/Project/Project.html	
+++ b/Year 2/Computer Graphics with WebGL/Project/Project.html	
@@ -124,15 +124,18 @@ h2 {
 		window.onresize = resizeglcanvas;
 	
 		var pauseAnimations = false;
+		var startT = -1;
 		function drawFrame()
 		{
+			if (startT == -1) startT = Date.now();
+			var t = Math.floor(Date.now() - startT) / 10; // tenths of a second
 			gl.clear(gl.COLOR_BUFFER_BIT+gl.DEPTH_BUFFER_BIT);
 
 			updateCamera();
 			gl.uniform3fv(uEye, pos);
 
 			skybox.draw();
-			if (!pauseAnimations) animations.forEach((a) => a());
+			if (!pauseAnimations) animations.forEach((a) => a(t));
 			stars.forEach((s) => s.draw());
 
 			requestAnimationFrame(drawFrame);
diff --git a/Year 2/Computer Graphics with WebGL/Project/level.js b/Year 2/Computer Graphics with WebGL/Project/level.js
index 68eed7a..7f4120a 100644
--- a/Year 2/Computer Graphics with WebGL/Project/level.js	
+++ b/Year 2/Computer Graphics with WebGL/Project/level.js	
@@ -16,12 +16,12 @@ Level = function(name, description, cameraCoords) {
 Level.prototype.addStar = function(center, size, animation) {
 	var star = new Star(center, size);
 	this.stars.push(star);
-	if (animation) this.animations.push(() => star.moveTo(animation(star)));
+	if (animation) this.animations.push((t) => star.moveTo(animation(t, star)));
 }
 Level.prototype.addBlackHole = function(center, size, animation) {
 	var bh = new BlackHole(center, size);
 	this.blackHoles.push(bh);
-	if (animation) this.animations.push(() => bh.moveTo(animation(bh)));
+	if (animation) this.animations.push((t) => bh.moveTo(animation(t, bh)));
 }
 Level.prototype.load = function() {
 	stars = this.stars;
@@ -35,6 +35,6 @@ function createLevels() {
 		"Star passing behind black hole",
 		"You can see how the black hole (correctly) warps the light of the star behind it when it passes",
 		[1000,0,650]);
-	l1.addStar([1100,0,1000], 10, (star) => (vecSum(star.sphere.center, [-0.5,0,0])));
+	l1.addStar([1100,0,1000], 10, (t, star) => [1100 -100 * (1 + Math.sin(t/300 + 1.5 * Math.PI)),0,1000]);
 	l1.addBlackHole([1000,0,900], 30, undefined);
 }
-- 
cgit v1.3.1-23-gd82d