From 9f68ba33f3c52af34d033160d73dad4257d8c636 Mon Sep 17 00:00:00 2001
From: elliotjarnit <elliotjarnit@gmail.com>
Date: Wed, 22 Nov 2023 11:34:20 -0800
Subject: [PATCH] get fps

---
 .../elliotengine/Graphics/RenderingEngine.java      | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/main/java/dev/elliotjarnit/elliotengine/Graphics/RenderingEngine.java b/src/main/java/dev/elliotjarnit/elliotengine/Graphics/RenderingEngine.java
index 10e5068..bfc0373 100644
--- a/src/main/java/dev/elliotjarnit/elliotengine/Graphics/RenderingEngine.java
+++ b/src/main/java/dev/elliotjarnit/elliotengine/Graphics/RenderingEngine.java
@@ -17,6 +17,8 @@ public class RenderingEngine extends JPanel {
     private EScene scene;
     private EOverlay overlay;
     private final ElliotEngine engine;
+    private double lastFrameTime = System.nanoTime();
+    private int fps = 0;
 
     public RenderingEngine(ElliotEngine engine) {
         super();
@@ -29,6 +31,11 @@ public RenderingEngine(ElliotEngine engine) {
     public void paintComponent(Graphics g) {
         Graphics2D g2d = (Graphics2D) g;
 
+        // Calculate FPS
+        double currentTime = System.nanoTime();
+        fps = (int) (1 / ((currentTime - lastFrameTime) / 1000000000));
+        lastFrameTime = currentTime;
+
         // Clear screen
         g2d.setColor(scene.getSkyColor().toAwtColor());
         g2d.fillRect(0, 0, this.getWidth(), this.getHeight());
@@ -185,7 +192,11 @@ public void drawCenteredString(Graphics g, String text, Rectangle rect, Font fon
         g.drawString(text, x, y);
     }
 
-    public boolean sameSide(Vector3 A, Vector3 B, Vector3 C, Vector3 p){
+    public int getFPS() {
+        return this.fps;
+    }
+
+    private boolean sameSide(Vector3 A, Vector3 B, Vector3 C, Vector3 p){
         Vector3 V1V2 = new Vector3(B.x - A.x,B.y - A.y,B.z - A.z);
         Vector3 V1V3 = new Vector3(C.x - A.x,C.y - A.y,C.z - A.z);
         Vector3 V1P = new Vector3(p.x - A.x,p.y - A.y,p.z - A.z);