From 58952cfa88c0702ad42dc4b44b5ed3ea1b69b5e0 Mon Sep 17 00:00:00 2001
From: Catalin Constantin Mititiuc <webdevcat@proton.me>
Date: Sun, 14 Dec 2025 21:58:14 -0800
Subject: [PATCH] Add rotating gun

---
 html/images/tanks.svg | 231 ++++++++----------------------------------
 1 file changed, 40 insertions(+), 191 deletions(-)

diff --git a/html/images/tanks.svg b/html/images/tanks.svg
index be52543..a6aaf50 100644
--- a/html/images/tanks.svg
+++ b/html/images/tanks.svg
@@ -52,9 +52,9 @@
     <rect id="bg" x="-200" y="-150" width="400" height="300"/>
     <g class="hitbox">
       <g class="tank">
-        <!-- <line x1="0" y1="0" x2="0" y2="10" stroke="black"/> -->
         <!-- <rect width="15" height="10"/> -->
         <circle cx="0" cy="0" r="5"/>
+        <line x1="0" y1="0" x2="0" y2="8" stroke="black"/>
       </g>
     </g>
     <!-- <g id="crosshair"> -->
@@ -72,21 +72,31 @@
     <button id="move-backward" xmlns="http://www.w3.org/1999/xhtml">Up</button>
     <button id="move-forward" xmlns="http://www.w3.org/1999/xhtml">Down</button>
     <button id="turn-right" xmlns="http://www.w3.org/1999/xhtml">Right</button>
+    <button id="rotate-ccw" xmlns="http://www.w3.org/1999/xhtml">Rotate CCW</button>
+    <button id="rotate-cw" xmlns="http://www.w3.org/1999/xhtml">Rotate CW</button>
   </foreignObject>
 
   <script type="text/javascript">//<![CDATA[
     const rules = document.styleSheets[0].cssRules;
     const tank = document.querySelector(".tank");
+    const gun = tank.querySelector('line');
     const hitbox = document.querySelector(".hitbox");
     const leftTurnButton = document.querySelector("#turn-left");
     const rightTurnButton = document.querySelector("#turn-right");
     const reverseMoveButton = document.querySelector("#move-backward");
     const forwardMoveButton = document.querySelector("#move-forward");
+
+    const rotateCWButton = document.querySelector("#rotate-cw");
+    const rotateCCWButton = document.querySelector("#rotate-ccw");
+
     const fps = document.querySelector("#fps");
     let velocity = [0, 0]; // meters per second
     let acceleration = [0, 0]; // meters per second per second
     let previous, zero, frameCount = 0;
     let friction = 7.5;
+    let rotate = 0;
+    let rotationSpeed = 0.25;
+    gun.style.transform = "rotate(0deg)";
 
     requestAnimationFrame(firstFrame);
 
@@ -109,6 +119,13 @@
         frameCount++;
       }
 
+      const degsRegex = /(-?\d*\.{0,1}\d+)deg/g;
+
+      let [[, degrees]] = [...gun.style.transform.matchAll(degsRegex)];
+
+      if (rotate > 0) gun.style.transform = `rotate(${(+degrees + rotationSpeed * elapsed) % 360}deg)`;
+      else if (rotate < 0) gun.style.transform = `rotate(${(+degrees - rotationSpeed * elapsed) % 360}deg)`;
+
       let [velocityX, velocityY] = velocity;
       let [accelerationX, accelerationY] = acceleration;
 
@@ -155,226 +172,58 @@
       // if (velocity[1] < 0)
     }
 
-    function moveTank(el) {
-      const tankMove = el.animate(
-        [
-          { transform: `translate(0, -10px)`},
-          { transform: `translate(0, 10px)`}
-        ], {
-          duration: 1000,
-          fill: 'both'
-        }
-      );
-      tankMove.pause();
-      tankMove.currentTime = tankMove.effect.getComputedTiming().activeDuration / 2;
-
-      return tankMove;
-    }
-
-    function turnTank(el) {
-      const tankTurn = el.animate(
-        [
-          { transform: 'rotate(180deg)' },
-          { transform: 'rotate(-180deg)' }
-        ], {
-          duration: 2000,
-          easint: 'ease-in-out',
-          fill: 'both'
-        }
-      );
-
-      tankTurn.pause();
-      tankTurn.currentTime = tankTurn.effect.getComputedTiming().activeDuration / 2;
-
-      return tankTurn;
-    }
-
-    // const tankTurn = turnTank(tank);
-    // const tankMove = moveTank(hitbox);
-
-    function degsToRads(degrees) {
-      return degrees * Math.PI / 180;
-    }
-
-    function afterTurn() {
-      const totalDegrees = 180;
-      const current = tankTurn.currentTime;
-      const duration = tankTurn.effect.getComputedTiming().activeDuration / 2;
-      const diff = current - duration;
-      const degrees = diff / duration * totalDegrees;
-      const radians = degsToRads(degrees);
-      // https://stackoverflow.com/a/3644302
-      const y = 10 * +Math.cos(radians).toFixed(15);
-      const x = 10 * +Math.sin(radians).toFixed(15);
-
-      console.log("diff", diff, "current", current, "duration", duration, diff / duration * Math.PI);
-
-      console.log("degrees", degrees, "radians", radians, "x", x == 0, "y", y);
-
-      const regex = /(-?\d*\.{0,1}\d+)px/g;
-      const [past, future] = tankMove.effect.getKeyframes()
-
-      const def = ["0px", "0"];
-      const [[, px], [, py] = def] = [...past.transform.matchAll(regex)];
-      const [[, fx], [, fy] = def] = [...future.transform.matchAll(regex)];
-
-      const position = { x: (+fx + +px) / 2, y: (+fy + +py) / 2 };
-
-      tankMove.effect.setKeyframes(
-        [
-          { transform: `translate(${-x + position.x}px, ${-y + position.y}px)`},
-          { transform: `translate(${x + position.x}px, ${y + position.y}px)`}
-        ], {
-          duration: 5000,
-          fill: 'both'
-        }
-      );
-
-      const [pkf, fkf] = tankMove.effect.getKeyframes();
-      console.log(pkf.transform, fkf.transform);
-    }
-
-    function afterMove() {
-      const totalDistance = 10;
-      const current = tankMove.currentTime;
-      const duration = tankMove.effect.getComputedTiming().activeDuration / 2;
-      const regex = /(-?\d*\.{0,1}\d+)px/g;
-      const [past, future] = tankMove.effect.getKeyframes()
-
-      const totalDegrees = 180;
-      const turnCurrent = tankTurn.currentTime;
-      const turnDuration = tankTurn.effect.getComputedTiming().activeDuration / 2;
-      // const diff = turnDuration - turnCurrent;
-      const diff = turnCurrent - turnDuration;
-      const degrees = diff / turnDuration * totalDegrees;
-      const radians = degsToRads(degrees);
-
-      const def = ["0px", "0"];
-      const [[, px], [, py] = def] = [...past.transform.matchAll(regex)];
-      const [[, fx], [, fy] = def] = [...future.transform.matchAll(regex)];
-
-      const timeSpan = Math.abs(duration - current);
-      // const timeSpan = duration - current;
-      const distanceTraveled = timeSpan / duration * totalDistance;
-      let y = distanceTraveled * +Math.cos(radians).toFixed(15) * tankMove.playbackRate;
-      let x = distanceTraveled * +Math.sin(radians).toFixed(15) * tankMove.playbackRate;
-
-      // console.log("distanceTraveled", distanceTraveled);
-
-      if (degrees > 0 && degrees < 90) {
-        // quadrant 1
-        console.log("quadrant 1");
-        x = -x;
-        y = -y;
-      } else if (degrees > 90 && degrees < 180) {
-        // quadrant 2
-        console.log("quadrant 2");
-        x = -x;
-        y = -y;
-      } else if (degrees < -90 && degrees > -180) {
-        // quadrant 3
-        console.log("quadrant 3");
-        x = -x;
-        y = -y;
-      } else if (degrees < 0 && degrees > -90) {
-        // quadrant 4
-        console.log("quadrant 4");
-        x = -x;
-        y = -y;
-      } else if (degrees === 0) {
-        x = +x;
-        y = -y;
-      } else if (degrees === 90) {
-        x = +x;
-        y = +y;
-      } else if (degrees === -90) {
-        x = -x;
-        y = +y;
-      } else {
-        x = +x;
-        y = -y;
-      }
-
-      const position = { x: (+fx + +px) / 2, y: (+fy + +py) / 2};
-      const [turnPast, turnFuture] = tankTurn.effect.getKeyframes()
-
-      // console.log("playbackRate", tankMove.playbackRate);
-      // console.log("before", past.transform, future.transform);
-      // console.log("position", position, "degrees", degrees, "x", x, "y", y);
-
-      // can get transformation matrix
-      // getComputedStyle(hitbox).transform
-
-      tankMove.effect.setKeyframes(
-        [
-          { transform: `translate(${-x + +px}px, ${-y + +py}px)`},
-          { transform: `translate(${-x + +fx}px, ${-y + +fy}px)`}
-        ], {
-          duration: 5000,
-          fill: 'both'
-        }
-      );
-      tankMove.currentTime = duration;
-
-      const [pkf, fkf] = tankMove.effect.getKeyframes()
-      // console.log("after", pkf.transform, fkf.transform);
-    }
-
     let force = 10;
 
     leftTurnButton.addEventListener("mousedown", function (e) {
       acceleration[0] = -force;
-      // tankTurn.playbackRate = 1;
-      // tankTurn.play();
     });
 
     leftTurnButton.addEventListener("mouseup", function (e) {
       acceleration[0] = 0;
-
-      // tankTurn.pause();
-      // afterTurn();
     });
 
     rightTurnButton.addEventListener("mousedown", function (e) {
       acceleration[0] = force;
-
-      // tankTurn.playbackRate = -1;
-      // tankTurn.play();
     });
 
     rightTurnButton.addEventListener("mouseup", function (e) {
       acceleration[0] = 0;
-
-      // tankTurn.pause();
-      // afterTurn();
     });
 
     reverseMoveButton.addEventListener("mousedown", function (e) {
-      acceleration[1] = -force; // meters per second per second
-
-      // tankMove.playbackRate = -1;
-      // tankMove.play();
+      acceleration[1] = -force;
     });
 
     reverseMoveButton.addEventListener("mouseup", function (e) {
-      acceleration[1] = 0; // meters per second per second
-
-      // tankMove.pause();
-      // afterMove();
+      acceleration[1] = 0;
     });
 
     forwardMoveButton.addEventListener("mousedown", function (e) {
-      // tankMove.playbackRate = 1;
-      // tankMove.play();
-      acceleration[1] = force; // meters per second per second
+      acceleration[1] = force;
     });
 
     forwardMoveButton.addEventListener("mouseup", function (e) {
-      // tankMove.pause();
-      // afterMove();
-      acceleration[1] = 0; // meters per second per second
+      acceleration[1] = 0;
     });
 
+    rotateCWButton.addEventListener("mousedown", function (e) {
+      rotate = 1;
+    });
+
+    rotateCWButton.addEventListener("mouseup", function (e) {
+      rotate = 0;
+    });
+
+    rotateCCWButton.addEventListener("mousedown", function (e) {
+      rotate = -1;
+    });
+
+    rotateCCWButton.addEventListener("mouseup", function (e) {
+      rotate = 0;
+    });
+
+
+
     // tankTurn.addEventListener("finish", function (e) {
     //   const duration = tankTurn.effect.getComputedTiming().activeDuration;
     //   tankTurn.currentTime = tankTurn.currentTime > 0 ? 0 : duration;