Camera implemented.

js/Camera.js

@@ -0,0 +1,60 @@
+import GeometryPoint from "./geometry/GeometryPoint.js";
+
+export default class Camera
+{
+    constructor(x = 0, y = 0, width = window.innerWidth, height = window.innerHeight)
+    {
+        this.position = new GeometryPoint(x, y);
+        this.width = width;
+        this.height = height;
+        this.borderTop = 0;
+        this.borderBottom = undefined;
+        this.borderLeft = 0;
+        this.borderRight = undefined;
+        this.speedX = 0;
+        this.speedY = 0;
+    }
+
+    centerCamera(x, y)
+    {
+        this.position.x = x - this.width * 0.5;
+        this.position.y = y - this.height * 0.5;
+
+        if (this.position.x < this.borderLeft) {
+            this.position.x = this.borderLeft;
+        } else if (this.borderRight !== undefined && this.position.x + this.width > this.borderRight) {
+            this.position.x = this.borderRight - this.width;
+        }
+
+        if (this.position.y < this.borderTop) {
+            this.position.y = this.borderTop;
+        } else if (this.borderBottom !== undefined && this.position.y + this.height > this.borderBottom) {
+            this.position.y = this.borderBottom - this.height;
+        }
+    }
+
+    facePosition(x, y, delta, reactionSpeed = 1)
+    {
+        let positionX = x - this.width * 0.5;
+        let positionY = y - this.height * 0.5;
+
+        let distanceX = this.position.x - positionX;
+        let distanceY = this.position.y - positionY;
+
+        if (this.position.x !== positionX) {
+            this.position.x += distanceX * delta * reactionSpeed;
+        }
+
+        if (distanceX < 0.01) {
+            this.position.x = positionX;
+        }
+
+        if (this.position.y !== positionY) {
+            this.position.y += distanceY * delta * reactionSpeed;
+        }
+
+        if (distanceY < 0.01) {
+            this.position.y = positionY;
+        }
+    }
+}

js/Movable.js

@@ -40,6 +40,14 @@ export default class Movable
         return this.animations[this.currentAnimation].getRect();
     }
 
+    getCenter()
+    {
+        return new GeometryPoint(
+            this.position.x + this.getWidth() * 0.5,
+            this.position.y + this.getHeight() * 0.5
+        );
+    }
+
     getWidth()
     {
         return this.getRect().width;
@@ -99,9 +107,9 @@ export default class Movable
         this.position.y = height - this.animations[this.currentAnimation].getHeight();
     }
 
-    draw(context)
+    draw(context, camera)
     {
         this.animations[this.currentAnimation].setFootPosition(this.position.x, this.position.y);
-        this.animations[this.currentAnimation].draw(context);
+        this.animations[this.currentAnimation].draw(context, camera);
     }
 }

js/module.js

@@ -2,6 +2,7 @@ import Key from "./Key.js";
 import MrCroc from "./MrCroc.js";
 import RetroArchitecture from "./retro/RetroArchitecture.js";
 import FileLoader from "./FileLoader.js";
+import Camera from "./Camera.js";
 
 class ImageLoader
 {
@@ -104,8 +105,10 @@ function MainLoop(timestamp)
     /* Drawing */
     if (timestamp - lastRendered >= FRAME_DURATION) {
         context.clearRect(0, 0, window.innerWidth, window.innerHeight);
-        architecture.draw(context);
-        mrCroc.draw(context);
+
+        camera.centerCamera(mrCroc.position.x - mrCroc.getWidth() * 0.5, mrCroc.position.y - mrCroc.getHeight() * 0.5);
+        architecture.draw(context, camera);
+        mrCroc.draw(context, camera);
 
         /*
         context.fillRect(0, ceilingHeight, window.innerWidth, 1);
@@ -133,7 +136,7 @@ const FRAME_DURATION = 1000 / FPS;
 const GAME_SPEED = 1;
 const GRAVITY = 2;
 
-let levelJson = new FileLoader('levels/test_startpoint.json');
+let levelJson = new FileLoader('levels/test_depth.json');
 
 const LEVEL = JSON.parse(levelJson.getContent());
 
@@ -141,6 +144,7 @@ let lastRendered = undefined;
 let lastTimestamp = undefined;
 let context;
 let mrCroc, architecture;
+let camera = new Camera();
 
 let KeyLeft = new Key('ArrowLeft');
 let KeyRight = new Key('ArrowRight');
@@ -178,6 +182,8 @@ window.addEventListener(
         context = canvas.getContext('2d');
 
         architecture = RetroArchitecture.createFromData(LEVEL);
+        camera.borderRight = architecture.columns * architecture.tileWidth;
+        camera.borderBottom = architecture.rows * architecture.tileHeight;
 
         mrCroc = new MrCroc();
         mrCroc.position.x = architecture.tileWidth * LEVEL.startX + architecture.tileWidth * 0.5;

js/retro/RetroAnimation.js

@@ -42,7 +42,7 @@ export default class RetroAnimation extends RetroSprite
         }
     }
 
-    draw(context)
+    draw(context, camera)
     {
         if (!this.isPlaying) {
             this.currentFrame = 0;
@@ -54,8 +54,8 @@ export default class RetroAnimation extends RetroSprite
             0,
             this.frameWidth,
             this.canvas.height,
-            this.position.x,
-            this.position.y,
+            this.position.x - camera.position.x,
+            this.position.y - camera.position.y,
             this.frameWidth,
             this.canvas.height
         );

js/retro/RetroArchitecture.js

@@ -140,10 +140,15 @@ export default class RetroArchitecture
         return 0;
     }
 
-    draw(context)
+    draw(context, camera = null)
     {
-        for (let y = 0; y < this.rows; y++) {
-            for (let x = 0; x < this.columns; x++) {
+        let viewX = parseInt(Math.floor(Math.max(0, camera.position.x) / this.tileWidth));
+        let viewWidth = parseInt(Math.min(Math.ceil(camera.width), this.columns));
+        let viewY = parseInt(Math.floor(Math.max(0, camera.position.y)) / this.tileHeight);
+        let viewHeight = parseInt(Math.min(Math.ceil(camera.height), this.rows));
+
+        for (let y = viewY; y < viewHeight; y++) {
+            for (let x = viewX; x < viewWidth; x++) {
                 let field = this.matrix[y][x];
 
                 if (field !== null) {
@@ -153,8 +158,8 @@ export default class RetroArchitecture
                         0,
                         this.tileWidth,
                         this.tileHeight,
-                        x * this.tileWidth,
-                        y * this.tileHeight,
+                        x * this.tileWidth - camera.position.x,
+                        y * this.tileHeight - camera.position.y,
                         this.tileWidth,
                         this.tileHeight
                     );

js/retro/RetroSprite.js

@@ -61,9 +61,9 @@ export default class RetroSprite
         return new GeometryPoint(this.position.x + this.getWidth() * 0.5, this.position.y);
     }
 
-    draw(context)
+    draw(context, camera)
     {
-        context.drawImage(this.canvas, this.position.x, this.position.y);
+        context.drawImage(this.canvas, this.position.x - camera.position.x, this.position.y - camera.position.y);
     }
 
     hasRectCollisionWith(sprite)