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breakout_8.js

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+// JAVASCRIPT-8: MOUSE CONTROL & BRICK SHADING, ANIMATIONFRAME
+// © 2018, wbamberg
+var canvas = document.getElementById("myCanvas");
+var ctx = canvas.getContext("2d");
+var ballRadius = 12;
+var x = ballRadius;
+var y = Math.random() * (canvas.height - 2*ballRadius) + ballRadius;;
+var dx = 2;
+var dy = -2;
+var paddleHeight = 100;
+var paddleWidth = 12;
+var paddleY = (canvas.height-paddleHeight)/2;
+var downPressed = false;
+var upPressed = false;
+var score = 0;
+var brickRowCount = 5;
+var brickColumnCount = 4;
+var brickWidth = 25;
+var brickHeight = 60;
+var brickPadding = 10;
+var brickOffsetTop = 30;
+var brickOffsetLeft = 400;
+var bricks = [];
+for(var c=0; c<brickColumnCount; c++) {
+    bricks[c] = [];
+    for(var r=0; r<brickRowCount; r++) {
+        bricks[c][r] = { x: 0, y: 0, visible: 1 };
+    }
+}
+
+function keyDownHandler(e) {
+    if(e.key == "Down" || e.key == "ArrowDown") {
+        downPressed = true;
+    }
+    else if(e.key == "Up" || e.key == "ArrowUp") {
+        upPressed = true;
+    }
+}
+
+function keyUpHandler(e) {
+    if(e.key == "Down" || e.key == "ArrowDown") {
+        downPressed = false;
+    }
+    else if(e.key == "Up" || e.key == "ArrowUp") {
+        upPressed = false;
+    }
+}
+
+function mouseMoveHandler(e) {
+    var relativeY = e.clientY - canvas.offsetTop;
+    if(relativeY > 0 && relativeY < canvas.height) {
+        paddleY = relativeY - paddleHeight/2;
+    }
+}
+
+function collisionDetection() {
+    for(var c=0; c<brickColumnCount; c++) {
+        for(var r=0; r<brickRowCount; r++) {
+            var b = bricks[c][r];
+            if(b.visible == 1) {
+                if(x > b.x && x < b.x+brickWidth && y > b.y && y < b.y+brickHeight) {
+                    dy = -dy;
+                    b.visible = 0;
+                    score += c+1;
+                    if(score == 50) {
+                        alert("Congratulations, you win!\nScore: " + score);
+                        document.location.reload();
+                    }
+                }
+            }
+        }
+    }
+}
+
+function drawBall() {
+    ctx.beginPath();
+    ctx.arc(x, y, ballRadius, 0, 2 * Math.PI);
+    ctx.fillStyle = "#FF0000";
+    ctx.fill();
+    ctx.closePath();
+}
+function drawPaddle() {
+    ctx.beginPath();
+    ctx.rect(0, paddleY, paddleWidth, paddleHeight);
+    ctx.fillStyle = "#333";
+    ctx.fill();
+    ctx.closePath();
+}
+
+function drawBricks() {
+    var brickColor = ["#0095DD", "#0088BB", "#007799", "#006677"];
+    for(var c=0; c<brickColumnCount; c++) {
+        for(var r=0; r<brickRowCount; r++) {
+            if(bricks[c][r].visible == 1) {
+                var brickX = (c*(brickWidth+brickPadding))+brickOffsetLeft;
+                var brickY = (r*(brickHeight+brickPadding))+brickOffsetTop;
+                bricks[c][r].x = brickX;
+                bricks[c][r].y = brickY;
+                ctx.beginPath();
+                ctx.rect(brickX, brickY, brickWidth, brickHeight);
+                ctx.fillStyle = brickColor[c];
+                ctx.fill();
+                ctx.closePath();
+            }    
+        }
+    }
+}
+
+function drawScore() {
+    ctx.font = "16px Arial";
+    ctx.fillStyle = "#0077bb";
+    ctx.fillText("Score: "+score, 20, 20);
+}
+
+function draw() {
+    ctx.clearRect(0, 0, canvas.width, canvas.height);
+    drawBall();
+    drawPaddle();
+    drawBricks();
+    collisionDetection();
+    drawScore();
+    
+    if(x + dx > canvas.width-ballRadius) {
+        dx = -dx;
+    }
+    else if (x + dx < ballRadius) {
+        if (y > paddleY && y < paddleY + paddleHeight) {
+            dx = -dx;
+        }
+        else {
+            alert("GAME OVER");
+            document.location.reload();
+        }
+    }
+    if(y + dy > canvas.height-ballRadius || y + dy < ballRadius) {
+        dy = -dy;
+    }
+    if(downPressed && paddleY < canvas.height-paddleHeight) {
+        paddleY += 4;
+    }
+    else if(upPressed && paddleY > 4) {
+        paddleY -= 4;
+    }
+    
+    x += dx;
+    y += dy;
+    requestAnimationFrame(draw);
+}
+
+document.addEventListener("keydown", keyDownHandler, false);
+document.addEventListener("keyup", keyUpHandler, false);
+document.addEventListener("mousemove", mouseMoveHandler, false);
+draw();