I kind of new to making games been doing it for a few months and want to make games in a browser so I took the w3schools game example and I'm trying to add on to the game until I make a recreation of flappy birds
So the problem I'm having is when adding in the "Skyhigh" function its not working I was trying to change the x and y the game freaks out so I just left it as the "Rockbottom" one I want to know how I would make the "Skyhigh" function to work and add a roof
Code
<!DOCTYPE html> <html> <head> <meta name="viewport" content="width=device-width, initial-scale=1.0"/> <style> canvas { border:1px solid #d3d3d3; background-color: #f1f1f1; } </style> </head> <body onload="startGame()"> <script> var myGamePiece; var myObstacles = []; var myScore; function startGame() { myGamePiece = new component(30, 30, "red", 10, 120); myGamePiece.gravity = 0.05; myScore = new component("30px", "Consolas", "black", 280, 40, "text"); myGameArea.start(); } var myGameArea = { canvas : document.createElement("canvas"), start : function() { this.canvas.width = 480; this.canvas.height = 270; this.context = this.canvas.getContext("2d"); document.body.insertBefore(this.canvas, document.body.childNodes[0]); this.frameNo = 0; updateGameArea(); }, clear : function() { this.context.clearRect(0, 0, this.canvas.width, this.canvas.height); } } function component(width, height, color, x, y, type) { this.type = type; this.score = 0; this.width = width; this.height = height; this.speedX = 0; this.speedY = 0; this.x = x; this.y = y; this.gravity = 0; this.gravitySpeed = 0; this.update = function() { ctx = myGameArea.context; if (this.type == "text") { ctx.font = this.width + " " + this.height; ctx.fillStyle = color; ctx.fillText(this.text, this.x, this.y); } else { ctx.fillStyle = color; ctx.fillRect(this.x, this.y, this.width, this.height); } } this.newPos = function() { this.gravitySpeed += this.gravity; this.x += this.speedX; this.y += this.speedY + this.gravitySpeed; this.hitBottom(); this.hitTop(); } this.hitBottom = function() { var rockbottom = myGameArea.canvas.height - this.height; if (this.y > rockbottom) { this.y = rockbottom; this.gravitySpeed = 0; } this.hitTop = function() { var skyhigh = myGameArea.canvas.height - this.height; if (this.y > skyhigh) { this.y = skyhigh; this.gravitySpeed = 0; } } this.crashWith = function(otherobj) { var myleft = this.x; var myright = this.x + (this.width); var mytop = this.y; var mybottom = this.y + (this.height); var otherleft = otherobj.x; var otherright = otherobj.x + (otherobj.width); var othertop = otherobj.y; var otherbottom = otherobj.y + (otherobj.height); var crash = true; if ((mybottom < othertop) || (mytop > otherbottom) || (myright < otherleft) || (myleft > otherright)) { crash = false; } return crash; } } function updateGameArea() { var x, height, gap, minHeight, maxHeight, minGap, maxGap; for (i = 0; i < myObstacles.length; i += 1) { if (myGamePiece.crashWith(myObstacles[i])) { return; } } myGameArea.clear(); myGameArea.frameNo += 1; if (myGameArea.frameNo == 1 || everyinterval(150)) { x = myGameArea.canvas.width; minHeight = 20; maxHeight = 200; height = Math.floor(Math.random()*(maxHeight-minHeight+1)+minHeight); minGap = 50; maxGap = 200; gap = Math.floor(Math.random()*(maxGap-minGap+1)+minGap); myObstacles.push(new component(10, height, "green", x, 0)); myObstacles.push(new component(10, x - height - gap, "green", x, height + gap)); } for (i = 0; i < myObstacles.length; i += 1) { myObstacles[i].x += -1; myObstacles[i].update(); } myScore.text="SCORE: " + myGameArea.frameNo; myScore.update(); myGamePiece.newPos(); myGamePiece.update(); } function everyinterval(n) { if ((myGameArea.frameNo / n) % 1 == 0) {return true;} return false; } function accelerate(n) { if (!myGameArea.interval) {myGameArea.interval = setInterval(updateGameArea, 20);} myGamePiece.gravity = n; } </script> <br> <button onmousedown="accelerate(-0.2)" onmouseup="accelerate(0.05)">ACCELERATE</button> <p>Click the ACCELERATE button to start the game</p> <p>How long can you stay alive? Use the ACCELERATE button to stay in the air..</p> </body> </html> 
