Demo : https://www.lenlop123.com/2020/09/155-control-by-mouse-cursor_24.html
<!DOCTYPE html>
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<style>
canvas {
border: 1px solid #d3d3d3;
background-color: #f1f1f1;
}
</style>
<div>
<canvas id="canvas" class="canvas"></canvas>
</div>
<script>
var myGamePiece;
// hàm onload sẽ chạy sau cùng, sau khi load đủ dữ liệu
window.onload = function () {
startGame()
};
function startGame() {
myGamePiece = new component(30, 30, "red", 10, 120); // vẽ 1 component
myGameArea.start(); // khởi tạo canvas
}
var myGameArea = {
canvas: document.getElementById('canvas'),
start: function () {
this.canvas.width = 480; // Lấy thẻ HTML Canvas
this.canvas.height = 270;
this.context = this.canvas.getContext("2d"); // Vẽ ở mô hình 2D
this.interval = setInterval(updateGameArea, 20); // Vẽ lại hình mỗi 20ms
window.addEventListener('mousemove', function (e) {
myGameArea.x = e.pageX;
myGameArea.y = e.pageY;
})
},
clear: function () {
this.context.clearRect(0, 0, this.canvas.width, this.canvas.height);
}
}
// khai báo cấu trúc 1 component và gán cho 1 biến nào đó
function component(width, height, color, x, y) {
this.width = width;
this.height = height;
this.speedX = 0;
this.speedY = 0;
this.x = x;
this.y = y;
this.update = function () {
ctx = myGameArea.context;
ctx.fillStyle = color;
ctx.fillRect(this.x, this.y, this.width, this.height);
}
}
function updateGameArea() {
myGameArea.clear();
if (myGameArea.x && myGameArea.y) {
myGamePiece.x = myGameArea.x;
myGamePiece.y = myGameArea.y;
}
myGamePiece.update();
}
</script>
<p>Move the cursor inside the canvas to move the red square.</p>
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