2D斜角地圖是一款基于HTML5技術的游戲，它的源代碼為：

let canvas = document.getElementById("canvas");
let ctx = canvas.getContext("2d");
let tileWidth = 64;
let tileHeight = 32;
let mapWidth = 20;
let mapHeight = 10;
let map = [
[1,0,1,1,1,1,0,0,0,0,1,1,1,1,1,0,0,1,1,1],
[0,0,0,1,1,0,0,0,0,0,1,1,1,0,0,0,0,1,1,1],
[0,0,0,0,1,1,0,0,0,0,1,1,0,0,0,0,1,1,1,1],
[0,0,0,0,0,1,1,0,0,0,1,1,1,0,0,0,1,1,1,0],
[0,0,0,0,0,1,1,0,0,0,1,1,1,1,0,0,0,1,1,0],
[0,0,0,0,0,1,1,0,0,0,1,1,1,0,0,0,0,1,1,1],
[0,0,0,0,0,1,1,0,0,0,1,1,0,0,0,0,1,1,0,0],
[0,0,0,0,0,0,1,1,0,0,1,0,0,0,0,1,1,1,0,0],
[0,0,0,0,0,0,0,1,1,1,0,0,0,0,1,1,1,0,0,0],
[0,0,0,0,0,0,0,0,1,1,1,1,1,1,1,0,0,0,0,0],
];
function drawRhombus(x,y,color) {
ctx.beginPath();
ctx.moveTo(x + tileWidth / 2, y);
ctx.lineTo(x, y + tileHeight / 2);
ctx.lineTo(x + tileWidth / 2, y + tileHeight);
ctx.lineTo(x + tileWidth, y + tileHeight / 2);
ctx.closePath();
ctx.fillStyle = color;
ctx.fill();
}
function drawMap() {
for (let i = 0; i< mapHeight; i++) {
for (let j = 0; j< mapWidth; j++) {
let value = map[i][j];
let x = (j - i) * tileWidth / 2 + canvas.width / 2;
let y = (i + j) * tileHeight / 2;
if (value === 1) {
drawRhombus(x,y,"#ccc");
}
}
}
}
drawMap();

本游戲使用HTML5的Canvas標簽作為游戲畫布，通過JavaScript語言控制畫布繪制地圖。其中，變量tileWidth和tileHeight表示地圖瓦片的寬高，mapWidth和mapHeight表示地圖的大小，map是一個二維數組，代表地圖中每個位置的狀況。

本游戲采用斜向的瓦片地圖，實現起來比普通的正方形瓦片地圖更加有趣。drawRhombus函數用于繪制一個斜向的菱形瓦片，通過計算每個瓦片的坐標，可以將整個地圖繪制出來。最終調用drawMap函數，實現地圖繪制。

2D斜角地圖游戲簡單而又有趣，適合初學者學習HTML5 Canvas繪圖基礎知識。