experiments/grid.html at main · Req/experiments · GitHub

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<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Gerg</title>
    <style>
      body {
        background: #000;
        display: grid;
        place-items: center;
        height: 100vh;
      }

      canvas {
        height: 400px;
        width: 400px;
        box-shadow: #9007 10px 10px 80px, #009a -10px -10px 50px,
          #009a 0px 0px 500px;
        border-radius: 0.5em;
      }

      pre {
        position: absolute;
        top: 0;
        left: 0;
        width: 500px;
        color: #ccc;
        max-height: 90vh;
        overflow: hidden;
      }
    </style>
  </head>
  <body>
    <canvas></canvas>
    <pre>
Foo
Bar
</pre
    >
    <script>
      let pre = document.querySelector("pre");
      let msgs = [];
      function log(m) {
        msgs.unshift(m);
        pre.innerText = msgs.join("\n");
        if (msgs.length > 30) {
          msgs.pop();
        }
      }

      const canvas = document.querySelector("canvas");
      const ctx = canvas.getContext("2d");

      // Define the grid size
      const rows = 10;
      const cols = 10;
      const cellWidth = canvas.width / cols;
      const cellHeight = canvas.height / rows;

      function grid() {
        ctx.strokeStyle = "#101";

        // Draw vertical lines98
        for (let i = 0; i <= cols; i++) {
          let x = i * cellWidth;
          ctx.beginPath();
          ctx.moveTo(x, 0);
          ctx.lineTo(x, canvas.height);
          ctx.stroke();
        }

        // Draw horizontal lines
        for (let i = 0; i <= rows; i++) {
          let y = i * cellHeight;
          ctx.beginPath();
          ctx.moveTo(0, y);
          ctx.lineTo(canvas.width, y);
          ctx.stroke();
        }
      }

      const char = { x: 2, y: 2 };
      document.addEventListener("keydown", (e) => {
        log("Key " + e.key)
        if (e.key === "w") {
          if (char.y > 1) char.y--;
        }
        if (e.key === "a") {
          if (char.x > 1) char.x--;
        }
        if (e.key === "s") {
          if (char.y < 10) char.y++;
        }
        if (e.key === "d") {
          if (char.x < 10) char.x++;
        }
      });

      const halfx = cellWidth / 2;
      function coordX(x) {
        return x * cellWidth - halfx;
      }

      const halfy = cellHeight / 2;
      function coordY(x) {
        return x * cellHeight - halfy;
      }

      function drawChar() {
        ctx.fillStyle = "#fee";
        ctx.beginPath();
        ctx.arc(coordX(char.x), coordY(char.y), 5, 0, Math.PI * 2); // x, y, radius, start angle, end angle
        ctx.fill(); // Or use ctx.stroke() if you want only the outline
      }

      function clear() {
        ctx.fillStyle = "#000";
        ctx.beginPath();
        ctx.clearRect(0, 0, canvas.width, canvas.height);
        ctx.fill();
      }

      log("Move with WASD");

      function tick() {
        clear();
        drawChar();
        grid();
        // requestAnimationFrame()
        setTimeout(tick, 1000 / 25);
      }

      tick();
    </script>
  </body>
</html>