由于篇幅限制，我将分别为你提供Python、JavaScript（HTML5 Canvas）和C#（Unity的简单控制台输出）三种语言的简单游戏代码示例。

由于你的问题涉及多种编程语言，我将为你提供每种语言的简要示例。

1. Python示例:

import math
 
def calculate_area(radius):
    return math.pi * (radius ** 2)
 
def calculate_circumference(radius):
    return 2 * math.pi * radius
 
radius = 5
area = calculate_area(radius)
circumference = calculate_circumference(radius)
print(f"Area: {area}")
print(f"Circumference: {circumference}")

2. JavaScript(HTML5 Canvas)示例:

<canvas id="myCanvas" width="200" height="100" style="border:1px solid #000000;"></canvas>
<script>
var canvas = document.getElementById('myCanvas');
var ctx = canvas.getContext('2d');
var radius = 25;
var centerX = 50;
var centerY = 50;
 
ctx.beginPath();
ctx.arc(centerX, centerY, radius, 0, 2 * Math.PI, false);
ctx.fillStyle = 'green';
ctx.fill();
ctx.lineWidth = 5;
ctx.strokeStyle = '#003300';
ctx.stroke();
</script>

3. C#(Unity)示例:

using UnityEngine;
 
public class CircleDrawer : MonoBehaviour
{
    public float radius = 5f;
    public Vector3 center = Vector3.zero;
 
    void OnGUI()
    {
        GUILayout.Label("Area: " + (Mathf.PI * radius * radius));
        GUILayout.Label("Circumference: " + (2 * Mathf.PI * radius));
    }
 
    void OnRenderObject()
    {
        Graphics.DrawMeshNow(GenerateCircleMesh(radius, 50), Matrix4x4.TRS(center, Quaternion.identity, Vector3.one));
    }
 
    Mesh GenerateCircleMesh(float radius, int segments)
    {
        Mesh mesh = new Mesh();
        float angleStep = 360f / segments;
        Vector3[] vertices = new Vector3[segments + 1];
        int[] triangles = new int[segments * 3];
 
        for (int i = 0; i <= segments; i++)
        {
            float angle = angleStep * i;
            vertices[i] = new Vector3(Mathf.Cos(angle * Mathf.Deg2Rad), 0, Mathf.Sin(angle * Mathf.Deg2Rad)) * radius;
        }
 
        for (int i = 0; i < segments; i++)
        {
            triangles[i * 3] = i;
            triangles[i * 3 + 1] = (i + 1) % (segments + 1);
            triangles[i * 3 + 2] = (i + 2) % (segments + 1);
        }
 
        mesh.vertices = vertices;
        mesh.triangles = triangles;
        mesh.RecalculateNormals();
 
        return mesh;
    }
}

这些示例提供了圆的面积和周长的计算，并在各自的环境中绘制了一个简单的圆形。Python示例使用了math库来计算圆的面积和周长，而HTML5 Canvas和Unity示例则是通过绘制几何体来展示圆形。