C# - コントロールとグラフィックス: 見栄えをよくする(ダブルバッファリング, フォーム、レンダラ、タイマー)

Head First C#
頭とからだで覚えるC#の基本
(オライリージャパン)
Andrew Stellman (著), Jennifer Green (著)
佐藤 嘉一 (監修), 木下 哲也 (翻訳)

開発環境

• Microsoft Windows 8.1 Pro (VMware Fusion 6, OS X Mavericks - Apple) (OS)
• C# (プログラミング言語)
• Microsoft Visual Studio Express 2013 for Windows Desktop (統合開発環境, IDE)

Head First C#―頭とからだで覚えるC#の基本 (Andrew Stellman (著)、Jennifer Green (著)、佐藤 嘉一 (監修)、木下 哲也 (翻訳)、オライリージャパン)の10章(コントロールとグラフィックス: 見栄えをよくする)、エクササイズ(p.458)を解いてみる。

エクササイズ(p.458)

コード

Renderer.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Drawing;

namespace _3_Beehive_Simulator__controls_
{
    public class Renderer
    {
        private World world;
        private HiveForm hiveForm;
        private FieldForm fieldForm;

        Bitmap hiveInside;
        Bitmap hiveOutside;
        Bitmap flower;
        Bitmap[] beeAnimationLarge = new Bitmap[4];
        Bitmap[] beeAnimationSmall = new Bitmap[4];

        private List<Flower> deadFlowers = new List<Flower>();

        private List<Bee> retiredBees = new List<Bee>();

        public Renderer(World world, HiveForm hiveForm, FieldForm fieldForm)
        {
            this.world = world;
            this.hiveForm = hiveForm;
            this.fieldForm = fieldForm;
            InitializeImages();
        }

        public static Bitmap ResizeImage(Bitmap picture, int width, int height)
        {
            Bitmap resizedPicture = new Bitmap(width, height);
            using (Graphics graphics = Graphics.FromImage(resizedPicture))
            {
                graphics.DrawImage(picture, 0, 0, width, height);
            }
            return resizedPicture;
        }
        private int cell = 0;
        private int frame = 0;

        public void AnimateBees()
        {
            frame++;
            if (frame >= 6)
                frame = 0;
            switch (frame)
            {
                case 0: cell = 0; break;
                case 1: cell = 1; break;
                case 2: cell = 2; break;
                case 3: cell = 3; break;
                case 4: cell = 2; break;
                case 5: cell = 1; break;
                default: cell = 0; break;
            }
            hiveForm.Invalidate();
            fieldForm.Invalidate();
        }
        private void InitializeImages()
        {
            Image[] images = {
                                  Properties.Resources.Bee_animation_1,
                                  Properties.Resources.Bee_animation_2,
                                  Properties.Resources.Bee_animation_3,
                                  Properties.Resources.Bee_animation_4
                             };
            foreach(Image image in images)
            {
                beeAnimationLarge[cell] = new Bitmap(image, new Size(40, 40));
            }
            foreach(Image image in images)
            {
                beeAnimationSmall[cell] = new Bitmap(image, new Size(20, 20));
            }
            hiveInside = new Bitmap(Properties.Resources.Hive__inside_, hiveForm.ClientSize);
            hiveOutside = new Bitmap(Properties.Resources.Hive__outside_, new Size(100, 100));
            flower = new Bitmap(Properties.Resources.Flower, new Size(50, 50));
        }
        
        public void PaintHive(Graphics g)
        {
            g.FillRectangle(Brushes.SkyBlue, hiveForm.ClientRectangle);
            g.DrawImageUnscaled(hiveInside, new Point(0, 0));
            foreach (Bee bee in world.Bees)
            {
                if (bee.InsideHive)
                {
                    g.DrawImageUnscaled(beeAnimationSmall[cell], new Point(bee.Location.X, bee.Location.Y));
                }
            }
        }
        public void PaintField(Graphics g)
        {
            g.FillRectangle(Brushes.SkyBlue, new Rectangle(0, 0,
                fieldForm.ClientSize.Width, fieldForm.ClientSize.Height));
            g.FillRectangle(Brushes.Green, new Rectangle(0, fieldForm.ClientSize.Height / 2,
                fieldForm.ClientSize.Width, fieldForm.ClientSize.Height / 2));
            g.FillEllipse(Brushes.Yellow, new Rectangle(new Point(5, 5), new Size(50, 50)));
            using (Pen pen = new Pen(Brushes.Brown,5.0f))
            {
                g.DrawLine(pen, new Point(fieldForm.Width - 100, 0), new Point(fieldForm.Width - 100, 10));
            }
            g.DrawImageUnscaled(hiveOutside, new Point(fieldForm.Width - 150, 10));
            foreach (Flower f in world.Flowers)
            {
                g.DrawImageUnscaled(flower,
                    new Point(f.Location.X, f.Location.Y));
            }
            foreach (Bee bee in world.Bees)
            {
                g.DrawImageUnscaled(beeAnimationSmall[cell], new Point(bee.Location.X, bee.Location.Y));
            }
        }
    }
}