Head First C#の本を使ってC#を学んでいます。グレイハウンド レーシング ゲームをビルドする最初のラボで、いくつかの動作に遭遇し、コードがそのようにレンダリングされる理由がわかりません。[Race] ボタンを最初にクリックすると、馬はトラックの最後までレースをしますが、トラックの最後に到達すると前の画像が最終的に消えるまで、それぞれの後ろに前の画像の軌跡が作成されるようにレンダリングされます。[Race] ボタンを続けてクリックすると、同じことが起こりますが、現在のレースが完了するまで、フィニッシュ ラインから各犬の PictureBox を消去することもできません。
以下は、私の言いたいことを示す 19 秒の短いビデオです。
レース中に犬が「後を追う」のはなぜですか?また、次の次のレースが完了するまで、再びスタート時にレンダリングされたときにフィニッシュ ラインから消えないのはなぜですか? TakeStartingPosition()犬が再配置されると、再描画ではなく移動すると思います。と同じように、Run()新しいポジションはそれぞれ移動であり、再描画ではないと思いますが、各移動ステップで画像を再描画し、レースの最後まで古い画像を消去していないように見えます. 私は間違って何をしていますか?
グレイハウンド.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace RaceTrackSimulator
{
class Greyhound
{
public int StartingPosition;
public int RacetrackLength;
public PictureBox MyPictureBox = null;
public int Location = 0;
public Random Randomizer;
public bool Run()
{
// Move forward either 1, 2, 3 or 4 spaces at random
int moveSpaces = Randomizer.Next(1, 4);
// Update the position of my Picturebox on the form like this:
// MyPictureBox.Left = StartingPosition + Location;
MyPictureBox.Left = StartingPosition + Location;
// Return true if I won the race
if (Location >= RacetrackLength)
{
return true;
}
else
{
Location += moveSpaces;
return false;
}
}
public void TakeStartingPosition()
{
// Reset my location to 0 and my PictureBox to starting position
Location = 0;
MyPictureBox.Left = StartingPosition;
}
}
}
Form1.cs
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
namespace RaceTrackSimulator
{
public partial class Form1 : Form
{
Greyhound[] Dogs;
public Form1()
{
InitializeComponent();
Random MyRandomizer = new Random();
// Initialize Dogs
Dogs = new Greyhound[4];
Dogs[0] = new Greyhound()
{
MyPictureBox = pictureBox2,
StartingPosition = racetrackPictureBox.Left,
RacetrackLength = racetrackPictureBox.Width - pictureBox2.Width,
Randomizer = MyRandomizer
};
Dogs[1] = new Greyhound()
{
MyPictureBox = pictureBox3,
StartingPosition = racetrackPictureBox.Left,
RacetrackLength = racetrackPictureBox.Width - pictureBox3.Width,
Randomizer = MyRandomizer
};
Dogs[2] = new Greyhound()
{
MyPictureBox = pictureBox4,
StartingPosition = racetrackPictureBox.Left,
RacetrackLength = racetrackPictureBox.Width - pictureBox4.Width,
Randomizer = MyRandomizer
};
Dogs[3] = new Greyhound()
{
MyPictureBox = pictureBox5,
StartingPosition = racetrackPictureBox.Left,
RacetrackLength = racetrackPictureBox.Width - pictureBox5.Width,
Randomizer = MyRandomizer
};
}
private void raceButton_Click(object sender, EventArgs e)
{
bool winner = false;
int winningDog = 0;
for (int eachDog = 0; eachDog < Dogs.Length; eachDog++)
{
Dogs[eachDog].TakeStartingPosition();
}
while (!winner)
{
for (int i = 0; i < 4; i++)
{
if (Dogs[i].Run())
{
winner = true;
winningDog = i+1;
}
System.Threading.Thread.Sleep(1);
}
}
MessageBox.Show("Winning Dog is #" + winningDog);
}
}
}
Form1.Designer.cs
namespace RaceTrackSimulator
{
partial class Form1
{
/// <summary>
/// Required designer variable.
/// </summary>
private System.ComponentModel.IContainer components = null;
/// <summary>
/// Clean up any resources being used.
/// </summary>
/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
protected override void Dispose(bool disposing)
{
if (disposing && (components != null))
{
components.Dispose();
}
base.Dispose(disposing);
}
#region Windows Form Designer generated code
/// <summary>
/// Required method for Designer support - do not modify
/// the contents of this method with the code editor.
/// </summary>
private void InitializeComponent()
{
this.pictureBox2 = new System.Windows.Forms.PictureBox();
this.racetrackPictureBox = new System.Windows.Forms.PictureBox();
this.pictureBox3 = new System.Windows.Forms.PictureBox();
this.pictureBox4 = new System.Windows.Forms.PictureBox();
this.pictureBox5 = new System.Windows.Forms.PictureBox();
this.raceButton = new System.Windows.Forms.Button();
((System.ComponentModel.ISupportInitialize)(this.pictureBox2)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.racetrackPictureBox)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.pictureBox3)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.pictureBox4)).BeginInit();
((System.ComponentModel.ISupportInitialize)(this.pictureBox5)).BeginInit();
this.SuspendLayout();
//
// pictureBox2
//
this.pictureBox2.Image = global::RaceTrackSimulator.Properties.Resources.dog;
this.pictureBox2.Location = new System.Drawing.Point(13, 22);
this.pictureBox2.Name = "pictureBox2";
this.pictureBox2.Size = new System.Drawing.Size(75, 20);
this.pictureBox2.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
this.pictureBox2.TabIndex = 2;
this.pictureBox2.TabStop = false;
//
// racetrackPictureBox
//
this.racetrackPictureBox.Image = global::RaceTrackSimulator.Properties.Resources.racetrack;
this.racetrackPictureBox.Location = new System.Drawing.Point(13, 12);
this.racetrackPictureBox.Name = "racetrackPictureBox";
this.racetrackPictureBox.Size = new System.Drawing.Size(600, 200);
this.racetrackPictureBox.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
this.racetrackPictureBox.TabIndex = 0;
this.racetrackPictureBox.TabStop = false;
//
// pictureBox3
//
this.pictureBox3.Image = global::RaceTrackSimulator.Properties.Resources.dog;
this.pictureBox3.Location = new System.Drawing.Point(13, 74);
this.pictureBox3.Name = "pictureBox3";
this.pictureBox3.Size = new System.Drawing.Size(75, 20);
this.pictureBox3.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
this.pictureBox3.TabIndex = 3;
this.pictureBox3.TabStop = false;
//
// pictureBox4
//
this.pictureBox4.Image = global::RaceTrackSimulator.Properties.Resources.dog;
this.pictureBox4.Location = new System.Drawing.Point(13, 126);
this.pictureBox4.Name = "pictureBox4";
this.pictureBox4.Size = new System.Drawing.Size(75, 20);
this.pictureBox4.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
this.pictureBox4.TabIndex = 4;
this.pictureBox4.TabStop = false;
//
// pictureBox5
//
this.pictureBox5.Image = global::RaceTrackSimulator.Properties.Resources.dog;
this.pictureBox5.Location = new System.Drawing.Point(13, 178);
this.pictureBox5.Name = "pictureBox5";
this.pictureBox5.Size = new System.Drawing.Size(75, 20);
this.pictureBox5.SizeMode = System.Windows.Forms.PictureBoxSizeMode.AutoSize;
this.pictureBox5.TabIndex = 5;
this.pictureBox5.TabStop = false;
//
// raceButton
//
this.raceButton.Location = new System.Drawing.Point(538, 377);
this.raceButton.Name = "raceButton";
this.raceButton.Size = new System.Drawing.Size(75, 23);
this.raceButton.TabIndex = 6;
this.raceButton.Text = "RACE!";
this.raceButton.UseVisualStyleBackColor = true;
this.raceButton.Click += new System.EventHandler(this.raceButton_Click);
//
// Form1
//
this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
this.ClientSize = new System.Drawing.Size(625, 412);
this.Controls.Add(this.raceButton);
this.Controls.Add(this.pictureBox5);
this.Controls.Add(this.pictureBox4);
this.Controls.Add(this.pictureBox3);
this.Controls.Add(this.pictureBox2);
this.Controls.Add(this.racetrackPictureBox);
this.Name = "Form1";
this.Text = "Form1";
((System.ComponentModel.ISupportInitialize)(this.pictureBox2)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.racetrackPictureBox)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.pictureBox3)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.pictureBox4)).EndInit();
((System.ComponentModel.ISupportInitialize)(this.pictureBox5)).EndInit();
this.ResumeLayout(false);
this.PerformLayout();
}
#endregion
private System.Windows.Forms.PictureBox racetrackPictureBox;
private System.Windows.Forms.PictureBox pictureBox2;
private System.Windows.Forms.PictureBox pictureBox3;
private System.Windows.Forms.PictureBox pictureBox4;
private System.Windows.Forms.PictureBox pictureBox5;
private System.Windows.Forms.Button raceButton;
}
}