控制移动PictureBox

Question

所以，我被塞在我的移动图片盒上；在我的表格2加载图片框开始移动的时候，这正是我想要的，但是它不在我的控制中，这就是我想要做的，但是我想要的是failed.....All，我想要的是由keys......Thanks控制的运动图片框的方向。

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

namespace WindowsFormsApplication1
{
    public partial class Form2 : Form
    {

        public Form2()
        {
            InitializeComponent();
        }

        private void Form2_Load(object sender, EventArgs e)
        {
            timer1.Start();
        }

        private void Form2_KeyDown(object sender, KeyEventArgs e)
        {
            if (e.KeyCode == Keys.Right) 
            {
                pictureBox1.Location = new Point(pictureBox1.Location.X + 5, pictureBox1.Location.Y);
            }

            if (e.KeyCode == Keys.Up)
            {
                pictureBox1.Location = new Point(pictureBox1.Location.X, pictureBox1.Location.Y - 5);
            }

            if (e.KeyCode == Keys.Left)
            {
                pictureBox1.Location = new Point(pictureBox1.Location.X - 5, pictureBox1.Location.Y);
            }

            if (e.KeyCode == Keys.Down)
            {
                pictureBox1.Location = new Point(pictureBox1.Location.X, pictureBox1.Location.Y + 5);
            }

        }

        private void timer1_Tick(object sender, EventArgs e)
        {

           pictureBox1.Location = new Point(pictureBox1.Location.X + 25, pictureBox1.Location.Y);
        }

        private void pictureBox1_Click(object sender, EventArgs e)
        {

        }

    }
}

Answer 1

您需要一个变量来指示方框移动的方向：

    private enum Direction { None, Left, Right, Up, Down };
    private Direction currentDir = Direction.None;

计时器的滴答事件需要检查这个变量，以知道向哪个方向移动方框：

    private void timer1_Tick(object sender, EventArgs e) {
        int vel = 5;
        switch (currentDir) {
            case Direction.Left:  pictureBox1.Left -= Math.Min(vel, pictureBox1.Left); break;
            case Direction.Right: pictureBox1.Left += Math.Min(vel, this.ClientSize.Width - pictureBox1.Right); break;
            case Direction.Up:    pictureBox1.Top  -= Math.Min(vel, pictureBox1.Top); break;
            case Direction.Down:  pictureBox1.Top  += Math.Min(vel, this.ClientSize.Height - pictureBox1.Bottom); break;
        }
    }

您的KeyDown事件处理程序应该简单地设置变量：

    private void Form1_KeyDown(object sender, KeyEventArgs e) {
        switch (e.KeyData) {
            case Keys.Left:  currentDir = Direction.Left; break;
            case Keys.Right: currentDir = Direction.Right; break;
            case Keys.Up:    currentDir = Direction.Up; break;
            case Keys.Down:  currentDir = Direction.Down; break;
        }
    }

您还需要KeyUp事件，它应该停止再次移动框：

    private void Form1_KeyUp(object sender, KeyEventArgs e) {
        switch (e.KeyData) {
            case Keys.Left:  if (currentDir == Direction.Left)  currentDir = Direction.None; break;
            case Keys.Right: if (currentDir == Direction.Right) currentDir = Direction.None; break;
            case Keys.Up:    if (currentDir == Direction.Up)    currentDir = Direction.None; break;
            case Keys.Down:  if (currentDir == Direction.Down)  currentDir = Direction.None; break;
        }
    }

Answer 2

计时器事件是在UI线程上引发的，因此键按事件被捕获得不够快。

在后台线程上运行计时器，它应该可以工作。请记住，计时器随后将进行跨线程调用，因此您需要使用Control.InvokeRequired。