c#中如何实现图片从四角进入

Question

c#中如何实现图片从四角进入啊？我不知道那个for循环怎么写...

Answer 1

Draw有2个参数，x,y表示左上角位置，你改变一下就行了。
比如左上角进入，就是x,y不停增大
如果你不会绘图。就设置一个PictureBox控件，修改Left,Top属性。

Answer 2

我设置了，但是运行结果总是从左侧显示，不是左上角，你看看我的代码吧：
private void 左上角ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            int x, y;
            Graphics g = pictureBox1.CreateGraphics();
            g.Clear(this .BackColor );
            box = new Bitmap(pictureBox1 .Image );
            width = this.pictureBox1.Image.Width;
            height = pictureBox1.Image.Height;
            for (x = 0; x < Width; x++)
            
                {
                    g.DrawImage(box, 0, 0, x, height );
                }
            for (y = 0; y < Height; y++)
                {
                    g.DrawImage(box, 0, 0, y , width );
 
                }
        }

Answer 3

x,y同时改变…
给你写个范例，左上角进入，右下角出去的Image image = pictureBox1.Image;//记录下当前的位图
//保存当前的图片，因为下面的行为将不会触发区域无效，控件不会主动将Image属性中的图片绘制到屏幕上
Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
//创建Graphics对象，用于对bmp缓冲图片绘图
using (Graphics g = Graphics.FromImage(bmp))
{
    //创建Graphics对象，用于对PictureBox贴图
    using (Graphics gp = pictureBox1.CreateGraphics())
    {
        //记录一个值，表示width和height乘以-1的最小值，以便最初的图片在屏幕以外
        int i = -Math.Max(pictureBox1.Width, pictureBox1.Height);
        //i表示循环变量
        while (i < pictureBox1.Width || i < pictureBox1.Height)
        {
            //清理缓存图片中原有数据
            g.Clear(this.BackColor);
            //绘制PictureBox中设置的Image到缓存图上，位置每次往右下角对角线方向偏移一个像素，
            g.DrawImage(image, i, i);
            //将缓存图片更新到PictureBox控件上，目的是减少对PictureBox控件的更新次数，避免闪烁
            gp.DrawImage(bmp, 0, 0);
            i++;//自增变量
        }
    }
}
pictureBox1.Refresh();//完成后调用PictureBox控件的重绘功能还原，功能演示结束。

Answer 4

我发给你看一下吧！
C#code
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;namespace WindowsApplication1
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        int width, height;
        Bitmap box;
        private void 打开ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            openFileDialog1.Filter = "bmp文件(*.bmp)|*.bmp|JPG文件(*.jpg)|*.jpg|GIF文件(*.gif)|*.gif";
            if (openFileDialog1.ShowDialog() == DialogResult.OK)
            {
                Bitmap box = new Bitmap(openFileDialog1.FileName);
                pictureBox1.Image = box;
            }
        }        private void 保存ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            SaveFileDialog dlg = new SaveFileDialog();
            dlg.Title = "保存图片";
            dlg.OverwritePrompt = true;
            dlg.InitialDirectory = "D:\\";
            dlg.Filter = "bmp文件(*.bmp)|*.bmp|JPG文件(*.jpg)|*.jpg|GIF文件(*.gif)|*.gif";
            dlg.FilterIndex = 1;
            if (dlg.ShowDialog() == DialogResult.OK)
            {
                pictureBox1.Image.Save(dlg.FileName);
            }
        }        private void 退出ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            this.Close();
        }        private void 左上角ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            Image image = pictureBox1.Image;
            Bitmap bmp = new Bitmap(pictureBox1.Width, pictureBox1.Height);
           using (Graphics g = Graphics.FromImage(bmp))
            {
               using (Graphics gp = pictureBox1.CreateGraphics())
                {
                    int i = -Math.Max(pictureBox1.Width, pictureBox1.Height);
                    while (i < pictureBox1.Width || i < pictureBox1.Height)
                    {
                        g.Clear(this.BackColor);
                        g.DrawImage(image, i, i);
                        gp.DrawImage(bmp, 0, 0);
                        i++;
                    }
                }
            }
            pictureBox1.Refresh();
                  
        }        private void 上到下ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            int y;
            Graphics g = pictureBox1.CreateGraphics();
            g.Clear(this.BackColor);
            box = new Bitmap(pictureBox1.Image);
            width = pictureBox1.Image.Width;
            height = pictureBox1.Image.Height;
            for (y = 0; y < height; y++)
            {
                g.DrawImage(box, 0, 0, width, y);
            }
        }        private void 左到右ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            int x;
            Graphics g = pictureBox1.CreateGraphics();
            g.Clear(this.BackColor);
            box = new Bitmap(pictureBox1.Image);
            width = this.pictureBox1.Image.Width;
            height = pictureBox1.Image.Height;
            for (x = 0; x < width; x++)
            {
                g.DrawImage(box, 0, 0, x, height);
            }
        }        private void 右上角ToolStripMenuItem_Click(object sender, EventArgs e)
        { // 从右上角飞到左下角  -----修改后     
            width = pictureBox1.Image.Width;
            height = pictureBox1.Image.Height;
            
            Graphics g2 = pictureBox2.CreateGraphics();
            Image image1 = pictureBox1.Image;            int width2=this.pictureBox2.Width ;
            int height2=this.pictureBox2.Height ;
            for (int x = width2 - image1.Width, y = 0; x >= -image1.Width && y <= height2; x--, y++)
            {
                g2.Clear(this.BackColor);
                g2.DrawImage(image1, x,y);
                System.Threading.Thread.Sleep(20);
            }
            //int x, y;
            //Graphics g = pictureBox2.CreateGraphics();
            //g.Clear(this.BackColor);
            //box = new Bitmap(pictureBox1.Image);
            //width = pictureBox1.Image.Width;
            //height = pictureBox1.Image.Height;
            //for (x = 0; x < width; x++)
            //{
            //    y = height * x / width;
            //    Rectangle DestRect = new Rectangle(width - x, 0, x, y); 
            //    Rectangle SrcRect = new Rectangle(0, height - y, width, height);  
            //    g.DrawImage(box, DestRect, SrcRect, GraphicsUnit.Pixel);
            //    System.Threading.Thread.Sleep(10);
            //}
        }        private void 左下角ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            int x, y;
            Graphics g = pictureBox2.CreateGraphics();
            g.Clear(this.BackColor);
            box = new Bitmap(pictureBox1.Image);
            width = pictureBox1.Image.Width;
            height = pictureBox1.Image.Height;
            for (y = 0; y < height; y++)
            {
                x = width * y / height;
                Rectangle DestRect = new Rectangle(0, height - y, x, y); 
                Rectangle SrcRect = new Rectangle(0, 0, width, height); 
                g.DrawImage(box, DestRect, SrcRect, GraphicsUnit.Pixel);
                System.Threading.Thread.Sleep(10);
            }
        }        private void 右下角ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            box = new Bitmap(pictureBox1.Image);
            Graphics g = pictureBox2.CreateGraphics();
            g.Clear(this.BackColor);
            width = pictureBox1.Image.Width;
            height = pictureBox1.Image.Height;
            int x, y;
            for (x = 0; x < width; x++)
            {
                y = height * x / width;
                Rectangle DestRect = new Rectangle(width - x, height - y, x, y);
                Rectangle SrcRect = new Rectangle(0, 0, width, height);
                g.DrawImage(box, DestRect, SrcRect, GraphicsUnit.Pixel);
                System.Threading.Thread.Sleep(10);
            }         }        private void 四周向中心ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            box = new Bitmap(pictureBox1.Image);
            width = this.pictureBox1.Image.Width; 
            height = this.pictureBox1.Image.Height; 
            Graphics g = this.pictureBox2.CreateGraphics();
            g.Clear(this.BackColor);
            Bitmap bmp = new Bitmap(width, height);
            int x;
            for (x = 0; x < width; x++)
            {
                for (int i = 0; i < height / 2; i++)
                {
                    bmp.SetPixel(x, i, box.GetPixel(x, i));
                    bmp.SetPixel(width - x - 1, i, box.GetPixel(width - x - 1, i));
                }
                for (int i = 0; i < height / 2; i++)
                {
                    bmp.SetPixel(x, height - 1 - i, box.GetPixel(x, height - 1 - i));
                    bmp.SetPixel(width - x - 1, height - i, box.GetPixel(width - x - 1, height- i-1));
                }
                
                g.DrawImage(bmp, 0, 0);
                
            }
        }        private void 中心向四周ToolStripMenuItem_Click(object sender, EventArgs e)
        {
            box = new Bitmap(pictureBox1.Image);
            Graphics g = pictureBox2.CreateGraphics();
            g.Clear(this.BackColor);
            width = pictureBox1.Image.Width;
            height = pictureBox1.Image.Height;
            for (int x = 0; x <= width / 2; x++)
            {
                int y = height * x / width;
                Rectangle DestRect = new Rectangle(width / 2 - x, height / 2 - y, 2 * x, 2 * y);
                Rectangle SrcRect = new Rectangle(0, 0, width, height);
                g.DrawImage(box, DestRect, SrcRect, GraphicsUnit.Pixel);
                System.Threading.Thread.Sleep(10);
            }
        }
    }
}