我怎么可以由任何程度的旋转图像？ [英] How can i rotate an image by any degree?

问题描述

我一直在使用一个类从它解析图像（帧）gif动画和IM。
类是：

I have animated gif and im using a class to parse the images(frames) from it. The class is:

using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Collections.Generic;
using System.IO;

public class AnimatedGif
{
    private List<AnimatedGifFrame> mImages = new List<AnimatedGifFrame>();
    public AnimatedGif(string path)
    {
        Image img = Image.FromFile(path);
        int frames = img.GetFrameCount(FrameDimension.Time);
        if (frames <= 1) throw new ArgumentException("Image not animated");
        byte[] times = img.GetPropertyItem(0x5100).Value;
        int frame = 0;
        for (; ; )
        {
            int dur = BitConverter.ToInt32(times, 4 * frame);
            mImages.Add(new AnimatedGifFrame(new Bitmap(img), dur));
            if (++frame >= frames) break;
            img.SelectActiveFrame(FrameDimension.Time, frame);
        }
        img.Dispose();
    }
    public List<AnimatedGifFrame> Images { get { return mImages; } }
}

public class AnimatedGifFrame
{
    private int mDuration;
    private Image mImage;
    internal AnimatedGifFrame(Image img, int duration)
    {
        mImage = img; mDuration = duration;
    }
    public Image Image { get { return mImage; } }
    public int Duration { get { return mDuration; } }
}

在Form1我遍历所有的帧现在，在这种情况下，4和我希望通过任何程度旋转动画。现在，它的每一个旋转45度或90度。我想更多的帧（图像）添加到动画，所以如果我设置旋转到31或10度，所以我会看到动画中的10度旋转。

Now in form1 i loop over the frames in this case 4 and i want to rotate the animation by any degree. Now its rotating each 45 or 90 degrees. I want to add more frames(images) to the animation so if i set the rotation to 31 or to 10 degrees so i will see the animation rotating in 10 degrees.

这是在Form1中至极代码不工作好。 。使用功能旋转至极IM我没有测试但如果它的任何工作。

This is the code in Form1 wich is not working good. Im using a function for the rotation wich i didnt test yet if its any working.

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 AnimatedGifEditor
{
    public partial class Form1 : Form
    {
        Image myImage;
        AnimatedGif myGif;
        Bitmap bitmap;

        public Form1()
        {
            InitializeComponent();

            myImage = Image.FromFile(@"D:\fananimation.gif");
            myGif = new AnimatedGif(@"D:\fananimation.gif");
            for (int i = 0; i < myGif.Images.Count; i++)
            {
                pictureBox1.Image = myGif.Images[3].Image;
                bitmap = new Bitmap(pictureBox1.Image);
                rotateImage(bitmap, 76);
                pictureBox1.Image = bitmap;
            }


        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }



private Bitmap RotateImg(Bitmap bmp, float angle, Color bkColor)
    {
        int w = bmp.Width;
        int h = bmp.Height;
        bmp.PixelFormat pf = default(bmp.PixelFormat);
        if (bkColor == Color.Transparent)
        {
            pf = bmp.Format32bppArgb;
        }
        else
        {
            pf = bmp.PixelFormat;
        }

        Bitmap tempImg = new Bitmap(w, h, pf);
        Graphics g = Graphics.FromImage(tempImg);
        g.Clear(bkColor);
        g.DrawImageUnscaled(bmp, 1, 1);
        g.Dispose();

        GraphicsPath path = new GraphicsPath();
        path.AddRectangle(new RectangleF(0f, 0f, w, h));
        Matrix mtrx = new Matrix();
        //Using System.Drawing.Drawing2D.Matrix class 
        mtrx.Rotate(angle);
        RectangleF rct = path.GetBounds(mtrx);
        Bitmap newImg = new Bitmap(Convert.ToInt32(rct.Width), Convert.ToInt32(rct.Height), pf);
        g = Graphics.FromImage(newImg);
        g.Clear(bkColor);
        g.TranslateTransform(-rct.X, -rct.Y);
        g.RotateTransform(angle);
        g.InterpolationMode = InterpolationMode.HighQualityBilinear;
        g.DrawImageUnscaled(tempImg, 0, 0);
        g.Dispose();
        tempImg.Dispose();
        return newImg;
    }
    }
}

使用GIF动画IM测试可以在这里找到：

The animated gif im using for the test can be found here:

推荐答案

我不明白什么是你的问题，但我认为你的代码可以改进。我认为你不需要直接使用矩阵类。有一些，这是否对你的工作职能。 INFACT你需要的是唯一的东西：设置旋转为中心的角度，旋转图形，借鉴它，使用某些功能由图形类。
所以旋转，你可以使用这个简单的代码的图像：

I didn't understand what's your problem but I think that your code could be improved. I think that you don't need to use directly the Matrix class. There are some functions that does this work for you. Infact the only things you need are: set the point of the rotation as the center, rotate the graphics and draw on it, using some functions by the Graphics class. So to rotate an image you can use this simple code:

private Bitmap RotateImage( Bitmap bmp, float angle ) {
     Bitmap rotatedImage = new Bitmap( bmp.Width, bmp.Height );
     using ( Graphics g = Graphics.FromImage( rotatedImage ) ) {
        g.TranslateTransform( bmp.Width / 2, bmp.Height / 2 ); //set the rotation point as the center into the matrix
        g.RotateTransform( angle ); //rotate
        g.TranslateTransform( -bmp.Width / 2, -bmp.Height / 2 ); //restore rotation point into the matrix
        g.DrawImage( bmp, new Point( 0, 0 ) ); //draw the image on the new bitmap
     }

     return rotatedImage;
}

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