如何旋转任何程度的图像？
我有动画gif和我使用类来解析它的图像(帧).这堂课是:
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; } }
}
现在在form1中,我在这种情况下循环遍历帧4,我希望以任何角度旋转动画.现在它每转45或90度.我想为动画添加更多帧(图像),所以如果我将旋转设置为31或10度,那么我将看到动画旋转10度.
这是Form1中的代码,它不能正常工作.我使用旋转功能,我没有测试,如果它的任何工作.
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;
}
}
}
可以在这里找到用于测试的动画gif:
Oma*_*mar 21
我不明白你的问题是什么,但我认为你的代码可以改进.我认为你不需要直接使用这个Matrix类.有一些功能可以帮助您.事实上,您唯一需要的是:将旋转点设置为中心,旋转图形并在其上绘制,使用Graphics类的某些功能.因此,要旋转图像,您可以使用以下简单代码:
private Bitmap RotateImage(Bitmap bmp, float angle) {
Bitmap rotatedImage = new Bitmap(bmp.Width, bmp.Height);
using (Graphics g = Graphics.FromImage(rotatedImage)) {
// Set the rotation point to the center in the matrix
g.TranslateTransform(bmp.Width / 2, bmp.Height / 2);
// Rotate
g.RotateTransform(angle);
// Restore rotation point in the matrix
g.TranslateTransform(- bmp.Width / 2, - bmp.Height / 2);
// Draw the image on the bitmap
g.DrawImage(bmp, new Point(0, 0));
}
return rotatedImage;
}
小智 7
我自己尝试了@Omar 的答案并意识到，原始图像在两侧被剪掉了......我已经重写了它，因此它将图像调整为新尺寸：
private static Bitmap RotateImage(Bitmap bmp, float angle)
{
float alpha = angle;
//edit: negative angle +360
while(alpha <0) alpha +=360;
float gamma = 90;
float beta = 180 - angle - gamma;
float c1 = bmp.Height;
float a1 = (float)(c1 * Math.Sin(alpha * Math.PI / 180) / Math.Sin(gamma * Math.PI / 180));
float b1 = (float)(c1 * Math.Sin(beta * Math.PI / 180) / Math.Sin(gamma * Math.PI / 180));
float c2 = bmp.Width;
float a2 = (float)(c2 * Math.Sin(alpha * Math.PI / 180) / Math.Sin(gamma * Math.PI / 180));
float b2 = (float)(c2 * Math.Sin(beta * Math.PI / 180) / Math.Sin(gamma * Math.PI / 180));
int width = Convert.ToInt32(b2 + a1);
int height = Convert.ToInt32(b1 + a2);
Bitmap rotatedImage = new Bitmap(width, height);
using (Graphics g = Graphics.FromImage(rotatedImage))
{
g.TranslateTransform(rotatedImage.Width / 2, rotatedImage.Height / 2); //set the rotation point as the center into the matrix
g.RotateTransform(angle); //rotate
g.TranslateTransform(-rotatedImage.Width / 2, -rotatedImage.Height / 2); //restore rotation point into the matrix
g.DrawImage(bmp, new Point((width - bmp.Width) / 2, (height - bmp.Height) / 2)); //draw the image on the new bitmap
}
return rotatedImage;
}
小智 6
根据先前的答案，我创建了此代码，该代码不会剪切图像（其他示例对我不起作用）
private Bitmap RotateImage(Bitmap bmp, float angle)
{
float height = bmp.Height;
float width = bmp.Width;
int hypotenuse = System.Convert.ToInt32(System.Math.Floor(Math.Sqrt(height * height + width * width)));
Bitmap rotatedImage = new Bitmap(hypotenuse, hypotenuse);
using (Graphics g = Graphics.FromImage(rotatedImage))
{
g.TranslateTransform((float)rotatedImage.Width / 2, (float)rotatedImage.Height / 2); //set the rotation point as the center into the matrix
g.RotateTransform(angle); //rotate
g.TranslateTransform(-(float)rotatedImage.Width / 2, -(float)rotatedImage.Height / 2); //restore rotation point into the matrix
g.DrawImage(bmp, (hypotenuse - width) / 2, (hypotenuse - height) / 2, width, height);
}
return rotatedImage;
}
您是否尝试过RotateFlip？
public partial class Form1 : Form
{
Image myImage;
AnimatedGif myGif;
Bitmap bitmap;
public Form1()
{
InitializeComponent();
myImage = Image.FromFile(@"D:\fananimation.gif");
bitmap = new Bitmap(myImage);
bitmap.RotateFlip(System.Drawing.RotateFlipType.Rotate90FlipNone);
this.pictureBox1.Image = bitmap;
}
}
- RotateFlip() 方法工作正常，但只有少数默认翻转类型，如果您想模拟具有流体运动的 gif，则此方法无法工作。 (2认同)