截图--控件截图
//control.CopyFromScreen
//ok
//Rectangle rectangleBounds = pbx.Bounds;
//Bitmap bit = new Bitmap(rectangleBounds.Width, rectangleBounds.Height);//实例化一个和窗体一样大的bitmap
//Graphics g = Graphics.FromImage(bit);
//g.CompositingQuality = CompositingQuality.HighQuality;//质量设为最高
g.CopyFromScreen(pbx.Left, pbx.Top, 0, 0, new Size(pbx.Width, pbx.Height));//保存整个窗体为图片
//g.CopyFromScreen(pbx.PointToScreen(Point.Empty), Point.Empty, pbx.Size);//保存整个窗体为图片
g.CopyFromScreen(panel游戏区 .PointToScreen(Point.Empty), Point.Empty, panel游戏区.Size);//只保存某个控件（这里是panel游戏区）
//bit.Save("签名.png");//默认保存格式为PNG，保存成jpg格式质量不是很好
//保存dataGridView1截图
//Bitmap newbitmap = new Bitmap(pbx.Width, pbx.Height);
//pbx.DrawToBitmap(newbitmap, new Rectangle(0, 0, newbitmap.Width, newbitmap.Height));
//newbitmap.Save("签名pbx.DrawToBitmap.png"); 读取指纹文件图片，加载在picturebox中
/// <summary>
/// 创建画布的画板背景
/// </summary>
Bitmap backgroundImage = null;
//this.pbx.BackgroundImage = System.Drawing.Image.FromFile(tempPath);
using (FileStream ms = File.OpenRead(tempPath))
{
//File.WriteAllBytes("Fingerprint222.bmp", File.ReadAllBytes("11.png"));
//File.WriteAllBytes("Fingerprint.bmp", imageBufFingerprint);
//解决内存异常问题，以及this.pbx.BackgroundImage = System.Drawing.Image.FromStream(ms)导致的一般性gdi+ 问题
using (Bitmap bt = new Bitmap(ms))
{
backgroundImage = new Bitmap(bt.Width, bt.Height);
//Graphics g = pbx.CreateGraphics();
Graphics g = Graphics.FromImage(backgroundImage);
//g.DrawLine(Pens.Black, startPoint, e.Location);
//g.Clear(Color.White);
//Pen myPen = new Pen(Color.Black, int.TryParse(ConfigurationManager.AppSettings["penwidth"], out int penwidth) ? penwidth : 3);
g.SmoothingMode = SmoothingMode.AntiAlias;
g.CompositingQuality = CompositingQuality.HighQuality;
g.CompositingMode = CompositingMode.SourceOver;
g.DrawImage(bt, bt.Width, bt.Height);
//PointF pointFstart = PointToPointF(startPoint);
//PointF pointFend = PointToPointF(e.Location);
//g.DrawBeziers(myPen, new PointF[] { pointFstart, pointFend });
pbx.BackgroundImage = backgroundImage;
g.Dispose();
//bt.Save("Fingerprint.jpg");
//this.pbx.BackgroundImage = System.Drawing.Image.FromStream(ms);
}
}
//解决提示内存异常错误
GC.Collect();bmp转png 设置透明度
var imagezzRaw2Bmp=System.IO.File.ReadAllBytes("Fingerprint.bmp");
using (Bitmap bitmap = new Bitmap(new MemoryStream(imagezzRaw2Bmp)))
//using (Bitmap bitmap = new Bitmap("Fingerprint.bmp"))
{
//bitmap.MakeTransparent(Color.FromArgb(0, Color.Transparent));
bitmap.MakeTransparent(Color.FromArgb(0, Color.White));//设置指定颜色为透明。白色
bitmap.Save("Fingerprint.png");
//var bitmap1 = Untils.GeneralConvert(bitmap, Color.Blue);
//bitmap1.Save(@"01.png");
}bmp图片缩放问题
/// <summary>
/// 缩小比例
/// </summary>
/// <param name="originalSize"></param>
/// <param name="targetSize"></param>
/// <returns></returns>
public static Size CalculateNewSize(Size originalSize, Size targetSize)
{
int newWidth, newHeight;
// 如果原始宽度大于目标宽度，则按宽度比例缩放
if (originalSize.Width > targetSize.Width)
{
newWidth = targetSize.Width;
newHeight = (int)(((float)originalSize.Height) * (float)((float)targetSize.Width / (float)originalSize.Width));
}
// 如果原始高度大于目标高度，则按高度比例缩放
else if (originalSize.Height > targetSize.Height)
{
newHeight = targetSize.Height;
newWidth = originalSize.Width * targetSize.Height / originalSize.Height;
}
// 如果原始尺寸小于或等于目标尺寸，则不需要缩放
else
{
newWidth = originalSize.Width;
newHeight = originalSize.Height;
}
return new Size(newWidth, newHeight);
}
/// <summary>
/// 放大缩小
/// </summary>
/// <param name="originalSize"></param>
/// <param name="targetSize"></param>
/// <param name="isScale"></param>
/// <returns></returns>
public static Size CalculateSize(Size originalSize, Size targetSize, bool isScale = true)
{
int newWidth, newHeight;
if (isScale)
{
// 如果原始宽度大于目标宽度，则按宽度比例缩放
if (originalSize.Width > targetSize.Width)
{
newWidth = targetSize.Width;
newHeight = originalSize.Height * targetSize.Width / originalSize.Width;
}
// 如果原始高度大于目标高度，则按高度比例缩放
else if (originalSize.Height > targetSize.Height)
{
newHeight = targetSize.Height;
newWidth = originalSize.Width * targetSize.Height / originalSize.Height;
}
// 如果原始尺寸小于或等于目标尺寸，则不需要缩放
else
{
newWidth = originalSize.Width;
newHeight = originalSize.Height;
}
}
else
{
// 如果原始宽度大于目标宽度，则按宽度比例放大
if (originalSize.Width < targetSize.Width)
{
newWidth = targetSize.Width;
newHeight = targetSize.Height * targetSize.Width / originalSize.Width;
}
// 如果原始高度大于目标高度，则按高度比例缩放
else if (originalSize.Height < targetSize.Height)
{
newHeight = targetSize.Height;
newWidth = originalSize.Width * targetSize.Height / originalSize.Height;
}
// 如果原始尺寸小于或等于目标尺寸，则不需要缩放
else
{
newWidth = originalSize.Width;
newHeight = originalSize.Height;
}
}
return new Size(newWidth, newHeight);
}
调用
//缩小保存
int signWidth = int.TryParse(ConfigurationManager.AppSettings["fingerprintWidth"], out int signwidth) ? signwidth : 25;
int signHeight = int.TryParse(ConfigurationManager.AppSettings["fingerprintHeight"], out int signheight) ? signheight : 36;
// 计算等比缩放后的尺寸
Size newSize = Untils.CalculateNewSize(pbxFingerprint.Image.Size, new Size(signWidth, signHeight));
using (Bitmap resizedImage = new Bitmap(pbxFingerprint.Image, newSize))
{
// 获取PNG图像编码器
ImageCodecInfo imageCodecInfo = Untils.GetEncoderInfo("image/png"); //ImageCodecInfo.GetImageEncoders().Where(a=>a.MimeType== "image/png").First();
// 设置PNG图像编码参数
EncoderParameters encoderParameters = new EncoderParameters(1);
EncoderParameter encoderParameter = new EncoderParameter(System.Drawing.Imaging.Encoder.Quality, 100L); // 设置质量为100%
encoderParameters.Param[0] = encoderParameter;
// 保存Bitmap为PNG格式
//bitmap.MakeTransparent(Color.FromArgb(0, Color.Transparent));
resizedImage.MakeTransparent(Color.FromArgb(0, Color.White));//设置指定颜色为透明。白色
resizedImage.Save(tempLocalFingerPrintPath, imageCodecInfo, encoderParameters);
}
