C# 将渲染器转换为位图
我需要通过C# 将渲染器转换为位图,c#,gdi+,C#,Gdi+,我需要通过VisualStyleRenderer绘制一个不同的进度条。如果我使用OnPaint方法的Graphics,一切正常。但由于我想将其保存在硬盘中,我需要在位图对象中渲染progressbar,然后保存它 下面是示例代码 protected override void OnPaint(PaintEventArgs e) { base.OnPaint(e); e.Graphics.DrawImage(RenderProgressbarImage(), new Point(5
VisualStyleRenderer
绘制一个不同的进度条。如果我使用OnPaint
方法的Graphics
,一切正常。但由于我想将其保存在硬盘中,我需要在位图
对象中渲染progressbar,然后保存它
下面是示例代码
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
e.Graphics.DrawImage(RenderProgressbarImage(), new Point(5, 5));
//following code works good
progressRenderer.SetParameters("PROGRESS", 11, 2);
progressRenderer.DrawBackground(e.Graphics, new Rectangle(125, 5, 100, 13));
}
VisualStyleRenderer progressRenderer = new VisualStyleRenderer(VisualStyleElement.ProgressBar.Bar.Normal);
Bitmap RenderProgressbarImage()
{
Bitmap bmp = new Bitmap(100, 13);
using (Graphics g = Graphics.FromImage((Image)bmp))
{
progressRenderer.SetParameters("PROGRESS", 11, 2);
progressRenderer.DrawBackground(g, new Rectangle(0, 0, bmp.Width, bmp.Height));
}
return bmp;
}
但如果我在位图中绘制它,它有黑色的角而不是透明的。但是,如果它使用OnPaint
的图形
,一切都会很好
使用
位图
,您将使用GDI+创建一个矩形对象
可能会帮助您创建所需的圆形位图图像
编辑-修改了RenderProgressbarImage
以将图形
对象作为输入
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
e.Graphics.DrawImage(RenderProgressbarImage(e.Graphics), new Point(5, 5));
//Test to Check for Output
RenderProgressbarImage(e.Graphics).Save(@"C:\Bitmap.bmp");;
//following code works good
progressRenderer.SetParameters("PROGRESS", 11, 2);
progressRenderer.DrawBackground(e.Graphics, new Rectangle(125, 5, 100, 13));
}
Bitmap RenderProgressbarImage(Graphics g)
{
Bitmap bmp = new Bitmap(100, 13, g);
progressRenderer.SetParameters("PROGRESS", 11, 2);
progressRenderer.DrawBackground(g, new Rectangle(0, 0, bmp.Width, bmp.Height));
return bmp;
}
Edit2:根据OP下面的评论修改以简化解决方案
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
Bitmap bmp = new Bitmap(100, 13, e.Graphics);
bmp.Save(<SomefilePath.png>);
//following code works good
progressRenderer.SetParameters("PROGRESS", 11, 2);
progressRenderer.DrawBackground(e.Graphics, new Rectangle(125, 5, 100, 13));
}
protected override void OnPaint(PaintEventArgs e)
{
基础漆(e);
位图bmp=新位图(100、13、e.Graphics);
bmp.Save();
//下面的代码运行良好
progressRenderer.SetParameters(“PROGRESS”,11,2);
牵引地面(例如图形,新矩形(125,5100,13));
}
注意:在
OnPaint
事件中保存Bitmap
会对渲染造成一定的性能影响。也许只需更新类中的位图
变量,并定期从不同的线程
/some计时器
/etc保存位图
。;这完全取决于你的需要。我知道它很旧,但我也面临着同样的问题,经过大量研究,我找到了一个解决方案,我希望它能帮助别人
// Created by: Motaz Alnuweiri
// Reference:
// URL1: https://www.autoitscript.com/forum/topic/181956-drawthemebackground-bitmap-alpha/
// URL2: https://gist.github.com/wavescholar/11297223#file-gdi-bitmap-conversion-L71
// URL3: https://www.experts-exchange.com/questions/20872978/BITMAPINFOHEADER-from-NET-Bitmap.html
using System;
using System.Drawing;
using System.Drawing.Imaging;
using System.Runtime.InteropServices;
using System.Windows.Forms;
using System.Windows.Forms.VisualStyles;
public class Helper
{
#region Win32 Native APIs
internal class NativeMethods
{
// CreateDIBSection funcation iUsage value
internal const int DIB_RGB_COLORS = 0x00;
internal const int DIB_PAL_COLORS = 0x01;
internal const int DIB_PAL_INDICES = 0x02;
[DllImport("gdi32.dll", CharSet = CharSet.Unicode)]
internal static extern bool DeleteObject(IntPtr hObject);
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
internal static extern int InvalidateRect(IntPtr hwnd, IntPtr rect, int bErase);
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
internal static extern IntPtr GetDC(IntPtr hwnd);
[DllImport("gdi32.dll", CharSet = CharSet.Unicode)]
internal static extern IntPtr CreateCompatibleDC(IntPtr hdc);
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
internal static extern int ReleaseDC(IntPtr hwnd, IntPtr hdc);
[DllImport("gdi32.dll", CharSet = CharSet.Unicode)]
internal static extern int DeleteDC(IntPtr hdc);
[DllImport("gdi32.dll", CharSet = CharSet.Unicode)]
internal static extern IntPtr SelectObject(IntPtr hdc, IntPtr hgdiobj);
[DllImport("gdi32.dll", CharSet = CharSet.Unicode)]
internal static extern IntPtr CreateDIBSection(IntPtr hdc, ref BITMAPINFO bmi, uint iUsage,
out IntPtr bits, IntPtr hSection, uint dwOffset);
[DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
internal static extern void CopyMemory(IntPtr dest, IntPtr src, uint count);
[StructLayout(LayoutKind.Sequential)]
internal struct BITMAPINFO
{
public Int32 biSize;
public Int32 biWidth;
public Int32 biHeight;
public Int16 biPlanes;
public Int16 biBitCount;
public Int32 biCompression;
public Int32 biSizeImage;
public Int32 biXPelsPerMeter;
public Int32 biYPelsPerMeter;
public Int32 biClrUsed;
public Int32 biClrImportant;
}
}
#endregion
public static Image VisualStyleRendererToImage(VisualStyleElement element, Rectangle bounds)
{
if (ToolStripManager.VisualStylesEnabled && VisualStyleRenderer.IsElementDefined(element))
{
VisualStyleRenderer renderer = new VisualStyleRenderer(element);
using (Bitmap bit = new Bitmap(bounds.Width, bounds.Height, PixelFormat.Format32bppArgb))
{
NativeMethods.BITMAPINFO bmi = new NativeMethods.BITMAPINFO();
bmi.biWidth = bit.Width;
bmi.biHeight = bit.Height;
bmi.biPlanes = 1;
bmi.biBitCount = 32;
bmi.biXPelsPerMeter = (int)bit.HorizontalResolution;
bmi.biYPelsPerMeter = (int)bit.VerticalResolution;
bmi.biSize = Marshal.SizeOf(typeof(NativeMethods.BITMAPINFO));
IntPtr bits;
IntPtr bmp = NativeMethods.CreateDIBSection(IntPtr.Zero, ref bmi,
NativeMethods.DIB_RGB_COLORS, out bits, IntPtr.Zero, 0);
IntPtr dc = NativeMethods.GetDC(IntPtr.Zero);
IntPtr hdc = NativeMethods.CreateCompatibleDC(dc);
NativeMethods.SelectObject(hdc, bmp);
using (Graphics g = Graphics.FromHdc(hdc))
{
renderer.DrawBackground(g, bounds);
}
Bitmap image = new Bitmap(bounds.Width, bounds.Height, PixelFormat.Format32bppPArgb);
using (Bitmap tempImage = new Bitmap(bounds.Width, bounds.Height, bounds.Width * 4,
PixelFormat.Format32bppPArgb, bits))
{
BitmapData tempBitmapData = tempImage.LockBits(bounds, ImageLockMode.ReadOnly,
PixelFormat.Format32bppPArgb);
BitmapData bitmapData = image.LockBits(bounds, ImageLockMode.WriteOnly,
PixelFormat.Format32bppPArgb);
NativeMethods.CopyMemory(bitmapData.Scan0, tempBitmapData.Scan0,
(uint)tempBitmapData.Stride * (uint)tempBitmapData.Height);
tempImage.UnlockBits(tempBitmapData);
image.UnlockBits(bitmapData);
}
NativeMethods.DeleteObject(bmp);
NativeMethods.DeleteDC(hdc);
NativeMethods.ReleaseDC(IntPtr.Zero, dc);
return image;
}
}
else
{
return new Bitmap(bounds.Width, bounds.Height);
}
}
}
参考:URL1:
URL2:
URL3:
创建圆角图像是另一回事。那不是我想要的。我需要使用VisualStyleRenderer绘制更多内容。让我看看是否可以为您提供一个工作示例。更重要的是,我将向您介绍在这种情况下用于处理拐角的
图形例程e.Graphics
已经在OnPaint
事件中工作了对不起,我不明白你想说什么。图形对象是非圆角的原因;使用该问题中的圆角Graphics
例程是一个选项,但从OnPaint
传递Graphics
是最简单的解决方案是的,但我不需要在控件上绘制,我需要它保存为png。只有使用“OnPaint”绘制它,然后调用该控件的“DrawToBitmap”,这才有可能,但这不是一个好主意,非常糟糕。