关于WPF WriteableBitmap类直接操作像素点的问题
作者：wu.g.q
WPF是微软新一代图形系统，运行在.NET Framework 3.0及以上版本下，为用户界面、2D/3D 图形、文档和媒体提供了统一的描述和操作方法，本文重点给大家介绍WPF WriteableBitmap类直接操作像素点的问题，感兴趣的朋友一起看看吧
WPF（Windows Presentation Foundation）是微软推出的基于Windows 的用户界面框架，属于.NET Framework 3.0的一部分。它提供了统一的编程模型、语言和框架，真正做到了分离界面设计人员与开发人员的工作；同时它提供了全新的多媒体交互用户图形界面。
还是话不多说，直接上码：
1.新建WpfApp应用程序
2.MainWindow.xaml文件代码如下：
<Window x:Class="WpfApp1.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfApp1"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="*"></RowDefinition>
<RowDefinition Height="10*" ></RowDefinition>
</Grid.RowDefinitions>
<Button Name="button" Grid.Row="0" HorizontalAlignment="Center" Content="generate_bitmap" MinWidth="120" MinHeight="30" Click="Button_Click"></Button>
<Grid x:Name="imgGrid" Grid.Row="1">
<Viewbox>
<Image x:Name="img" Width="{Binding RelativeSource={RelativeSource Self}, Path=Source.PixelWidth}"
Height="{Binding RelativeSource={RelativeSource Self}, Path=Source.PixelHeight}"
Source="{Binding CtrlImage, IsAsync=True}"
Stretch="None" />
</Viewbox>
</Grid>
</Grid>
</Window>3.MainWindow.xaml.cs文件代码如下：
using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using System.Drawing;
using System.Drawing.Drawing2D;
namespace WpfApp1
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
public void Button_Click(object sender, RoutedEventArgs e)
WriteableBitmap wb = new WriteableBitmap((int)imgGrid.ActualWidth, (int)imgGrid.ActualHeight, 96, 96, PixelFormats.Pbgra32, null);
wb.Lock();
Bitmap backBitmap = new Bitmap((int)imgGrid.ActualWidth, (int)imgGrid.ActualHeight, wb.BackBufferStride, System.Drawing.Imaging.PixelFormat.Format32bppArgb, wb.BackBuffer);
Int32Rect rect = new Int32Rect(0, 0, (int)imgGrid.ActualWidth, (int)imgGrid.ActualHeight);
byte[] pixels = new byte[(int)imgGrid.ActualWidth * (int)imgGrid.ActualHeight * wb.Format.BitsPerPixel / 8];
Random rand = new Random();
for (int y = 0; y < wb.PixelHeight; y++)
{
for (int x = 0; x < wb.PixelWidth; x++)
{
int alpha = 0;
int red = 0;
int green = 0;
int blue = 0;
if ((x % 5 == 0) || (y % 7 == 0))
{
red = (int)((double)y / wb.PixelHeight * 255);
green = rand.Next(100, 255);
blue = (int)((double)x / wb.PixelWidth * 255);
alpha = 255;
}
else
red = (int)((double)x / wb.PixelWidth * 255);
blue = (int)((double)y / wb.PixelHeight * 255);
alpha = 50;
int pixeloffset = (x + y * wb.PixelWidth) * wb.Format.BitsPerPixel / 8;
pixels[pixeloffset] = (byte)blue;
pixels[pixeloffset + 1] = (byte)green;
pixels[pixeloffset + 2] = (byte)red;
pixels[pixeloffset + 3] = (byte)alpha;
}
int stride = (wb.PixelWidth * wb.Format.BitsPerPixel) / 8;
wb.WritePixels(rect, pixels, stride, 0);
}
wb.Unlock();
backBitmap.Dispose();
backBitmap = null;
img.Source = wb;
}
}效果如下：
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