wpf图片转object,wpf图片旋转
wpf怎么把文本转成图片
RenderTargetBitmap： 这个类可以将任何容器控件渲染成一个位图
示例： ListView livStudent
var?render?=?new?RenderTargetBitmap((int)livStudent.ActualWidth,?(int)livStudent.ActualHeight,?96,?96,?PixelFormats.Pbgra32);
render.Render(livStudent);
BitmapEncoder?encoder?=?new?PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(render));
using?(var?stream?=?File.Create(@"d:\123.jpg"))
????encoder.Save(stream);
WPF中 通过socket 接收到的 JPG 二进制流如何转成 Image.Source
，原来的程序是用winform写的 同样的socket函数 获取到同样的二进制流，winform中直接使用 System.Drawing.Image img = System.Drawing.Image.FromStream(info.MemoryStream);然后将img对象给到 pictureBox1.Image = img;在wpf中 图片控件有所改变 使用的是 Image 对象 对应的图片属性是 Source 类型是 System.Windows.Media.ImageSource 找了一些转换方法 其中一个方法是： BitmapImage image = new BitmapImage();
image.BeginInit();
image.StreamSource = info.MemoryStream;
image.EndInit(); 转换无效 异常是：无法对此图像进行解码。该图像头可能已损坏。我分析了一下 过来的二进制流式jpeg格式的，而 BitmapImage 字面意思应该是位图图像，所以转换失败。。后来在 System.Windows.Media.Imaging 下找到了 一个 JpegBitmapDecoder 使用方法： BitmapDecoder decoder = JpegBitmapDecoder.Create(info.MemoryStream, BitmapCreateOptions.PreservePixelFormat, BitmapCacheOption.Default);
image1.Source = decoder.Frames[0]; 同样无效。。图片还没没有出来但是二进制流肯定是对了 我使用了 System.Drawing.Image img = System.Drawing.Image.FromStream(info.MemoryStream);
img.Save("i:\\pic\\" + DateTime.Now.Ticks + "_.jpg");保存到磁盘 图片显示正常。高手帮忙啊！！！！先谢过了！
c# wpf背景图片怎么设置成资源文件的图片
代码看起来没问题啊，你设置一下border的Width和Height属性试试有效果吗。
还不行的话把设置ImageSource的代码改成这样看看可以吗
b.ImageSource?=?new?BitmapImage(new?Uri("pack://application:,,,/Resources/px_down.png",?UriKind.RelativeOrAbsolute));
桌面应用 wpf 图片轮播设计中 如图，怎么写这个效果出来呢， 希望会的人给一下开发思路 卡住了 新手一枚
这种情况只能自己绘图，或者使用图片,现在介绍怎么绘图,先展示一下效果图:
第一步:先创建一个绘图类,以支持椭圆形角
?public?class?RoundedCornersPolygon?:?Shape
????{
????????private?readonly?Path?_path;
????????#region?Properties?
????????private?PointCollection?_points;
????????///?summary
????????///?Gets?or?sets?a?collection?that?contains?the?points?of?the?polygon.
????????///?/summary
????????public?PointCollection?Points
????????{
????????????get?{?return?_points;?}
????????????set
????????????{
????????????????_points?=?value;
????????????????RedrawShape();
????????????}
????????}
????????private?bool?_isClosed;
????????///?summary
????????///?Gets?or?sets?a?value?that?specifies?if?the?polygon?will?be?closed?or?not.
????????///?/summary
????????public?bool?IsClosed
????????{
????????????get
????????????{
????????????????return?_isClosed;
????????????}
????????????set
????????????{
????????????????_isClosed?=?value;
????????????????RedrawShape();
????????????}
????????}
????????private?bool?_useRoundnessPercentage;
????????///?summary
????????///?Gets?or?sets?a?value?that?specifies?if?the?ArcRoundness?property?value?will?be?used?as?a?percentage?of?the?connecting?segment?or?not.
????????///?/summary
????????public?bool?UseRoundnessPercentage
????????{
????????????get
????????????{
????????????????return?_useRoundnessPercentage;
????????????}
????????????set
????????????{
????????????????_useRoundnessPercentage?=?value;
????????????????RedrawShape();
????????????}
????????}
????????private?double?_arcRoundness;
????????///?summary
????????///?Gets?or?sets?a?value?that?specifies?the?arc?roundness.
????????///?/summary
????????public?double?ArcRoundness
????????{
????????????get
????????????{
????????????????return?_arcRoundness;
????????????}
????????????set
????????????{
????????????????_arcRoundness?=?value;
????????????????RedrawShape();
????????????}
????????}
????????public?Geometry?Data
????????{
????????????get
????????????{
????????????????return?_path.Data;
????????????}
????????}
????????#endregion
????????public?RoundedCornersPolygon()
????????{
????????????var?geometry?=?new?PathGeometry();
????????????geometry.Figures.Add(new?PathFigure());
????????????_path?=?new?Path?{?Data?=?geometry?};
????????????Points?=?new?PointCollection();
????????????Points.Changed?+=?Points_Changed;
????????}
????????private?void?Points_Changed(object?sender,?EventArgs?e)
????????{
????????????RedrawShape();
????????}
????????#region?Implementation?of?Shape
????????protected?override?Geometry?DefiningGeometry
????????{
????????????get
????????????{
????????????????return?_path.Data;
????????????}
????????}
????????#endregion
????????#region?Private?Methods
????????///?summary
????????///?Redraws?the?entire?shape.
????????///?/summary
????????private?void?RedrawShape()
????????{
????????????var?pathGeometry?=?_path.Data?as?PathGeometry;
????????????if?(pathGeometry?==?null)?return;
????????????var?pathFigure?=?pathGeometry.Figures[0];
????????????pathFigure.Segments.Clear();
????????????for?(int?counter?=?0;?counter??Points.Count;?counter++)
????????????{
????????????????switch?(counter)
????????????????{
????????????????????case?0:
????????????????????????AddPointToPath(Points[counter],?null,?null);
????????????????????????break;
????????????????????case?1:
????????????????????????AddPointToPath(Points[counter],?Points[counter?-?1],?null);
????????????????????????break;
????????????????????default:
????????????????????????AddPointToPath(Points[counter],?Points[counter?-?1],?Points[counter?-?2]);
????????????????????????break;
????????????????}
????????????}
????????????if?(IsClosed)
????????????????CloseFigure(pathFigure);
????????}
????????///?summary
????????///?Adds?a?point?to?the?shape
????????///?/summary
????????///?param?name="currentPoint"The?current?point?added/param
????????///?param?name="prevPoint"Previous?point/param
????????///?param?name="prevPrevPoint"The?point?before?the?previous?point/param
????????private?void?AddPointToPath(Point?currentPoint,?Point??prevPoint,?Point??prevPrevPoint)
????????{
????????????if?(Points.Count?==?0)
????????????????return;
????????????var?pathGeometry?=?_path.Data?as?PathGeometry;
????????????if?(pathGeometry?==?null)?return;
????????????var?pathFigure?=?pathGeometry.Figures[0];
????????????//the?first?point?of?a?polygon
????????????if?(prevPoint?==?null)
????????????{
????????????????pathFigure.StartPoint?=?currentPoint;
????????????}
????????????//second?point?of?the?polygon,?only?a?line?will?be?drawn
????????????else?if?(prevPrevPoint?==?null)
????????????{
????????????????var?lines?=?new?LineSegment?{?Point?=?currentPoint?};
????????????????pathFigure.Segments.Add(lines);
????????????}
????????????//third?point?and?above
????????????else
????????????{
????????????????ConnectLinePoints(pathFigure,?prevPrevPoint.Value,?prevPoint.Value,?currentPoint,?ArcRoundness,?UseRoundnessPercentage);
????????????}
????????}
????????///?summary
????????///?Adds?the?segments?necessary?to?close?the?shape
????????///?/summary
????????///?param?name="pathFigure"/param
????????private?void?CloseFigure(PathFigure?pathFigure)
????????{
????????????//No?need?to?visually?close?the?figure?if?we?don't?have?at?least?3?points.
????????????if?(Points.Count??3)
????????????????return;
????????????Point?backPoint,?nextPoint;
????????????if?(UseRoundnessPercentage)
????????????{
????????????????backPoint?=?GetPointAtDistancePercent(Points[Points.Count?-?1],?Points[0],?ArcRoundness,?false);
????????????????nextPoint?=?GetPointAtDistancePercent(Points[0],?Points[1],?ArcRoundness,?true);
????????????}
????????????else
????????????{
????????????????backPoint?=?GetPointAtDistance(Points[Points.Count?-?1],?Points[0],?ArcRoundness,?false);
????????????????nextPoint?=?GetPointAtDistance(Points[0],?Points[1],?ArcRoundness,?true);
????????????}
????????????ConnectLinePoints(pathFigure,?Points[Points.Count?-?2],?Points[Points.Count?-?1],?backPoint,?ArcRoundness,?UseRoundnessPercentage);
????????????var?line2?=?new?QuadraticBezierSegment?{?Point1?=?Points[0],?Point2?=?nextPoint?};
????????????pathFigure.Segments.Add(line2);
????????????pathFigure.StartPoint?=?nextPoint;
????????}
????????private?static?void?ConnectLinePoints(PathFigure?pathFigure,?Point?p1,?Point?p2,?Point?p3,?double?roundness,?bool?usePercentage)
????????{
????????????//The?point?on?the?first?segment?where?the?curve?will?start.
????????????Point?backPoint;
????????????//The?point?on?the?second?segment?where?the?curve?will?end.
????????????Point?nextPoint;
????????????if?(usePercentage)
????????????{
????????????????backPoint?=?GetPointAtDistancePercent(p1,?p2,?roundness,?false);
????????????????nextPoint?=?GetPointAtDistancePercent(p2,?p3,?roundness,?true);
????????????}
????????????else
????????????{
????????????????backPoint?=?GetPointAtDistance(p1,?p2,?roundness,?false);
????????????????nextPoint?=?GetPointAtDistance(p2,?p3,?roundness,?true);
????????????}
????????????int?lastSegmentIndex?=?pathFigure.Segments.Count?-?1;
????????????//Set?the?ending?point?of?the?first?segment.
????????????((LineSegment)(pathFigure.Segments[lastSegmentIndex])).Point?=?backPoint;
????????????//Create?and?add?the?curve.
????????????var?curve?=?new?QuadraticBezierSegment?{?Point1?=?p2,?Point2?=?nextPoint?};
????????????pathFigure.Segments.Add(curve);
????????????//Create?and?add?the?new?segment.
????????????var?line?=?new?LineSegment?{?Point?=?p3?};
????????????pathFigure.Segments.Add(line);
????????}
????????private?static?Point?GetPointAtDistancePercent(Point?p1,?Point?p2,?double?distancePercent,?bool?firstPoint)
????????{
????????????double?rap?=?firstPoint???distancePercent?/?100?:?(100?-?distancePercent)?/?100;
????????????return?new?Point(p1.X?+?(rap?*?(p2.X?-?p1.X)),?p1.Y?+?(rap?*?(p2.Y?-?p1.Y)));
????????}
????????private?static?Point?GetPointAtDistance(Point?p1,?Point?p2,?double?distance,?bool?firstPoint)
????????{
????????????double?segmentLength?=?Math.Sqrt(Math.Pow((p2.X?-?p1.X),?2)?+?Math.Pow((p2.Y?-?p1.Y),?2));
????????????//The?distance?cannot?be?greater?than?half?of?the?length?of?the?segment
????????????if?(distance??(segmentLength?/?2))
????????????????distance?=?segmentLength?/?2;
????????????double?rap?=?firstPoint???distance?/?segmentLength?:?(segmentLength?-?distance)?/?segmentLength;
????????????return?new?Point(p1.X?+?(rap?*?(p2.X?-?p1.X)),?p1.Y?+?(rap?*?(p2.Y?-?p1.Y)));
????????}
????????#endregion
????}
第二步:前端XMAL文件进行使用,代码如下:
????Grid
????????Grid.RowDefinitions
????????????RowDefinition?Height="20"/RowDefinition
????????????RowDefinition?Height="100"/RowDefinition
????????????RowDefinition?Height="64"/RowDefinition
????????/Grid.RowDefinitions
????????local:RoundedCornersPolygon?Points="7,0?14,8?7,16,0?8"??StrokeThickness="1"?ArcRoundness="1"?UseRoundnessPercentage="False"?Stroke="Black"?IsClosed="True"??HorizontalAlignment="Center"/
????????/local:RoundedCornersPolygon
????????local:RoundedCornersPolygon?Points="14,0?28,16?14,32,0?16"?Grid.Row="1"??StrokeThickness="1"?ArcRoundness="3.5"?UseRoundnessPercentage="False"?Stroke="Black"?IsClosed="True"??HorizontalAlignment="Center"/
????????StackPanel?Grid.Row="2"?Orientation="Horizontal"?HorizontalAlignment="Center"
????????????local:RoundedCornersPolygon?Points="14,0?28,16?14,32,0?16"?Margin="10,10,0,0"?StrokeThickness="1"?ArcRoundness="3.5"?UseRoundnessPercentage="False"?Stroke="Black"?IsClosed="True"/
????????????local:RoundedCornersPolygon?Points="14,0?28,16?14,32,0?16"?Margin="10,10,0,0"??StrokeThickness="1"?ArcRoundness="3.5"?UseRoundnessPercentage="False"?Stroke="Black"?IsClosed="True"?Fill="#ccc"/
????????????local:RoundedCornersPolygon?Points="14,0?28,16?14,32,0?16"?Margin="10,10,0,0"??StrokeThickness="1"?ArcRoundness="3.5"?UseRoundnessPercentage="False"?Stroke="Black"?IsClosed="True"?Fill="#ccc"/
????????/StackPanel
????/Grid
WPF 将图片保存为XML文件
这个，其实很简单的。就是一个base64的编码和解码过程。
我特意为你写了实例，在我的博客里，地址如下：
WPF中BitmapImage对象切割
在WPF中可以使用Int32Rect来切割图片，当然你要转换也可以，刚刚回复了你的评论，写得很简略，这里给你一个转换的方法吧：
Bitmap BitmapSourceToBitmap(BitmapSource source)
{
System.Drawing.Bitmap bitmap = new System.Drawing.Bitmap(source.PixelWidth, source.PixelHeight, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
BitmapData bitmapData = bitmap.LockBits(new System.Drawing.Rectangle(System.Drawing.Point.Empty, bitmap.Size), System.Drawing.Imaging.ImageLockMode.WriteOnly, System.Drawing.Imaging.PixelFormat.Format32bppPArgb);
source.CopyPixels(Int32Rect.Empty, bitmapData.Scan0, bitmapData.Height * bitmapData.Stride, bitmapData.Stride);
bitmap.UnlockBits(bitmapData);
return bitmap;
}
希望对你有帮助，有疑问请追问或是Hi