/// <summary>
/// 以视图坐标为标准,绘制椭圆;
/// </summary>
/// <param name="rectangle">以视图坐标为准的矩形</param>
/// <param name="brush">填充色</param>
/// <param name="pen">笔</param>
public void NativeDrawEllipse(Brush brush, Pen pen, Vector2D center, double radiusX, double radiusY)
{
if (center == null)
{
throw new ArgumentNullException(nameof(center));
}
var centerPoint = Vector2DAdapter.ConvertToSystemPoint(center);
DrawingContext.DrawEllipse(
BrushAdapter.ConvertToSystemBrush(brush),
PenAdapter.ConverterToSystemPen(pen),
centerPoint,
radiusX,
radiusY
);
}
/// <summary>
/// 以视图坐标为标准,绘制矩形;
/// </summary>
/// <param name="rectangle">以视图坐标为准的矩形</param>
/// <param name="brush">填充色</param>
/// <param name="pen">笔</param>
public void NativeDrawRectangle(Rectangle2D2 rectangle, Brush brush, Pen pen)
{
if (rectangle == null)
{
throw new ArgumentNullException(nameof(rectangle));
}
ValidateDrawingContext();
var vertexes = rectangle.GetVertexes();
NativeDrawFill(
vertexes.Select(p => Vector2DAdapter.ConvertToSystemPoint(p)),
BrushAdapter.ConvertToSystemBrush(brush),
PenAdapter.ConverterToSystemPen(pen)
);
}
/// <summary>
/// 绘制文字;
/// </summary>
/// <param name="text"></param>
/// <param name="emSize"></param>
/// <param name="foreground"></param>
/// <param name="origin"></param>
public void DrawText(string text, double emSize, Brush foreground, Vector2D origin, double angle = 0)
{
ValidateDrawingContext();
var originScreenPoint = _canvasProxy.ToScreen(origin);
var nativeOriginScreenPoint = Vector2DAdapter.ConvertToSystemPoint(originScreenPoint);
var ft = new SystemMedia.FormattedText(
text,
System.Globalization.CultureInfo.CurrentCulture,
FlowDirection.LeftToRight, TypeFace,
emSize,
BrushAdapter.ConvertToSystemBrush(foreground)
);
DrawFormattedTextCore(ft, origin, angle);
}
/// <summary>
/// 根据所有的点，组成一个封闭区域，且可以填充，并且填充
/// </summary>
/// <param name="points">所有的顶点坐标</param>
/// <param name="brush">区域颜色</param>
private void DrawFill(IEnumerable <Vector2D> points, Brush brush, Pen pen)
{
if (points == null)
{
throw new ArgumentNullException(nameof(points));
}
if (pen == null)
{
throw new ArgumentNullException(nameof(pen));
}
ValidateDrawingContext();
NativeDrawFill(
points.Select(p => ConvertVectorToScreenPoint(p)),
BrushAdapter.ConvertToSystemBrush(brush),
PenAdapter.ConverterToSystemPen(pen)
);
}
public void ExportDrawObjectsAsImg(IEnumerable <DrawObject> drawObjects, ExportImgSetting exportImgSetting)
{
if (drawObjects == null)
{
throw new ArgumentNullException(nameof(drawObjects));
}
if (exportImgSetting == null)
{
throw new ArgumentNullException(nameof(exportImgSetting));
}
if (exportImgSetting.ExportStream == null)
{
throw new ArgumentNullException(nameof(exportImgSetting.ExportStream));
}
var stream = exportImgSetting.ExportStream;
if (!stream.CanWrite)
{
throw new ArgumentException($"{nameof(stream)} can't be written.");
}
var width = exportImgSetting.Width;
var height = exportImgSetting.Height;
var renderTargetBitMap = new RenderTargetBitmap(
width, height,
ScreenResolution,
ScreenResolution,
PixelFormats.Default
);
///使用<see cref="DrawingVisual"/>作为<see cref="Visual"/>参数;
var drawingVisual = new DrawingVisual {
Clip = new RectangleGeometry(new Rect {
Width = width,
Height = height
})
};
var drawingContext = drawingVisual.RenderOpen();
var canvasProxy = new WindowsCanvasScreenConverter {
ActualWidth = width,
ActualHeight = height,
PanScreenPosition = new Vector2D(width / 2, height / 2),
Zoom = 1
};
var canvas = new WindowsCanvas(canvasProxy)
{
DrawingContext = drawingContext
};
var scope = GetScopeWithDrawObjects(drawObjects, width, height);
canvasProxy.Zoom = scope.Zoom;
canvasProxy.PanScreenPosition = scope.PanScreenPosition;
//绘制背景;
if (exportImgSetting.Background != null)
{
drawingContext.DrawRectangle(BrushAdapter.ConvertToSystemBrush(exportImgSetting.Background), null, new Rect(new System.Windows.Size(width, height)));
}
//绘制绘制对象;
foreach (var drawObject in drawObjects.Where(p => exportImgSetting.ExportUnvisible || p.IsVisible))
{
drawObject.Draw(canvas, canvasProxy);
}
drawingContext.Close();
renderTargetBitMap.Render(drawingVisual);
var encoder = new PngBitmapEncoder();
encoder.Frames.Add(BitmapFrame.Create(renderTargetBitMap));
encoder.Save(stream);
#if DEBUG
//if (stream.Length > 0)
//{
// using (var fs = File.Create($"D://Random/{Guid.NewGuid().ToString("P")}.png"))
// {
// stream.Position = 0;
// stream.CopyTo(fs);
// }
//}
#endif
}