/// <summary>
/// 绘制选择状态;
/// </summary>
/// <param name="canvas"></param>
/// <param name="canvasProxy"></param>
private void DrawSelectedState(ICanvas canvas, ICanvasScreenConvertable canvasProxy)
{
if (!IsSelected)
{
return;
}
if (Rectangle2D == null)
{
return;
}
//绘制四边的中点;
var lines = Rectangle2D.GetLines();
var rectLength = TolerantedScreenLength;
foreach (var line in lines)
{
var point = line.MiddlePoint;
var rect = NativeGeometryExtensions.GetNativeSuroundingScreenRect(canvasProxy.ToScreen(point), rectLength, rectLength);
canvas.NativeDrawRectangle(rect, HighLightEllipseColorBrush, HighLightLinePen);
}
//绘制中心;
var centerPointX = Rectangle2D.GetVertexes().Average(p => p.X);
var centerPointY = Rectangle2D.GetVertexes().Average(p => p.Y);
var centerScreenPoint = canvasProxy.ToScreen(new Vector2D(centerPointX, centerPointY));
var centerRect = NativeGeometryExtensions.GetNativeSuroundingScreenRect(centerScreenPoint, rectLength, rectLength);
canvas.NativeDrawRectangle(centerRect, HighLightEllipseColorBrush, HighLightLinePen);
}
public override bool PointInObject(Vector2D point, ICanvasScreenConvertable canvasProxy)
{
if (point == null)
{
throw new ArgumentNullException(nameof(point));
}
if (canvasProxy == null)
{
throw new ArgumentNullException(nameof(canvasProxy));
}
if (Ellipse2D == null)
{
return(false);
}
#if DEBUG
#endif
//判断是否与圆心有关系;
var centerScreenPosition = canvasProxy.ToScreen(Ellipse2D.Center);
var centerScreenRect = NativeGeometryExtensions.GetNativeSuroundingScreenRect(
centerScreenPosition,
TolerantedScreenLength,
TolerantedScreenLength
);
if (centerScreenRect.Contains(canvasProxy.ToScreen(point)))
{
return(true);
}
//若是圆,则通过点到圆心的距离判断;
if (Ellipse2D.RadiusX == Ellipse2D.RadiusY)
{
var screenDis = canvasProxy.ToScreen(Ellipse2D.Center.Distance(point));
var screenRadius = canvasProxy.ToScreen(Ellipse2D.RadiusX);
//若半径小于误差值,则判断距离是否小于误差值;
if (screenRadius < TolerantedScreenLength)
{
return(screenDis < TolerantedScreenLength);
}
//判断是否处于圆周上;
else
{
return(screenDis > screenRadius - TolerantedScreenLength &&
screenDis < screenRadius + TolerantedScreenLength);
}
}
//To-Do,椭圆,未完成;
else
{
return(Ellipse2D.Contains(point));
}
}
public override bool PointInObject(Vector2D point, ICanvasScreenConvertable canvasProxy)
{
if (point == null)
{
throw new ArgumentNullException(nameof(point));
}
if (canvasProxy == null)
{
throw new ArgumentNullException(nameof(canvasProxy));
}
if (Rectangle2D == null)
{
return(false);
}
var screenPoint = canvasProxy.ToScreen(point);
//判断与中心的关系;
var centerScreenPoint = canvasProxy.ToScreen(Rectangle2D.Center);
var screenRect = Tida.Canvas.Infrastructure.Utils.NativeGeometryExtensions.GetNativeSuroundingScreenRect(
centerScreenPoint,
TolerantedScreenLength,
TolerantedScreenLength
);
if (screenRect.Contains(screenPoint))
{
return(true);
}
//判断与四边的关系;
var lines = Rectangle2D.GetLines();
var screenStartPoint = new Vector2D();
var screenEndPoint = new Vector2D();
foreach (var line in lines)
{
canvasProxy.ToScreen(line.Start, screenStartPoint);
canvasProxy.ToScreen(line.End, screenEndPoint);
var screenLine2D = new Line2D(
screenStartPoint, screenEndPoint
);
if (screenLine2D.Distance(screenPoint) < TolerantedScreenLength)
{
return(true);
}
}
return(false);
}
/// <summary>
/// 绘制某位置的选中状态(使用一个矩形);
/// </summary>
/// <param name="point"></param>
public static void DrawSelectedPointState(Vector2D point, ICanvas canvas, ICanvasScreenConvertable canvasProxy)
{
if (point == null)
{
throw new ArgumentNullException(nameof(point));
}
if (canvas == null)
{
throw new ArgumentNullException(nameof(canvas));
}
if (canvasProxy == null)
{
throw new ArgumentNullException(nameof(canvasProxy));
}
//得到以某点为中心的视图矩形;
var rect = NativeGeometryExtensions.GetNativeSuroundingScreenRect(
canvasProxy.ToScreen(point),
TolerantedScreenLength,
TolerantedScreenLength
);
canvas.NativeDrawRectangle(
rect,
HighLightRectColorBrush,
HighLightLinePen
);
}
/// <summary>
/// 交点绘制;
/// </summary>
/// <param name="canvas"></param>
/// <param name="canvasProxy"></param>
public override void Draw(ICanvas canvas, ICanvasScreenConvertable canvasProxy)
{
if (canvas == null)
{
throw new ArgumentNullException(nameof(canvas));
}
if (canvasProxy == null)
{
throw new ArgumentNullException(nameof(canvasProxy));
}
//画叉;
var screenPosition = canvasProxy.ToScreen(Position);
var rectLength = HighLightRectLength;
//从左上到右下;
var line1 = new Line2D(
new Vector2D(screenPosition.X - rectLength, screenPosition.Y - rectLength),
new Vector2D(screenPosition.X + rectLength, screenPosition.Y + rectLength)
);
//从左下到右上;
var line2 = new Line2D(
new Vector2D(screenPosition.X - rectLength, screenPosition.Y + rectLength),
new Vector2D(screenPosition.X + rectLength, screenPosition.Y - rectLength)
);
canvas.NativeDrawLine(IntersectPen, line1);
canvas.NativeDrawLine(IntersectPen, line2);
}
public override void Draw(ICanvas canvas, ICanvasScreenConvertable canvasProxy)
{
var screenPosition = canvasProxy.ToScreen(Position);
var rectLength = HighLightRectLength;
var rect = NativeGeometryExtensions.GetNativeSuroundingScreenRect(screenPosition, rectLength, rectLength);
canvas.NativeDrawRectangle(rect, Background, LinePen);
}
/// <summary>
/// 判断画布中某个位置是否在某个圆弧附近;
/// </summary>
/// <param name="arc2D"></param>
/// <param name="point"></param>
/// <param name="canvasProxy"></param>
/// <returns></returns>
public static bool PointInArc(Arc2D arc2D, Vector2D point, ICanvasScreenConvertable canvasProxy)
{
if (canvasProxy == null)
{
return(false);
}
if (arc2D == null)
{
return(false);
}
//以视图单位为标准进行判断;
var screenPoint = canvasProxy.ToScreen(point);
var arcCenterScreenPoint = canvasProxy.ToScreen(arc2D.Center);
var screenRadius = canvasProxy.ToScreen(arc2D.Radius);
if (Math.Abs(arcCenterScreenPoint.Distance(screenPoint) - screenRadius) > TolerantedScreenLength)
{
return(false);
}
var centerToPointDirection = new Line2D(arc2D.Center, point).Direction;
if (Extension.AreEqual(centerToPointDirection.Modulus(), 0))
{
return(false);
}
var centerToPointAngle = Extension.AngleFrom(
new Vector3D(centerToPointDirection.X, centerToPointDirection.Y, 0),
Vector3D.BasisX
);
if (arc2D.Angle > 0)
{
return(centerToPointAngle < arc2D.StartAngle + arc2D.Angle && centerToPointAngle > arc2D.StartAngle);
}
else
{
return(centerToPointAngle < arc2D.StartAngle && centerToPointAngle > arc2D.StartAngle + arc2D.Angle);
}
}
/// <summary>
/// 判断画布中某个位置是否在某个线段附近;
/// </summary>
/// <param name="line2D"></param>
/// <param name="point"></param>
/// <param name="canvasProxy"></param>
/// <returns></returns>
public static bool PointInLine(Line2D line2D, Vector2D point, ICanvasScreenConvertable canvasProxy)
{
if (canvasProxy == null)
{
return(false);
}
if (line2D == null)
{
return(false);
}
//以视图单位为标准进行判断;
var screenPoint = canvasProxy.ToScreen(point);
var screenLine2D = new Line2D(
canvasProxy.ToScreen(line2D.Start),
canvasProxy.ToScreen(line2D.End)
);
return(screenLine2D.Distance(screenPoint) < TolerantedScreenLength);
}
/// <summary>
/// 判断数学坐标中某个位置是否在另一个位置的附近;
/// </summary>
/// <param name="screenPosition0"></param>
/// <param name="screenPosition1"></param>
/// <returns></returns>
public static bool GetIsSurround(Vector2D position0, Vector2D position1, ICanvasScreenConvertable canvasProxy)
{
if (canvasProxy == null)
{
throw new ArgumentNullException(nameof(canvasProxy));
}
if (position0 == null)
{
throw new ArgumentNullException(nameof(position0));
}
if (position1 == null)
{
throw new ArgumentNullException(nameof(position1));
}
return(GetIsSurround(canvasProxy.ToScreen(position0), canvasProxy.ToScreen(position1)));
}
/// <summary>
/// 绘制选择状态;
/// </summary>
/// <param name="canvas"></param>
private void DrawSelectedState(ICanvas canvas, ICanvasScreenConvertable canvasProxy)
{
if (!IsSelected)
{
return;
}
if (Ellipse2D == null)
{
return;
}
if (Ellipse2D.Center == null)
{
return;
}
var centerScreenPoint = canvasProxy.ToScreen(Ellipse2D.Center);
var screenRadiusX = canvasProxy.ToScreen(Ellipse2D.RadiusX);
var screenRadiusY = canvasProxy.ToScreen(Ellipse2D.RadiusY);
var rectLength = TolerantedScreenLength;
//依次绘制左、下、右、上、圆心的矩形;
var points = new Vector2D[] {
new Vector2D(centerScreenPoint.X - screenRadiusX, centerScreenPoint.Y),
new Vector2D(centerScreenPoint.X, centerScreenPoint.Y - screenRadiusY),
new Vector2D(centerScreenPoint.X + screenRadiusX, centerScreenPoint.Y),
new Vector2D(centerScreenPoint.X, centerScreenPoint.Y + screenRadiusY),
new Vector2D(centerScreenPoint.X, centerScreenPoint.Y),
};
foreach (var point in points)
{
var rect = NativeGeometryExtensions.GetNativeSuroundingScreenRect(point, rectLength, rectLength);
canvas.NativeDrawRectangle(rect, HighLightEllipseColorBrush, HighLightLinePen);
}
}
/// <summary>
/// 将工程数学坐标转化为视图(以左上为原点)坐标;
/// </summary>
/// <param name="unitPoint"></param>
/// <returns></returns>
public static Vector2D ToScreen(this ICanvasScreenConvertable canvasProxy, Vector2D unitPoint)
{
if (canvasProxy == null)
{
throw new ArgumentNullException(nameof(canvasProxy));
}
if (unitPoint == null)
{
throw new ArgumentNullException(nameof(unitPoint));
}
var screenPoint = new Vector2D();
canvasProxy.ToScreen(unitPoint, screenPoint);
return(screenPoint);
}
public override Rectangle2D2 GetNativeBoundingRect(ICanvasScreenConvertable canvasProxy)
{
if (canvasProxy == null)
{
throw new ArgumentNullException(nameof(canvasProxy));
}
var screenPosition = canvasProxy.ToScreen(Position);
var rect = NativeGeometryExtensions.GetNativeSuroundingScreenRect(
screenPosition,
HighLightRectLength,
HighLightRectLength
);
return(rect);
}
public override void Draw(ICanvas canvas, ICanvasScreenConvertable canvasProxy)
{
base.Draw(canvas, canvasProxy);
//检查两个关键位置是否为空;
if (MousePositionTracker.LastMouseDownPosition == null || MousePositionTracker.CurrentHoverPosition == null)
{
return;
}
//绘制当前随鼠标位置移动的编辑线段;
//绘制本次尚未完成的线段的起始点小正方形;
var lastMouseDownScreenPosition = canvasProxy.ToScreen(MousePositionTracker.LastMouseDownPosition);
var sideLength = HighLightRectLength;
var startEditRect = NativeGeometryExtensions.GetNativeSuroundingScreenRect(lastMouseDownScreenPosition, sideLength, sideLength);
canvas.NativeDrawRectangle(startEditRect, HighLightRectColorBrush, LinePen);
//在外部加入了动态输入,此时显示线段编辑状态多余;
//DrawEditingLineState(canvas, canvasProxy);
}
/// <summary>
/// 绘制线段;
/// </summary>
/// <param name="pen"></param>
/// <param name="line"></param>
public void DrawLine(Pen pen, Line2D line)
{
if (pen == null)
{
return;
}
if (line == null)
{
throw new ArgumentNullException(nameof(line));
}
ValidateDrawingContext();
var screenPoint1 = _canvasProxy.ToScreen(line.Start);
var screenPoint2 = _canvasProxy.ToScreen(line.End);
//平台转换后再进行绘制;
DrawingContext.DrawLine(
PenAdapter.ConverterToSystemPen(pen),
Vector2DAdapter.ConvertToSystemPoint(screenPoint1),
Vector2DAdapter.ConvertToSystemPoint(screenPoint2)
);
}
/// <summary>
/// 线段的辅助判断;
/// 依次判断以下情况:1.中点 2.端点
/// </summary>
public static ISnapShape GetLine2DSnapShape(Line2D line2D, Vector2D position, ICanvasScreenConvertable canvasProxy)
{
if (line2D == null)
{
throw new ArgumentNullException(nameof(line2D));
}
if (position == null)
{
throw new ArgumentNullException(nameof(position));
}
if (canvasProxy == null)
{
throw new ArgumentNullException(nameof(canvasProxy));
}
/*判断是否是三点中一个附近的点*/
var startPoint = line2D.Start;
var endPoint = line2D.End;
if (startPoint == null)
{
throw new ArgumentNullException(nameof(startPoint));
}
if (endPoint == null)
{
throw new ArgumentNullException(nameof(endPoint));
}
if (position == null)
{
throw new ArgumentNullException(nameof(position));
}
if (canvasProxy == null)
{
throw new ArgumentNullException(nameof(canvasProxy));
}
var middlePoint = (startPoint + endPoint) / 2;
Vector2D[] points = { startPoint, endPoint, middlePoint };
var screenPoint = new Vector2D();
var screenStart = new Vector2D();
var screenEnd = new Vector2D();
var lineDir = (endPoint - startPoint).Normalize();
var verticalVector = new Vector2D(-lineDir.Y, lineDir.X);
var screenPosition = canvasProxy.ToScreen(position);
foreach (var point in points)
{
canvasProxy.ToScreen(point, screenPoint);
if (!GetIsSurround(screenPosition, screenPoint))
{
continue;
}
var unitLineLength = canvasProxy.ToUnit(4 * TolerantedScreenLength);
var start = point - verticalVector * unitLineLength;
var end = point + verticalVector * unitLineLength;
//作垂直于原线段的垂线;
canvasProxy.ToScreen(start, screenStart);
canvasProxy.ToScreen(end, screenEnd);
var lineSnapShape = new ScreenLineSnapShape(new Line2D(screenStart, screenEnd), point);
//若命中点为中点,则该垂线为中垂线,则修改颜色;
if (point == middlePoint)
{
lineSnapShape.LinePen = MiddleLinePen;
}
return(lineSnapShape);
}
return(null);
}
