protected override DrawObject[] TrimDrawObject(Line line, DrawObjectTrimingInfo trimingInfo)
{
Vector2D[] intersectPositions = trimingInfo.IntersectPositions;
Rectangle2D2 trimArea = trimingInfo.TrimArea;
if (line == null)
{
return(null);
}
if (intersectPositions == null)
{
return(null);
}
if (trimArea == null)
{
return(null);
}
//将交点集合筛选(需在线段上,不包括端点),并沿线段起始到终止方向进行排序;
intersectPositions = intersectPositions.
Where(p => p.IsInLine(line.Line2D)).
OrderBy(p => p.Distance(line.Line2D.Start)).
ToArray();
///得到矩形与线段的所有交点(最多两个)，通过该交点集合的与<param name="intersectPositions"/>的关系，进行裁剪;
var rectInserserctPositions = trimArea.GetLines().
Select(p => p.Intersect(line.Line2D)).
Where(p => p != null).
Distinct(Vector2DEqualityComparer.StaticInstance).
ToArray();
return(GetTrimedLineWithIntersectPositions(line, intersectPositions, rectInserserctPositions));
}
public override bool ObjectInRectangle(Rectangle2D2 rect, ICanvasScreenConvertable canvasProxy, bool anyPoint)
{
if (rect == null)
{
throw new ArgumentNullException(nameof(rect));
}
if (Ellipse2D == null)
{
return(false);
}
//无论是否为任意选中,若包含了,则能够选中;
if (rect.Contains(Ellipse2D.Center) && rect.GetLines().All(p => p.Distance(Ellipse2D.Center) >= Ellipse2D.RadiusX))
{
return(true);
}
//若为任意点选中,矩形的四个顶点中,存在任意两点任意一点在椭圆内即可;
if (anyPoint && rect.GetLines().Any(p => {
var intersectPoints = Extension.IntersectWithLine(Ellipse2D, p);
return((intersectPoints?.Length ?? 0) != 0);
}))
{
return(rect.GetVertexes().Any(p => Ellipse2D.Contains(p)));
}
return(false);
}
public Rectangle(Rectangle2D2 rectangle2D)
{
if (rectangle2D == null)
{
throw new ArgumentNullException(nameof(rectangle2D));
}
this.Rectangle2D = rectangle2D;
}
/// <summary>
/// 绘制矩形;
/// </summary>
/// <param name="brush">填充颜色</param>
/// <param name="pen"></param>
/// <param name="rectangle"></param>
public void DrawRectangle(Rectangle2D2 rectangle, Brush brush, Pen pen)
{
if (rectangle == null)
{
throw new ArgumentNullException(nameof(rectangle));
}
ValidateDrawingContext();
DrawFill(rectangle.GetVertexes(), brush, pen);
}
/// <summary>
/// 设定矩形数据核心;
/// </summary>
/// <param name="rectangle2D"></param>
private void SetRetangle2DCore(Rectangle2D2 rectangle2D)
{
if (rectangle2D == null)
{
throw new ArgumentNullException(nameof(rectangle2D));
}
_rectangle2D = rectangle2D;
RaiseVisualChanged();
}
protected override void OnMouseDown(MouseDownEventArgs e)
{
if (e == null)
{
throw new ArgumentNullException(nameof(e));
}
if (e.Position == null)
{
throw new ArgumentException($"The {e.Position} of {nameof(MouseDownEventArgs)} can't be null.");
}
e.Handled = true;
if (CanvasContext.ActiveLayer == null)
{
throw new InvalidOperationException($"The {CanvasContext.ActiveLayer} of {nameof(ICanvasContextEx )} can't be null.");
}
var thisPosition = e.Position;
if (thisPosition == null)
{
return;
}
//若上次按下位置为空,则记录新的点;
if (_lastMouseDownPosition == null)
{
_lastMouseDownPosition = thisPosition;
}
//否则将创建一个新的矩形;
else
{
//若对角线两端的横坐标或纵坐标相等,将不能构成一个矩形;
if (_lastMouseDownPosition.X == thisPosition.X || _lastMouseDownPosition.Y == thisPosition.Y)
{
return;
}
//根据四个顶点创建矩形;
var middleLineY = (thisPosition.Y + _lastMouseDownPosition.Y) / 2;
var rect2D = new Rectangle2D2(
new Line2D(
new Vector2D(_lastMouseDownPosition.X, middleLineY),
new Vector2D(thisPosition.X, middleLineY)
),
Math.Abs(thisPosition.Y - _lastMouseDownPosition.Y)
);
var rect = new Rectangle(rect2D);
AddDrawObjectToUndoStack(rect);
_lastMouseDownPosition = null;
}
}
/// <summary>
/// 得到以某视图坐标为中心的视图矩形;
/// </summary>
/// <param name="nativeCenterRectPoint">以视图为准的中心坐标</param>
/// <param name="width">宽度</param>
/// <param name="height">高度</param>
/// <returns></returns>
public static Rectangle2D2 GetNativeSuroundingScreenRect(Vector2D nativeCenterRectPoint, double width, double height)
{
if (nativeCenterRectPoint == null)
{
throw new ArgumentNullException(nameof(nativeCenterRectPoint));
}
var surroundingRect = Rectangle2D2.CreateEmpty();
GetNativeSuroundingScreenRect(nativeCenterRectPoint, width, height, surroundingRect);
return(surroundingRect);
}
/// <summary>
/// 检查某个坐标是否处于某个矩形内部;
/// </summary>
/// <param name="rect"></param>
/// <param name="point"></param>
/// <returns></returns>
public static bool Contains(this Rectangle2D2 rect, Vector2D point)
{
if (rect == null)
{
throw new ArgumentNullException(nameof(rect));
}
if (point == null)
{
throw new ArgumentNullException(nameof(point));
}
return(point.IsInRegion(rect.GetLines().ToList()));
}
/// <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)
);
}
public ISnapShape MatchSnapShape(DrawObject[] drawObjects, Vector2D position, ICanvasContext canvasContext)
{
if (drawObjects == null)
{
return(null);
}
#if DEBUG
//position = new Vector2D(0, 0);
#endif
var screenPosition = canvasContext.CanvasProxy.ToScreen(position);
var rect = Rectangle2D2.CreateEmpty();
//双游标两两遍历;
for (int i = 0; i < drawObjects.Length - 1; i++)
{
for (int j = i + 1; j < drawObjects.Length; j++)
{
var intersectPositions = DrawObjectIntersectRule.GetIntersectPositions(drawObjects[i], drawObjects[j]);
if (intersectPositions == null)
{
continue;
}
foreach (var intersectPosition in intersectPositions)
{
NativeGeometryExtensions.GetNativeSuroundingScreenRect(
canvasContext.CanvasProxy.ToScreen(intersectPosition),
TolerantedScreenLength,
TolerantedScreenLength,
rect
);
if (rect.Contains(screenPosition))
{
return(new IntersectSnapPoint(intersectPosition));
}
}
}
}
return(null);
}
/// <summary>
/// 判断某个矩形与某个线段的包含或相交(当<paramref name="anyPoint"/>为真时)关系;
/// </summary>
/// <param name="line2D"></param>
/// <param name="rect"></param>
/// <param name="anyPoint"></param>
/// <returns></returns>
public static bool LineInRectangle(Line2D line2D, Rectangle2D2 rect, bool anyPoint)
{
if (line2D == null)
{
return(false);
}
//若在完全在矩形内部,则返回为真;
if (rect.Contains(line2D.Start) &&
rect.Contains(line2D.End))
{
return(true);
}
//若任意可选为真,则矩形任意一条边与之存在相交即可;
else if (anyPoint)
{
return(rect.GetLines()?.Any(p => p.Intersect(line2D) != null) ?? false);
}
return(false);
}
public override bool ObjectInRectangle(Rectangle2D2 rect, ICanvasScreenConvertable canvasProxy, bool anyPoint)
{
if (rect == null)
{
throw new ArgumentNullException(nameof(rect));
}
if (Rectangle2D == null)
{
return(false);
}
//根据四个顶点的位置判断与指定矩形的包含关系;
if (anyPoint)
{
return(Rectangle2D.GetVertexes()?.Any(p => rect.Contains(p)) ?? false);
}
else
{
return(Rectangle2D.GetVertexes()?.All(p => rect.Contains(p)) ?? false);
}
}
public override void Draw(ICanvas canvas, ICanvasScreenConvertable canvasProxy)
{
if (canvas == null)
{
throw new ArgumentNullException(nameof(canvas));
}
base.Draw(canvas, canvasProxy);
if (_lastMouseDownPosition == null || _currentMousePosition == null)
{
return;
}
//若对角线的两端纵坐标或横坐标相等,则不进行绘制;
if (_currentMousePosition.X == _lastMouseDownPosition.X || _lastMouseDownPosition.Y == _currentMousePosition.Y)
{
return;
}
//绘制编辑的矩形的预览状态;
var middleLineY = (_currentMousePosition.Y + _lastMouseDownPosition.Y) / 2;
var rect2D = new Rectangle2D2(
new Line2D(
new Vector2D(_lastMouseDownPosition.X, middleLineY),
new Vector2D(_currentMousePosition.X, middleLineY)
),
Math.Abs(_currentMousePosition.Y - _lastMouseDownPosition.Y)
);
canvas.DrawRectangle(
rect2D,
NormalRectColorBrush,
NormalRectPen
);
}
/// <summary>
/// 根据裁剪对象<paramref name="trimingDrawObjects"/>和裁剪区域<paramref name="trimArea"/>,
/// 对被裁剪对象<paramref name="toBeTrimedDrawObject"/>进行裁剪,
/// 返回裁剪后的对象;
/// </summary>
/// <param name="canvasContext"></param>
/// <param name="trimArea"></param>
private DrawObject[] GetTrimedOrExtendedDrawObjects(
DrawObject toBeTrimedDrawObject,
IEnumerable <DrawObject> trimingDrawObjects,
Rectangle2D2 trimArea
)
{
if (toBeTrimedDrawObject == null)
{
throw new ArgumentNullException(nameof(toBeTrimedDrawObject));
}
if (trimingDrawObjects == null)
{
throw new ArgumentNullException(nameof(trimingDrawObjects));
}
///得到所有被裁剪绘制对象与裁剪对象的交点;
var thisIntersectPositions = trimingDrawObjects.SelectMany(
p => DrawObjectIntersectRules.SelectMany(
q => q.GetIntersectPositions(toBeTrimedDrawObject, p, IsExtendMode) ?? Enumerable.Empty <Vector2D>()
)
).ToArray();
if (thisIntersectPositions.Length == 0)
{
return(null);
}
DrawObject[] thisCreatedDrawObjects = null;
//若非延伸模式,则进行裁剪计算;
if (!IsExtendMode)
{
//找到对应的裁剪工具;
var trimTool = DrawObjectTrimTools.FirstOrDefault(p => p.CheckIsValidDrawObject(toBeTrimedDrawObject));
if (trimTool == null)
{
return(null);
}
//进行裁剪;
thisCreatedDrawObjects = trimTool.TrimDrawObject(
new DrawObjectTrimingInfo {
TrimedDrawObject = toBeTrimedDrawObject,
TrimingDrawObjects = trimingDrawObjects.ToArray(),
IntersectPositions = thisIntersectPositions,
TrimArea = trimArea
}
);
}
//否则延伸计算;
else
{
var extendTool = DrawObjectExtendTools.FirstOrDefault(p => p.CheckIsValidDrawObject(toBeTrimedDrawObject));
if (extendTool == null)
{
return(null);
}
//进行延伸;
var createdDrawObject = extendTool.ExtendDrawObject(
new DrawObjectExtendInfo {
ExtendedDrawObject = toBeTrimedDrawObject,
ExtendingDrawObjects = trimingDrawObjects.ToArray(),
ExtendArea = trimArea,
IntersectPositions = thisIntersectPositions
}
);
if (createdDrawObject == null)
{
return(null);
}
thisCreatedDrawObjects = new DrawObject[] { createdDrawObject };
}
//返回裁剪后的绘制对象;
return(thisCreatedDrawObjects);
}
/// <summary>
/// 将线段限制到可见范围内;
/// </summary>
/// <param name="line">原坐标</param>
/// <returns>返回可见的线段</returns>
private static Line2D GetLimitedLine2D(Line2D line, Rectangle2D2 rect)
{
var visibleLine = new Line2D(line.Start, line.End);
return(visibleLine);
}
public static Line2D GetExtendLineWithIntersectPositions(Line2D line2D, Line2D[] extendLines, Vector2D[] intersectPositions, Rectangle2D2 rectIntersect)
{
if (extendLines.Length == 0)
{
return(null);
}
if (rectIntersect == null)
{
return(null);
}
if (intersectPositions.Length == 0)
{
return(null);
}
if (rectIntersect.Contains(line2D.Start) && rectIntersect.Contains(line2D.End) && intersectPositions.Length == 2)
{
var p1 = intersectPositions[0];
var p2 = intersectPositions[1];
if (line2D.Start.IsInLine(Line2D.Create(p1, line2D.End)))
{
return(Line2D.Create(p1, p2));
}
return(Line2D.Create(p2, p1));
}
if (rectIntersect.Contains(line2D.Start))
{
return(Line2D.Create(intersectPositions.First(), line2D.End));
}
if (rectIntersect.Contains(line2D.End))
{
return(Line2D.Create(line2D.Start, intersectPositions.First()));
}
return(null);
}
public DragSelectMouseMoveEventArgs(Rectangle2D2 rectangle2D, Vector2D position) : base(position)
{
}
/// <summary> /// 判定绘制对象是否在某个矩形区域内; /// </summary> /// <param name="rect">区域(工程数学坐标为准)</param> /// <param name="anyPoint">是否模糊匹配,即判定相交是否满足条件</param> /// <param name="canvasProxy">视图单位转化器,可用于内部进行误差判断</param> /// <returns></returns> public abstract bool ObjectInRectangle(Rectangle2D2 rect, ICanvasScreenConvertable canvasProxy, bool anyPoint);
public static Line2D GetExtendMemberWithIntersectPositions(Line2D line2D, Line2D[] extendLines, Vector2D[] intersectPositions, Rectangle2D2 rectIntersect, double width, double gap)
{
if (extendLines.Length == 0)
{
return(null);
}
if (rectIntersect == null)
{
return(null);
}
if (intersectPositions.Length == 0)
{
return(null);
}
if (rectIntersect.Contains(line2D.Start) && rectIntersect.Contains(line2D.End) && intersectPositions.Length == 2)
{
var p1 = intersectPositions[0];
var p2 = intersectPositions[1];
var line1 = extendLines.First(x => p1.IsInLine(x));
var angle1 = line1.Direction.AngleWith(line2D.Direction);
var newP1 = GetExtendPoint(p1, -line2D.Direction, angle1, width, gap);
var line2 = extendLines.First(x => p2.IsInLine(x));
var angle2 = line2.Direction.AngleWith(line2D.Direction);
var newP2 = GetExtendPoint(p2, line2D.Direction, angle2, width, gap);
if (line2D.Start.IsInLine(Line2D.Create(p1, line2D.End)))
{
return(Line2D.Create(newP1, newP2));
}
return(Line2D.Create(newP2, newP1));
}
if (rectIntersect.Contains(line2D.Start) && line2D.Start.IsInLine(Line2D.Create(intersectPositions.First(), line2D.End)))
{
var angle = line2D.Direction.AngleWith(extendLines[0].Direction);
var newEndPoint = GetExtendPoint(intersectPositions.First(), -line2D.Direction, angle, width, gap);
return(Line2D.Create(newEndPoint, line2D.End));
}
if (rectIntersect.Contains(line2D.End) && line2D.End.IsInLine(Line2D.Create(intersectPositions.First(), line2D.Start)))
{
var angle = line2D.Direction.AngleWith(extendLines[0].Direction);
var newEndPoint = GetExtendPoint(intersectPositions.First(), line2D.Direction, angle, width, gap);
return(Line2D.Create(line2D.Start, newEndPoint));
}
return(null);
}
public override bool ObjectInRectangle(Rectangle2D2 rect, ICanvasScreenConvertable canvasProxy, bool anyPoint)
{
return(LineHitUtils.LineInRectangle(MeasureLineP, rect, anyPoint) ||
LineHitUtils.LineInRectangle(MeasureLineV0, rect, anyPoint) ||
LineHitUtils.LineInRectangle(MeasureLineV1, rect, anyPoint));
}
/// <summary>
/// 得到以某视图坐标为中心的视图矩形;
/// </summary>
/// <param name="nativeCenterRectPoint">以视图为准的中心坐标</param>
/// <param name="width">宽度</param>
/// <param name="height">高度</param>
/// <param name="rectangle2D2">用于写入的矩形实例</param>
/// <returns></returns>
public static void GetNativeSuroundingScreenRect(Vector2D nativeCenterRectPoint, double width, double height, Rectangle2D2 rectangle2D2)
{
if (nativeCenterRectPoint == null)
{
throw new ArgumentNullException(nameof(nativeCenterRectPoint));
}
if (rectangle2D2 == null)
{
throw new ArgumentNullException(nameof(rectangle2D2));
}
rectangle2D2.MiddleLine2D = new Line2D(
new Vector2D(nativeCenterRectPoint.X - width / 2, nativeCenterRectPoint.Y),
new Vector2D(nativeCenterRectPoint.X + width / 2, nativeCenterRectPoint.Y)
);
rectangle2D2.Width = height;
}
/// <summary> /// 判定绘制对象是否在某个矩形区域内; /// </summary> /// <param name="rect">区域(工程数学坐标为准)</param> /// <param name="anyPoint">是否模糊匹配,即判定相交是否满足条件</param> /// <param name="canvasProxy">视图单位转化器,可用于内部进行误差判断</param> /// <returns></returns> public virtual bool ObjectInRectangle(Rectangle2D2 rect, ICanvasScreenConvertable canvasProxy, bool anyPoint) => false;
public DragSelectEventArgs(Vector2D position, Rectangle2D2 rectangle2D, DrawObject[] hitedDrawObjects)
{
Position = position ?? throw new ArgumentNullException(nameof(position));
Rectangle2D = rectangle2D ?? throw new ArgumentNullException(nameof(rectangle2D));
HitedDrawObjects = hitedDrawObjects ?? throw new ArgumentNullException(nameof(hitedDrawObjects));
}
public override bool ObjectInRectangle(Rectangle2D2 rect, ICanvasScreenConvertable canvasProxy, bool anyPoint)
{
return(false);
}