private A.Point GetTextOrigin(ShapeStyle style, ref Rect2 rect, ref A.Size size)
{
double ox, oy;
switch (style.TextStyle.TextHAlignment)
{
case TextHAlignment.Left:
ox = rect.X;
break;
case TextHAlignment.Right:
ox = rect.Right - size.Width;
break;
case TextHAlignment.Center:
default:
ox = (rect.Left + rect.Width / 2.0) - (size.Width / 2.0);
break;
}
switch (style.TextStyle.TextVAlignment)
{
case TextVAlignment.Top:
oy = rect.Y;
break;
case TextVAlignment.Bottom:
oy = rect.Bottom - size.Height;
break;
case TextVAlignment.Center:
default:
oy = (rect.Bottom - rect.Height / 2f) - (size.Height / 2f);
break;
}
return new A.Point(ox, oy);
}
/// <summary>
///
/// </summary>
/// <param name="rect"></param>
/// <returns></returns>
public bool IntersectsWith(Rect2 rect)
{
return (rect.Left <= Right)
&& (rect.Right >= Left)
&& (rect.Top <= Bottom)
&& (rect.Bottom >= Top);
}
/// <summary>
///
/// </summary>
/// <param name="point"></param>
/// <param name="rect"></param>
/// <param name="selected"></param>
/// <param name="threshold"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static bool HitTestPoint(XPoint point, Rect2 rect, ISet<BaseShape> selected, double threshold, double dx, double dy)
{
if (ShapeBounds.GetPointBounds(point, threshold, dx, dy).IntersectsWith(rect))
{
if (selected != null)
{
selected.Add(point);
}
else
{
return true;
}
}
return false;
}
/// <summary>
///
/// </summary>
/// <param name="ellipse"></param>
/// <param name="rect"></param>
/// <param name="selected"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static bool HitTestEllipse(XEllipse ellipse, Rect2 rect, ISet<BaseShape> selected, double dx, double dy)
{
if (ShapeBounds.GetEllipseBounds(ellipse, dx, dy).IntersectsWith(rect))
{
if (selected != null)
{
selected.Add(ellipse);
return false;
}
else
{
return true;
}
}
return false;
}
/// <summary>
///
/// </summary>
/// <param name="line"></param>
/// <param name="rect"></param>
/// <param name="selected"></param>
/// <param name="threshold"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static bool HitTestLine(XLine line, Rect2 rect, ISet<BaseShape> selected, double threshold, double dx, double dy)
{
if (ShapeBounds.GetPointBounds(line.Start, threshold, dx, dy).IntersectsWith(rect)
|| ShapeBounds.GetPointBounds(line.End, threshold, dx, dy).IntersectsWith(rect)
|| MathHelpers.LineIntersectsWithRect(rect, new Point2(line.Start.X, line.Start.Y), new Point2(line.End.X, line.End.Y)))
{
if (selected != null)
{
selected.Add(line);
return false;
}
else
{
return true;
}
}
return false;
}
private void DrawGridInternal(AM.DrawingContext dc, AM.Pen stroke, ref Rect2 rect, double offsetX, double offsetY, double cellWidth, double cellHeight, bool isStroked)
{
double ox = rect.X;
double oy = rect.Y;
double sx = ox + offsetX;
double sy = oy + offsetY;
double ex = ox + rect.Width;
double ey = oy + rect.Height;
for (double x = sx; x < ex; x += cellWidth)
{
var p0 = new A.Point(
_scaleToPage(x),
_scaleToPage(oy));
var p1 = new A.Point(
_scaleToPage(x),
_scaleToPage(ey));
DrawLineInternal(dc, stroke, isStroked, ref p0, ref p1);
}
for (double y = sy; y < ey; y += cellHeight)
{
var p0 = new A.Point(
_scaleToPage(ox),
_scaleToPage(y));
var p1 = new A.Point(
_scaleToPage(ex),
_scaleToPage(y));
DrawLineInternal(dc, stroke, isStroked, ref p0, ref p1);
}
}
private static void DrawEllipseInternal(AM.DrawingContext dc, AM.IBrush brush, AM.Pen pen, bool isStroked, bool isFilled, ref Rect2 rect)
{
if (!isFilled && !isStroked)
return;
var r = new A.Rect(rect.X, rect.Y, rect.Width, rect.Height);
var g = new AM.EllipseGeometry(r);
dc.DrawGeometry(
isFilled ? brush : null,
isStroked ? pen : null,
g);
}
private static void DrawRectangleInternal(AM.DrawingContext dc, AM.IBrush brush, AM.Pen pen, bool isStroked, bool isFilled, ref Rect2 rect)
{
if (!isStroked && !isFilled)
return;
var r = new A.Rect(rect.X, rect.Y, rect.Width, rect.Height);
if (isFilled)
{
dc.FillRectangle(brush, r);
}
if (isStroked)
{
dc.DrawRectangle(pen, r);
}
}
private static A.Point DrawLineArrowInternal(AM.DrawingContext dc, AM.Pen pen, AM.IBrush brush, float x, float y, double angle, ArrowStyle style)
{
A.Point pt = default(A.Point);
var rt = APAZ.MatrixHelper.Rotation(angle, new A.Vector(x, y));
double rx = style.RadiusX;
double ry = style.RadiusY;
double sx = 2.0 * rx;
double sy = 2.0 * ry;
switch (style.ArrowType)
{
default:
case ArrowType.None:
{
pt = new A.Point(x, y);
}
break;
case ArrowType.Rectangle:
{
pt = APAZ.MatrixHelper.TransformPoint(rt, new A.Point(x - (float)sx, y));
var rect = new Rect2(x - sx, y - ry, sx, sy);
using (var d = dc.PushPreTransform(rt))
{
DrawRectangleInternal(dc, brush, pen, style.IsStroked, style.IsFilled, ref rect);
}
}
break;
case ArrowType.Ellipse:
{
pt = APAZ.MatrixHelper.TransformPoint(rt, new A.Point(x - (float)sx, y));
using (var d = dc.PushPreTransform(rt))
{
var rect = new Rect2(x - sx, y - ry, sx, sy);
DrawEllipseInternal(dc, brush, pen, style.IsStroked, style.IsFilled, ref rect);
}
}
break;
case ArrowType.Arrow:
{
var pts = new A.Point[]
{
new A.Point(x, y),
new A.Point(x - (float)sx, y + (float)sy),
new A.Point(x, y),
new A.Point(x - (float)sx, y - (float)sy),
new A.Point(x, y)
};
pt = APAZ.MatrixHelper.TransformPoint(rt, pts[0]);
var p11 = APAZ.MatrixHelper.TransformPoint(rt, pts[1]);
var p21 = APAZ.MatrixHelper.TransformPoint(rt, pts[2]);
var p12 = APAZ.MatrixHelper.TransformPoint(rt, pts[3]);
var p22 = APAZ.MatrixHelper.TransformPoint(rt, pts[4]);
DrawLineInternal(dc, pen, style.IsStroked, ref p11, ref p21);
DrawLineInternal(dc, pen, style.IsStroked, ref p12, ref p22);
}
break;
}
return pt;
}
/// <summary>
/// Calculate ellipse line segment intersection points.
/// </summary>
/// <param name="rect"></param>
/// <param name="p1">The line segment start point.</param>
/// <param name="p2">The line segment end point.</param>
/// <param name="onlySegment">Include only line segment solutions.</param>
/// <returns>The ellipse line segment intersection point list.</returns>
public static IList <Point2> FindEllipseSegmentIntersections(Rect2 rect, Point2 p1, Point2 p2, bool onlySegment)
{
if ((rect.Width == 0) || (rect.Height == 0) || ((p1.X == p2.X) && (p1.Y == p2.Y)))
{
return new Point2[] { }
}
;
if (rect.Width < 0)
{
rect.X = rect.Right;
rect.Width = -rect.Width;
}
if (rect.Height < 0)
{
rect.Y = rect.Bottom;
rect.Height = -rect.Height;
}
double cx = rect.Left + rect.Width / 2.0;
double cy = rect.Top + rect.Height / 2.0;
rect.X -= cx;
rect.Y -= cy;
p1.X -= cx;
p1.Y -= cy;
p2.X -= cx;
p2.Y -= cy;
double a = rect.Width / 2.0;
double b = rect.Height / 2.0;
double A = (p2.X - p1.X) * (p2.X - p1.X) / a / a + (p2.Y - p1.Y) * (p2.Y - p1.Y) / b / b;
double B = 2 * p1.X * (p2.X - p1.X) / a / a + 2 * p1.Y * (p2.Y - p1.Y) / b / b;
double C = p1.X * p1.X / a / a + p1.Y * p1.Y / b / b - 1;
var solutions = new List <double>();
double discriminant = B * B - 4 * A * C;
if (discriminant == 0)
{
solutions.Add(-B / 2 / A);
}
else if (discriminant > 0)
{
solutions.Add((-B + Sqrt(discriminant)) / 2 / A);
solutions.Add((-B - Sqrt(discriminant)) / 2 / A);
}
var points = new List <Point2>();
foreach (var t in solutions)
{
if (!onlySegment || ((t >= 0f) && (t <= 1f)))
{
double x = p1.X + (p2.X - p1.X) * t + cx;
double y = p1.Y + (p2.Y - p1.Y) * t + cy;
points.Add(Point2.Create(x, y));
}
}
return(points);
}
/// <summary>
/// Check if line intersects with rectangle using Liang-Barsky line clipping algorithm.
/// </summary>
/// <param name="rect">The rectangle shape.</param>
/// <param name="p0">The line start point.</param>
/// <param name="p1">The line end point.</param>
/// <returns>True if line intersects with rectangle.</returns>
public static bool LineIntersectsWithRect(Rect2 rect, Point2 p0, Point2 p1)
{
double left = rect.Left;
double right = rect.Right;
double bottom = rect.Bottom;
double top = rect.Top;
double x0 = p0.X;
double y0 = p0.Y;
double x1 = p1.X;
double y1 = p1.Y;
double t0 = 0.0;
double t1 = 1.0;
double dx = x1 - x0;
double dy = y1 - y0;
double p = 0.0, q = 0.0, r;
for (int edge = 0; edge < 4; edge++)
{
if (edge == 0)
{
p = -dx;
q = -(left - x0);
}
if (edge == 1)
{
p = dx;
q = (right - x0);
}
if (edge == 2)
{
p = dy;
q = (bottom - y0);
}
if (edge == 3)
{
p = -dy;
q = -(top - y0);
}
r = q / p;
if (p == 0.0 && q < 0.0)
{
return(false);
}
if (p < 0.0)
{
if (r > t1)
{
return(false);
}
else if (r > t0)
{
t0 = r;
}
}
else if (p > 0.0)
{
if (r < t0)
{
return(false);
}
else if (r < t1)
{
t1 = r;
}
}
}
// Calculate clipped line position.
// x0clip = x0 + t0 * dx;
// y0clip = y0 + t0 * dy;
// x1clip = x0 + t1 * dx;
// y1clip = y0 + t1 * dy;
return(true);
}
private static void DrawEllipseInternal(Graphics gfx, Brush brush, Pen pen, bool isStroked, bool isFilled, ref Rect2 rect)
{
if (isFilled)
{
gfx.FillEllipse(
brush,
(float)rect.X,
(float)rect.Y,
(float)rect.Width,
(float)rect.Height);
}
if (isStroked)
{
gfx.DrawEllipse(
pen,
(float)rect.X,
(float)rect.Y,
(float)rect.Width,
(float)rect.Height);
}
}
private static PointF DrawLineArrowInternal(Graphics gfx, Pen pen, Brush brush, float x, float y, float angle, ArrowStyle style)
{
PointF pt;
var rt = new Matrix();
rt.RotateAt(angle, new PointF(x, y));
double rx = style.RadiusX;
double ry = style.RadiusY;
double sx = 2.0 * rx;
double sy = 2.0 * ry;
switch (style.ArrowType)
{
default:
case ArrowType.None:
{
pt = new PointF(x, y);
}
break;
case ArrowType.Rectangle:
{
var pts = new PointF[] { new PointF(x - (float)sx, y) };
rt.TransformPoints(pts);
pt = pts[0];
var rect = new Rect2(x - sx, y - ry, sx, sy);
var gs = gfx.Save();
gfx.MultiplyTransform(rt);
DrawRectangleInternal(gfx, brush, pen, style.IsStroked, style.IsFilled, ref rect);
gfx.Restore(gs);
}
break;
case ArrowType.Ellipse:
{
var pts = new PointF[] { new PointF(x - (float)sx, y) };
rt.TransformPoints(pts);
pt = pts[0];
var gs = gfx.Save();
gfx.MultiplyTransform(rt);
var rect = new Rect2(x - sx, y - ry, sx, sy);
DrawEllipseInternal(gfx, brush, pen, style.IsStroked, style.IsFilled, ref rect);
gfx.Restore(gs);
}
break;
case ArrowType.Arrow:
{
var pts = new PointF[]
{
new PointF(x, y),
new PointF(x - (float)sx, y + (float)sy),
new PointF(x, y),
new PointF(x - (float)sx, y - (float)sy),
new PointF(x, y)
};
rt.TransformPoints(pts);
pt = pts[0];
var p11 = pts[1];
var p21 = pts[2];
var p12 = pts[3];
var p22 = pts[4];
DrawLineInternal(gfx, pen, style.IsStroked, ref p11, ref p21);
DrawLineInternal(gfx, pen, style.IsStroked, ref p12, ref p22);
}
break;
}
return pt;
}
/// <summary>
///
/// </summary>
/// <param name="arc"></param>
/// <param name="rect"></param>
/// <param name="selected"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static bool HitTestArc(XArc arc, Rect2 rect, ISet<BaseShape> selected, double dx, double dy)
{
if (ShapeBounds.GetArcBounds(arc, dx, dy).IntersectsWith(rect))
{
if (selected != null)
{
selected.Add(arc);
return false;
}
else
{
return true;
}
}
return false;
}
/// <summary>
///
/// </summary>
/// <param name="text"></param>
/// <param name="rect"></param>
/// <param name="selected"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static bool HitTestText(XText text, Rect2 rect, ISet<BaseShape> selected, double dx, double dy)
{
if (ShapeBounds.GetTextBounds(text, dx, dy).IntersectsWith(rect))
{
if (selected != null)
{
selected.Add(text);
return false;
}
else
{
return true;
}
}
return false;
}
/// <summary>
/// Hit test rectangle if intersects with any of the shape bounds.
/// </summary>
/// <param name="shapes"></param>
/// <param name="rect"></param>
/// <param name="threshold"></param>
/// <returns></returns>
public static ImmutableHashSet<BaseShape> HitTest(IEnumerable<BaseShape> shapes, Rect2 rect, double threshold)
{
var selected = ImmutableHashSet.CreateBuilder<BaseShape>();
var selection = new Vector2[]
{
new Vector2(rect.X, rect.Y),
new Vector2(rect.X + rect.Width, rect.Y),
new Vector2(rect.X + rect.Width, rect.Y + rect.Height),
new Vector2(rect.X, rect.Y + rect.Height)
};
HitTest(shapes.Reverse(), rect, selection, selected, threshold, 0, 0);
return selected.ToImmutableHashSet();
}
/// <summary>
/// Hit test rectangle if intersects with any of the shape bounds.
/// </summary>
/// <param name="shapes"></param>
/// <param name="rect"></param>
/// <param name="selection"></param>
/// <param name="selected"></param>
/// <param name="threshold"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static bool HitTest(IEnumerable<BaseShape> shapes, Rect2 rect, Vector2[] selection, ISet<BaseShape> selected, double threshold, double dx, double dy)
{
foreach (var shape in shapes)
{
var result = HitTest(shape, rect, selection, selected, threshold, dx, dy);
if (result == true)
{
return true;
}
}
return false;
}
/// <summary>
/// Hit test rectangle if intersects with any of the shape bounds.
/// </summary>
/// <param name="shape"></param>
/// <param name="rect"></param>
/// <param name="selection"></param>
/// <param name="selected"></param>
/// <param name="threshold"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static bool HitTest(BaseShape shape, Rect2 rect, Vector2[] selection, ISet<BaseShape> selected, double threshold, double dx, double dy)
{
if (shape is XPoint)
{
return HitTestPoint(shape as XPoint, rect, selected, threshold, dx, dy);
}
else if (shape is XLine)
{
return HitTestLine(shape as XLine, rect, selected, threshold, dx, dy);
}
else if (shape is XEllipse)
{
return HitTestEllipse(shape as XEllipse, rect, selected, dx, dy);
}
else if (shape is XRectangle)
{
return HitTestRectangle(shape as XRectangle, rect, selected, dx, dy);
}
else if (shape is XArc)
{
return HitTestArc(shape as XArc, rect, selected, dx, dy);
}
else if (shape is XCubicBezier)
{
return HitTestCubicBezier(shape as XCubicBezier, selection, selected, dx, dy);
}
else if (shape is XQuadraticBezier)
{
return HitTestQadraticBezier(shape as XQuadraticBezier, selection, selected, dx, dy);
}
else if (shape is XText)
{
return HitTestText(shape as XText, rect, selected, dx, dy);
}
else if (shape is XImage)
{
return HitTestImage(shape as XImage, rect, selected, dx, dy);
}
else if (shape is XPath)
{
return HitTestPath(shape as XPath, selection, selected, dx, dy);
}
else if (shape is XGroup)
{
return HitTestGroup(shape as XGroup, rect, selection, selected, threshold, dx, dy);
}
return false;
}
/// <summary>
///
/// </summary>
/// <param name="group"></param>
/// <param name="rect"></param>
/// <param name="selection"></param>
/// <param name="selected"></param>
/// <param name="threshold"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static bool HitTestGroup(XGroup group, Rect2 rect, Vector2[] selection, ISet<BaseShape> selected, double threshold, double dx, double dy)
{
if (HitTest(group.Shapes.Reverse(), rect, selection, null, threshold, dx, dy) == true)
{
if (selected != null)
{
selected.Add(group);
return false;
}
else
{
return true;
}
}
return false;
}
/// <summary>
///
/// </summary>
/// <param name="image"></param>
/// <param name="rect"></param>
/// <param name="selected"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static bool HitTestImage(XImage image, Rect2 rect, ISet<BaseShape> selected, double dx, double dy)
{
if (ShapeBounds.GetImageBounds(image, dx, dy).IntersectsWith(rect))
{
if (selected != null)
{
selected.Add(image);
return false;
}
else
{
return true;
}
}
return false;
}
private void DrawBackgroundInternal(SKCanvas canvas, ArgbColor color, Rect2 rect)
{
using (SKPaint brush = ToSKPaintBrush(color))
{
SKRect srect = SKRect.Create(
_scaleToPage(rect.X),
_scaleToPage(rect.Y),
_scaleToPage(rect.Width),
_scaleToPage(rect.Height));
canvas.DrawRect(srect, brush);
}
}
/// <summary>
/// Creates a new <see cref="Rect2"/> instance.
/// </summary>
/// <param name="tl"></param>
/// <param name="br"></param>
/// <param name="dx"></param>
/// <param name="dy"></param>
/// <returns></returns>
public static Rect2 Create(XPoint tl, XPoint br, double dx = 0.0, double dy = 0.0)
{
return(Rect2.Create(tl.X, tl.Y, br.X, br.Y, dx, dy));
}