/// <summary>
/// Visits all crossings of the current edge with all edges of the given index
/// cell of B. Terminates early and returns false if visitor_ returns false.
/// </summary>
private bool VisitEdgeCellCrossings(ShapeEdge a, S2ShapeIndexCell b_cell)
{
// Test the current edge of A against all edges of "b_cell".
// Note that we need to use a new S2EdgeCrosser (or call Init) whenever we
// replace the contents of b_shape_edges_, since S2EdgeCrosser requires that
// its S2Point arguments point to values that persist between Init() calls.
GetShapeEdges(b_index_, b_cell, b_shape_edges_);
var crosser = new S2EdgeCrosser(a.V0, a.V1);
foreach (var b in b_shape_edges_)
{
if (crosser.C == S2Point.Empty || crosser.C != b.V0)
{
crosser.RestartAt(b.V0);
}
int sign = crosser.CrossingSign(b.V1);
if (sign >= min_crossing_sign_)
{
if (!VisitEdgePair(a, b, sign == 1))
{
return(false);
}
}
}
return(true);
}
private bool VisitEdgePair(ShapeEdge a, ShapeEdge b, bool is_interior)
{
if (swapped_)
{
return(visitor_(b, a, is_interior));
}
else
{
return(visitor_(a, b, is_interior));
}
}
private void OnShapeEdgeMouseDown(object sender, MouseButtonEventArgs e)
{
System.Windows.Shapes.Shape edgeShape = (System.Windows.Shapes.Shape)sender;
this.controlledEdgeIndex = this.edgeShapeToEdgeIndex[edgeShape];
ShapeEdge edge = this.shape.Structure.Edges[this.controlledEdgeIndex.Value];
this.initialEdgeWidth = this.shape.EdgeWidths[this.controlledEdgeIndex.Value];
Point mousePos = e.GetPosition(this.shapeCanvas);
this.initialDistanceFromEdgeLine = new Vector(mousePos.X, mousePos.Y).DistanceToLine(
this.shape.VertexPositions[edge.Index1], this.shape.VertexPositions[edge.Index2]);
}
private Transform CalcEdgeTransform(int edgeIndex)
{
ShapeEdge edge = this.shape.Structure.Edges[edgeIndex];
Vector pos1 = this.shape.VertexPositions[edge.Index1];
Vector pos2 = this.shape.VertexPositions[edge.Index2];
Vector middlePos = 0.5 * (pos1 + pos2);
double edgeLength = pos1.DistanceToPoint(pos2);
double angle = Vector.AngleBetween(Vector.UnitX, pos2 - pos1);
TransformGroup result = new TransformGroup();
result.Children.Add(new TranslateTransform(-0.5, -0.5));
result.Children.Add(new ScaleTransform(edgeLength, this.shape.EdgeWidths[edgeIndex]));
result.Children.Add(new RotateTransform(MathHelper.ToDegrees(angle)));
result.Children.Add(new TranslateTransform(middlePos.X, middlePos.Y));
return(result);
}
private void OnShapeCanvasMouseMove(object sender, MouseEventArgs e)
{
Point mousePos = e.GetPosition(this.shapeCanvas);
if (this.controlledVertexIndex.HasValue)
{
this.shape.VertexPositions[this.controlledVertexIndex.Value] = new Vector(mousePos.X, mousePos.Y) - this.mouseOffset;
}
else if (this.controlledEdgeIndex.HasValue)
{
ShapeEdge edge = this.shape.Structure.Edges[this.controlledEdgeIndex.Value];
double distanceFromEdgeLine = new Vector(mousePos.X, mousePos.Y).DistanceToLine(
this.shape.VertexPositions[edge.Index1], this.shape.VertexPositions[edge.Index2]);
this.shape.EdgeWidths[this.controlledEdgeIndex.Value] =
Math.Max(this.initialEdgeWidth + 2 * (distanceFromEdgeLine - this.initialDistanceFromEdgeLine), 5);
}
if (this.controlledVertexIndex.HasValue || this.controlledEdgeIndex.HasValue)
{
this.UpdateShapeControls();
}
}
private Image DrawConstraintsOnTopOfImage(
Image backgroundImage, float drawSizeRatio, ShapeConstraints shapeConstraints, bool drawVertexConstraints, bool drawMinEdgeWidth, bool drawMaxEdgeWidth, bool drawAverageEdgeWidth)
{
const float pointRadius = 4;
const float lineWidth = 2;
Bitmap statusImage = new Bitmap((int)(backgroundImage.Width * drawSizeRatio), (int)(backgroundImage.Height * drawSizeRatio));
using (Graphics graphics = Graphics.FromImage(statusImage))
{
graphics.DrawImage(backgroundImage, 0, 0, statusImage.Width, statusImage.Height);
if (drawVertexConstraints)
{
foreach (VertexConstraints vertexConstraint in shapeConstraints.VertexConstraints)
{
graphics.DrawRectangle(
new Pen(Color.Orange, lineWidth),
(float)vertexConstraint.MinCoord.X * drawSizeRatio,
(float)vertexConstraint.MinCoord.Y * drawSizeRatio,
(float)(vertexConstraint.MaxCoord.X - vertexConstraint.MinCoord.X) * drawSizeRatio,
(float)(vertexConstraint.MaxCoord.Y - vertexConstraint.MinCoord.Y) * drawSizeRatio);
}
}
foreach (VertexConstraints vertexConstraint in shapeConstraints.VertexConstraints)
{
graphics.FillEllipse(
Brushes.Black,
(float)vertexConstraint.MiddleCoord.X * drawSizeRatio - pointRadius,
(float)vertexConstraint.MiddleCoord.Y * drawSizeRatio - pointRadius,
2 * pointRadius,
2 * pointRadius);
}
for (int i = 0; i < shapeConstraints.ShapeStructure.Edges.Count; ++i)
{
ShapeEdge edge = shapeConstraints.ShapeStructure.Edges[i];
Vector point1 = shapeConstraints.VertexConstraints[edge.Index1].MiddleCoord * drawSizeRatio;
Vector point2 = shapeConstraints.VertexConstraints[edge.Index2].MiddleCoord * drawSizeRatio;
graphics.DrawLine(new Pen(Color.Black, lineWidth), MathHelper.VecToPointF(point1), MathHelper.VecToPointF(point2));
if (drawMinEdgeWidth || drawMaxEdgeWidth || drawAverageEdgeWidth)
{
EdgeConstraints edgeConstraint = shapeConstraints.EdgeConstraints[i];
Vector diff = point2 - point1;
Vector edgeNormal = (new Vector(diff.Y, -diff.X)).GetNormalized();
if (drawMaxEdgeWidth)
{
DrawOrientedRectange(graphics, point1, point2, edgeNormal, (float)edgeConstraint.MaxWidth * drawSizeRatio, new Pen(Color.Cyan, lineWidth));
}
if (drawMinEdgeWidth)
{
DrawOrientedRectange(graphics, point1, point2, edgeNormal, (float)edgeConstraint.MinWidth * drawSizeRatio, new Pen(Color.Red, lineWidth));
}
if (drawAverageEdgeWidth)
{
DrawOrientedRectange(graphics, point1, point2, edgeNormal, (float)(edgeConstraint.MinWidth + edgeConstraint.MaxWidth) * drawSizeRatio * 0.5f, new Pen(Color.Blue, lineWidth));
}
}
}
}
return(statusImage);
}