public Shape CreateCircleApprox(float length, int edges)
{
MinMax <float> angleRange = new MinMax <float>(0.3f, 1.5f);
edges = Math.Max(edges, 3);
float[] angles = new float[edges];
//use random angles
angles = BuildCircleApproxAngles(edges, angleRange);
//create lines
List <LineSegment> lines = new List <LineSegment>();
Point2D lastPoint = SwinGame.PointAt(0, 0);
float totalAngle = 0;
foreach (float angle in angles)
{
totalAngle += angle;
Vector vec = SwinGame.VectorFromAngle(totalAngle, length);
lines.Add(SwinGame.CreateLine(lastPoint, lastPoint + vec));
lastPoint = lines.Last().EndPoint;
}
lines.Add(SwinGame.CreateLine(lastPoint, SwinGame.PointAt(0, 0)));
//bounding box
List <LineSegment> boundingBox = CreateBoundingBox(lines);
Shape shape = new Shape(lines, boundingBox, SwinGame.PointAt(0, 0));
return(shape);
}
private void AddBoxes(List <LineSegment> shape, JArray boxesObj, int lineLength)
{
if (boxesObj == null)
{
return;
}
List <Point2D> boxes = boxesObj.ToObject <List <Point2D> >();
foreach (Point2D p in boxes)
{
Point2D[] corners = BoxCorners(p, lineLength);
shape.Add(SwinGame.CreateLine(corners[0], corners[1]));
shape.Add(SwinGame.CreateLine(corners[1], corners[2]));
shape.Add(SwinGame.CreateLine(corners[2], corners[3]));
shape.Add(SwinGame.CreateLine(corners[3], corners[0]));
}
}
private void AddTriangles(List <LineSegment> shape, JArray trianglesObj, int lineLength)
{
if (trianglesObj == null)
{
return;
}
List <Point2D> triangles = trianglesObj.ToObject <List <Point2D> >();
foreach (Point2D p in triangles)
{
Point2D[] corners = BoxCorners(p, lineLength);
LineSegment bottom = SwinGame.CreateLine(corners[3], corners[2]);
LineSegment left = SwinGame.CreateLine(corners[2], SwinGame.LineMidPoint(SwinGame.CreateLine(corners[0], corners[1])));
LineSegment right = SwinGame.CreateLine(corners[3], SwinGame.LineMidPoint(SwinGame.CreateLine(corners[0], corners[1])));
shape.Add(bottom);
shape.Add(left);
shape.Add(right);
}
}
//build bounding box for collision mask
private List <LineSegment> CreateBoundingBox(List <LineSegment> lines)
{
float xMin = 0, xMax = 0, yMin = 0, yMax = 0;
foreach (LineSegment l in lines)
{
FindFromPoint2D(l.StartPoint);
FindFromPoint2D(l.EndPoint);
}
void FindFromPoint2D(Point2D linePos)
{
if (linePos.X < xMin)
{
xMin = linePos.X;
}
if (linePos.X > xMax)
{
xMax = linePos.X;
}
if (linePos.Y < yMin)
{
yMin = linePos.Y;
}
if (linePos.Y > yMax)
{
yMax = linePos.Y;
}
}
return(new List <LineSegment>()
{
SwinGame.CreateLine(xMin, yMin, xMax, yMin),
SwinGame.CreateLine(xMax, yMin, xMax, yMax),
SwinGame.CreateLine(xMax, yMax, xMin, yMax),
SwinGame.CreateLine(xMin, yMax, xMin, yMin)
});
}
//////////////////////
// drawing linesegment
//////////////////////
public static void Draw(this LineSegment l, Color clr, Point2D offset)
{
LineSegment result = SwinGame.CreateLine(l.StartPoint.Add(offset), l.EndPoint.Add(offset));
SwinGame.DrawLine(clr, result);
}
/// <summary>
/// Multiply point by an int
/// </summary>
public static LineSegment Multiply(this LineSegment l, int x)
{
return(SwinGame.CreateLine(l.StartPoint.Multiply(x), l.EndPoint.Multiply(x)));
}