private void Update(float updatePeriod)
{
float angle = -updatePeriod * 0.6f;
stick = RotateLine(stick, angle);
var minX = Math.Min(stick.Item1.X, stick.Item2.X);
var maxX = Math.Max(stick.Item1.X, stick.Item2.X);
var minY = Math.Min(stick.Item1.Y, stick.Item2.Y);
var maxY = Math.Max(stick.Item1.Y, stick.Item2.Y);
stickAABB = Box2dExtensions.CreateFromMinMax(minX, minY, maxX, maxY);
}
/// <summary>
/// Transforms elements coordinates relative to given canvas system into [0,1]² with y-axis heading upwards
/// </summary>
/// <param name="element">Input UIElement to transform relative to canvas</param>
/// <param name="canvas">Input canvas for realative transformation</param>
public static Box2D ConvertBounds(this UIElement element, Canvas canvas)
{
var p00 = new Point(0, 0);
var p11 = p00 + (Vector)element.RenderSize;
var leftTop = (Vector)element.TranslatePoint(p00, canvas);
var rightBottom = (Vector)element.TranslatePoint(p11, canvas);
//flip y coordinate
return(Box2dExtensions.CreateFromMinMax(
(float)leftTop.X, (float)(canvas.ActualHeight - rightBottom.Y),
(float)rightBottom.X, (float)(canvas.ActualHeight - leftTop.Y)));
}
private void Render()
{
GL.Clear(ClearBufferMask.ColorBufferBit);
GL.Color3(Color.CornflowerBlue);
DrawLine(stick);
GL.Color3(Color.YellowGreen);
DrawAABB(stickAABB);
GL.Color3(Color.Black);
DrawAABB(Box2dExtensions.CreateFromCenterSize(0, 0, 0.02f, 0.02f));
}
private MyVisual()
{
//setup
texBird = TextureLoader.FromBitmap(Resourcen.bird1);
//background clear color
GL.ClearColor(Color.White);
//for transparency in textures
GL.BlendFunc(BlendingFactorSrc.SrcAlpha, BlendingFactorDest.OneMinusSrcAlpha);
GL.Enable(EnableCap.Blend); // for transparency in textures
//generate birds
for (float delta = .1f; delta < .5f; delta += .1f)
{
birds.Add(Box2dExtensions.CreateFromCenterSize(rotCenter.X - delta, rotCenter.Y - delta, .1f, .1f));
birds.Add(Box2dExtensions.CreateFromCenterSize(rotCenter.X - delta, rotCenter.Y + delta, .1f, .1f));
birds.Add(Box2dExtensions.CreateFromCenterSize(rotCenter.X + delta, rotCenter.Y - delta, .1f, .1f));
birds.Add(Box2dExtensions.CreateFromCenterSize(rotCenter.X + delta, rotCenter.Y + delta, .1f, .1f));
}
}
