/// <summary>
/// Initializes the Scene and all Systems and Entities within it.
/// This may only ever be called once on a Scene.
/// </summary>
public void Initialize(SceneGeometry Geometry)
{
if (_IsInitialized)
{
throw new InvalidOperationException("Unable to initialize a Scene multiple times.");
}
_IsInitialized = true;
this._Geometry = Geometry;
foreach (var System in _Systems)
{
System.Initialize(this);
}
foreach (var Entity in _Entities)
{
Entity.Initialize(this);
}
}
private void DrawBullet(double x, double y, Canvas c, SceneGeometry sg)
{
Ellipse bullet = new Ellipse();
bullet.Height = 16;
bullet.Width = 16;
bullet.Fill = new SolidColorBrush(Color.FromRgb(246, 246, 233));
bullet.Stroke = new SolidColorBrush(Color.FromRgb(217, 83, 79));
bullet.StrokeThickness = 4;
double imx = sg.ToDisplayPixel(x);
double imy = sg.ToDisplayPixel(y);
double imy_fixed = sg.OutH - imy;
bullet.SetValue(Canvas.LeftProperty, imx - 8);
bullet.SetValue(Canvas.TopProperty, imy_fixed - 8);
bullet.SetValue(Canvas.ZIndexProperty, 1);
c.Children.Add(bullet);
}
public object LoadRegion(SceneGeometry sg)
{
var toShow = new List <object>();
var rect = new Rectangle(
sg.X,
sg.Y,
sg.X + sg.ToActualPixel(sg.W),
sg.Y + sg.ToActualPixel(sg.H)
);
foreach (var polygon in polygons)
{
Point p = polygon.head;
p.Info = polygon;
toShow.Add(p);
foreach (var edge in p.edges)
{
}
}
}
private void DrawOnThumb(Canvas c, SceneGeometry sg)
{
// 计算缩略图框的边界
double lft = sg.X / thumbDensity;
double top = sg.Y / thumbDensity;
double rgt = (sg.X + sg.ToActualPixel(sg.OutW)) / thumbDensity;
double btm = (sg.Y + sg.ToActualPixel(sg.OutH)) / thumbDensity;
//Console.WriteLine($"{lft:0.0}, {top:0.0}, {rgt:0.0}, {btm:0.0}");
double diameter = 12;
// 绘制缩略图框
if (rgt - lft >= diameter && btm - top >= diameter)
{
Rectangle rect = new Rectangle();
rect.SetValue(Canvas.LeftProperty, lft);
rect.SetValue(Canvas.TopProperty, top);
rect.Width = rgt - lft;
rect.Height = btm - top;
rect.Fill = new SolidColorBrush(Color.FromArgb(127, 127, 127, 127));
rect.Stroke = new SolidColorBrush(Color.FromRgb(217, 83, 79));
rect.StrokeThickness = 2;
c.Children.Add(rect);
}
else
{
Ellipse bullet = new Ellipse();
bullet.Height = diameter;
bullet.Width = diameter;
bullet.Fill = new SolidColorBrush(Color.FromArgb(127, 127, 127, 127));
bullet.Stroke = new SolidColorBrush(Color.FromRgb(217, 83, 79));
bullet.StrokeThickness = 2;
bullet.SetValue(Canvas.LeftProperty, (lft + rgt - diameter) / 2);
bullet.SetValue(Canvas.TopProperty, (top + btm - diameter) / 2);
c.Children.Add(bullet);
}
}
public Task <object> AsyncLoadRegion(SceneGeometry sg)
{
throw new NotImplementedException();
}
private void Work()
{
SceneGeometry sg0 = new SceneGeometry();
SceneGeometry sg1 = new SceneGeometry();
bool drew = false;
while (true)
{
long beg = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(); // 当前帧开始的时间
double dX = 0, dY = 0;
// 获取画面的几何信息, 保存thread local
var pendingActions = msgq.CheckOut();
if (pendingActions.Length == 0)
{
long end = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds();
long delta = end - beg;
int ms = (int)(period - delta);
Thread.Sleep(ms);
continue; // 注意不是执行剩余的循环体, 而是开始新的循环.
}
// 「打草稿」阶段
foreach (var act in pendingActions)
{
if (act is GeometryAction)
{
if (act is Move)
{
var a = act as Move;
dX += a.dX;
dY += a.dY;
}
else if (act is Zoom)
{
var a = act as Zoom;
sg1.Zoom(a.nScroll, a.X, a.Y);
}
else if (act is Resize)
{
var a = act as Resize;
sg1.Resize(a.W, a.H);
}
else if (act is ThumbJumpAction)
{
var a = act as ThumbJumpAction;
//double X = sg1.X, Y = sg1.Y;
sg1.X = a.CenterX * thumbDensity - sg1.ToActualPixel(sg1.OutW) / 2;
sg1.Y = a.CenterY * thumbDensity - sg1.ToActualPixel(sg1.OutH) / 2;
//Console.WriteLine($"From ({X:0.0},{Y:0.0}) -> ({sg1.X},{sg1.Y})");
}
}
else if (act is DrawingAction)
{
drew = true;
if (act is DrawPolygonV)
{
var a = act as DrawPolygonV;
if (a.dps == DrawPolygonState.PlacingVertex)
{
double x = sg1.X + sg1.ToActualPixel(a.X);
double y = sg1.Y + sg1.ToActualPixel(a.Y);
fg.AddPoint(a.Id, x, y);
}
else if (a.dps == DrawPolygonState.TryFinish)
{
double x = sg1.X + sg1.ToActualPixel(a.X);
double y = sg1.Y + sg1.ToActualPixel(a.Y);
fg.AddPoint(a.Id, x, y);
fg.MakePolygon(a.Id);
}
else if (a.dps == DrawPolygonState.ForceCancel)
{
fg.RemovePolygon(a.Id);
}
}
}
else if (act is FileAction)
{
if (act is LoadSlide)
{
var a = act as LoadSlide;
bg.Open(a.Path, sg1);
sg1.OutW = a.W;
sg1.OutH = a.H;
canvasThumb.Dispatcher.Invoke(() =>
{
using (var ms = new System.IO.MemoryStream(bg.LoadThumbJPG()))
{
var bi = new BitmapImage();
bi.BeginInit();
bi.CacheOption = BitmapCacheOption.OnLoad;
bi.StreamSource = ms;
bi.EndInit();
UniformToFill(sg1.SlideW, sg1.SlideH,
out double thumbW, out double thumbH);
(canvasThumb.Width, canvasThumb.Height) = (thumbW, thumbH);
canvasThumb.UpdateLayout();
imageThumb.ImageSource = bi;
//Console.WriteLine($"actualWH=({canvasThumb.ActualWidth},{canvasThumb.ActualHeight})");
}
}, System.Windows.Threading.DispatcherPriority.Send);
}
else if (act is CloseSlide)
{
fg.Close();
bg.Close();
}
}
}
sg1.Move(dX, dY);
// 只有画面的几何信息发生变化才合成新的帧.
if (sg1.GetHashCode() != sg0.GetHashCode() || drew)
//if (true)
{
// 先只做image layer的合成
// 做好了再做annotation layer
byte[] img = bg.LoadRegionBMP(sg1);
List <Drawable> items = fg.LoadRegionShapes(sg1);
imageMain.Dispatcher.Invoke(() =>
{
BitmapImage bi = null;
using (var ms = new System.IO.MemoryStream(img))
{
bi = new BitmapImage();
bi.BeginInit();
bi.CacheOption = BitmapCacheOption.OnLoad;
bi.StreamSource = ms;
bi.EndInit();
}
imageMain.ImageSource = bi;
}, System.Windows.Threading.DispatcherPriority.Send);
canvasMain.Dispatcher.Invoke(() =>
{
canvasMain.Children.Clear();
foreach (var item in items)
{
if (item is Point)
{
var p = item as Point;
DrawBullet(p.x, p.y, canvasMain, sg1);
}
else if (item is LineSegment)
{
var ls = item as LineSegment;
DrawLineSegment(ls.xa, ls.ya, ls.xb, ls.yb, canvasMain, sg1);
}
}
canvasMain.UpdateLayout();
}, System.Windows.Threading.DispatcherPriority.Send);
canvasThumb.Dispatcher.Invoke(() =>
{
canvasThumb.Children.Clear();
DrawOnThumb(canvasThumb, sg1);
});
sg0.CopyFrom(sg1);
drew = false;
}
// 如果end-beg小于period, 则忙等到period
for (long end = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds(); // 当前帧结束的时间
end - beg < period;
end = DateTimeOffset.UtcNow.ToUnixTimeMilliseconds())
{
Thread.Sleep(1); // 降低cpu占用率. 改善阅览体验.
}
}
}
private void DrawLineSegment(double x1, double y1, double x2, double y2, Canvas c, SceneGeometry sg)
{
Line l = new Line();
DrawBullet(x1, y1, c, sg);
DrawBullet(x2, y2, c, sg);
x1 = sg.ToDisplayPixel(x1);
y1 = sg.ToDisplayPixel(y1);
x2 = sg.ToDisplayPixel(x2);
y2 = sg.ToDisplayPixel(y2);
double y1_fixed = sg.OutH - y1;
double y2_fixed = sg.OutH - y2;
(l.X1, l.Y1, l.X2, l.Y2) = (x1, y1_fixed, x2, y2_fixed);
l.SetValue(Canvas.ZIndexProperty, 0);
l.StrokeThickness = 4;
l.Stroke = new SolidColorBrush(Color.FromRgb(51, 51, 51));
canvasMain.Children.Add(l);
}
