public override void DrawImage(ITexture image, Rect rectangle, Point uvMin, Point uvMax)
{
if (image == null)
{
return;
}
EnsureContent();
unsafe
{
if (!this.content.ReadRecord(out DrawImageCommand record))
{//different record type: append new record
record.ImageSourceIndex = this.content.AddDependentResource(image);
record.rectangle = rectangle;
record.UVMin = uvMin;
record.UVMax = uvMax;
this.content.WriteRecord(RecordType.DrawImage, (byte *)&record, sizeof(DrawImageCommand));
return;
}
//same type: update record if different
bool recordNeedOverwrite = false;
if (this.content.ReadDependentResource(record.ImageSourceIndex, out ITexture oldImage))
{
if (!image.Equals(oldImage))
{
record.ImageSourceIndex = this.content.AddDependentResource(image);
recordNeedOverwrite = true;
}
}
else
{
record.ImageSourceIndex = this.content.AddDependentResource(image);
recordNeedOverwrite = true;
}
if (!Point.AlmostEqual(record.UVMin, uvMin))
{
record.UVMin = uvMin;
recordNeedOverwrite = true;
}
if (!Point.AlmostEqual(record.UVMax, uvMax))
{
record.UVMax = uvMax;
recordNeedOverwrite = true;
}
if (recordNeedOverwrite)
{
content.WriteRecord(RecordType.DrawImage, (byte *)&record, sizeof(DrawImageCommand));
}
}
}
public override void DrawLine(Pen pen, Point point0, Point point1)
{
if (pen == null)
{
throw new ArgumentNullException(nameof(pen));
}
unsafe
{
EnsureContent();
if (!this.content.ReadRecord(out DrawLineCommand record))
{//different record type: append new record
record.PenIndex = this.content.AddDependentResource(pen);
record.StartPoint = point0;
record.EndPoint = point1;
this.content.WriteRecord(RecordType.DrawLine, (byte *)&record, sizeof(DrawLineCommand));
return;
}
//same type: update record if different
bool recordNeedOverwrite = false;
if (!Point.AlmostEqual(record.StartPoint, point0))
{
record.StartPoint = point0;
recordNeedOverwrite = true;
}
if (!Point.AlmostEqual(record.EndPoint, point1))
{
record.EndPoint = point0;
recordNeedOverwrite = true;
}
if (this.content.ReadDependentResource(record.PenIndex, out Pen oldPen))
{
if (!Equals(oldPen, pen))
{
record.PenIndex = this.content.AddDependentResource(pen);
recordNeedOverwrite = true;
}
}
else
{
record.PenIndex = this.content.AddDependentResource(pen);
recordNeedOverwrite = true;
}
if (recordNeedOverwrite)
{
content.WriteRecord(RecordType.DrawLine, (byte *)&record, sizeof(DrawLineCommand));
}
}
}
public override void DrawEllipse(Brush brush, Pen pen, Point center, double radiusX, double radiusY)
{
if (brush == null && pen == null || radiusX <= 0 || radiusY <= 0)
{
return;
}
EnsureContent();
unsafe
{
if (!this.content.ReadRecord(out DrawEllipseCommand record))
{//different record type: append new record
record.BrushIndex = this.content.AddDependentResource(brush);
record.PenIndex = this.content.AddDependentResource(pen);
record.Center = center;
record.RadiusX = radiusX;
record.RadiusY = radiusY;
this.content.WriteRecord(RecordType.DrawEllipse, (byte *)&record, sizeof(DrawEllipseCommand));
return;
}
//same type: update record if different
bool recordNeedOverwrite = false;
if (!Point.AlmostEqual(record.Center, center))
{
record.Center = center;
recordNeedOverwrite = true;
}
if (!MathEx.AmostEqual(record.RadiusX, radiusX))
{
record.RadiusX = radiusX;
recordNeedOverwrite = true;
}
if (!MathEx.AmostEqual(record.RadiusY, radiusY))
{
record.RadiusY = radiusY;
recordNeedOverwrite = true;
}
if (this.content.ReadDependentResource(record.PenIndex, out Pen oldPen))
{
if (!oldPen.Equals(pen))
{
record.PenIndex = this.content.AddDependentResource(pen);
recordNeedOverwrite = true;
}
}
else
{
record.PenIndex = this.content.AddDependentResource(pen);
recordNeedOverwrite = true;
}
if (this.content.ReadDependentResource(record.BrushIndex, out Brush oldBrush))
{
if (!oldBrush.Equals(brush))
{
record.BrushIndex = this.content.AddDependentResource(brush);
recordNeedOverwrite = true;
}
}
else
{
record.BrushIndex = this.content.AddDependentResource(brush);
recordNeedOverwrite = true;
}
if (recordNeedOverwrite)
{
content.WriteRecord(RecordType.DrawEllipse, (byte *)&record, sizeof(DrawEllipseCommand));
}
}
}
public static bool AlmostEqual(this Point point, Point other)
{
return point.AlmostEqual(other.X, other.Y);
}
public static bool Contains(this Line line, Point point)
{
return(point.AlmostEqual(line.X1, line.Y1) || point.AlmostEqual(line.X2, line.Y2));
}
