/// <summary>
/// Creates an <paramref name="affine"/> transform for DXF to PDF coordinate transformation and
/// a <paramref name="scale"/> transform for relative values like radii.
/// </summary>
/// <param name="viewPort">The DXF view port.</param>
/// <param name="options">The converter options.</param>
/// <param name="scale">[out] The (relative) scale transform.</param>
/// <param name="affine">[out] The (absolute) affine transform including scale.</param>
private static void CreateTransformations(DxfViewPort viewPort, DxfToPdfConverterOptions options,
out Matrix4 scale, out Matrix4 affine)
{
if (options.DxfSource != null && options.PdfDestination != null)
{
// user supplied source and destination rectangles, no trouble with units
var dxfSource = options.DxfSource.GetValueOrDefault();
double pdfOffsetX = options.PdfDestination.Left.AsPoints();
double pdfOffsetY = options.PdfDestination.Bottom.AsPoints();
double scaleX = options.PdfDestination.Width.AsPoints() / dxfSource.Width;
double scaleY = options.PdfDestination.Height.AsPoints() / dxfSource.Height;
double dxfOffsetX = dxfSource.Left;
double dxfOffsetY = dxfSource.Bottom;
scale = Matrix4.CreateScale(scaleX, scaleY, 0.0);
affine = Matrix4.CreateTranslate(+pdfOffsetX, +pdfOffsetY, 0.0)
* scale
* Matrix4.CreateTranslate(-dxfOffsetX, -dxfOffsetY, 0.0);
return;
}
// TODO this code assumes DXF unit inch - use actual unit from header instead!
// scale depends on the unit, output "pdf points" with 72 DPI
const double dotsPerInch = 72;
scale = Matrix4.CreateScale(options.Scale * dotsPerInch, options.Scale * dotsPerInch, 0.0);
affine = Matrix4.Identity
* scale
* Matrix4.CreateTranslate(-viewPort.LowerLeft.X, -viewPort.LowerLeft.Y, 0.0);
}
internal static DxfTable ReadFromBuffer(DxfCodePairBufferReader buffer)
{
var table = new DxfViewPortTable();
table.Items.Clear();
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
buffer.Advance();
if (DxfTablesSection.IsTableEnd(pair))
{
break;
}
if (pair.Code == 0 && pair.StringValue == DxfTable.ViewPortText)
{
var item = DxfViewPort.FromBuffer(buffer);
table.Items.Add(item);
}
}
return(table);
}
internal static DxfViewPort FromBuffer(DxfCodePairBufferReader buffer)
{
var item = new DxfViewPort();
while (buffer.ItemsRemain)
{
var pair = buffer.Peek();
if (pair.Code == 0)
{
break;
}
buffer.Advance();
switch (pair.Code)
{
case 70:
item.StandardFlags = (int)pair.ShortValue;
break;
case DxfCodePairGroup.GroupCodeNumber:
var groupName = DxfCodePairGroup.GetGroupName(pair.StringValue);
item.ExtensionDataGroups.Add(DxfCodePairGroup.FromBuffer(buffer, groupName));
break;
case 10:
item.LowerLeft.X = (pair.DoubleValue);
break;
case 20:
item.LowerLeft.Y = (pair.DoubleValue);
break;
case 11:
item.UpperRight.X = (pair.DoubleValue);
break;
case 21:
item.UpperRight.Y = (pair.DoubleValue);
break;
case 12:
item.ViewCenter.X = (pair.DoubleValue);
break;
case 22:
item.ViewCenter.Y = (pair.DoubleValue);
break;
case 13:
item.SnapBasePoint.X = (pair.DoubleValue);
break;
case 23:
item.SnapBasePoint.Y = (pair.DoubleValue);
break;
case 14:
item.SnapSpacing.X = (pair.DoubleValue);
break;
case 24:
item.SnapSpacing.Y = (pair.DoubleValue);
break;
case 15:
item.GridSpacing.X = (pair.DoubleValue);
break;
case 25:
item.GridSpacing.Y = (pair.DoubleValue);
break;
case 16:
item.ViewDirection.X = (pair.DoubleValue);
break;
case 26:
item.ViewDirection.Y = (pair.DoubleValue);
break;
case 36:
item.ViewDirection.Z = (pair.DoubleValue);
break;
case 17:
item.TargetViewPoint.X = (pair.DoubleValue);
break;
case 27:
item.TargetViewPoint.Y = (pair.DoubleValue);
break;
case 37:
item.TargetViewPoint.Z = (pair.DoubleValue);
break;
case 40:
item.ViewHeight = (pair.DoubleValue);
break;
case 41:
item.ViewPortAspectRatio = (pair.DoubleValue);
break;
case 42:
item.LensLength = (pair.DoubleValue);
break;
case 43:
item.FrontClippingPlane = (pair.DoubleValue);
break;
case 44:
item.BackClippingPlane = (pair.DoubleValue);
break;
case 45:
item.ViewHeight = (pair.DoubleValue);
break;
case 50:
item.SnapRotationAngle = (pair.DoubleValue);
break;
case 51:
item.ViewTwistAngle = (pair.DoubleValue);
break;
case 68:
item.Status = (pair.ShortValue);
break;
case 69:
item.ID = (pair.ShortValue);
break;
case 71:
item.ViewMode = (DxfViewMode)(pair.ShortValue);
break;
case 72:
item.CircleZoomPercent = (int)(pair.ShortValue);
break;
case 73:
item.FastZoom = BoolShort(pair.ShortValue);
break;
case 74:
item.UCSIcon = BoolShort(pair.ShortValue);
break;
case 75:
item.SnapOn = BoolShort(pair.ShortValue);
break;
case 76:
item.GridOn = BoolShort(pair.ShortValue);
break;
case 77:
item.SnapStyle = (pair.ShortValue);
break;
case 78:
item.SnapIsoPair = (pair.ShortValue);
break;
case 1:
item.PlotStyleSheet = (pair.StringValue);
break;
case 281:
item.RenderMode = (DxfViewRenderMode)(pair.ShortValue);
break;
case 65:
item.HasOwnUCS = BoolShort(pair.ShortValue);
break;
case 110:
item.UCSOrigin.X = (pair.DoubleValue);
break;
case 120:
item.UCSOrigin.Y = (pair.DoubleValue);
break;
case 130:
item.UCSOrigin.Z = (pair.DoubleValue);
break;
case 111:
item.UCSXAxis.X = (pair.DoubleValue);
break;
case 121:
item.UCSXAxis.Y = (pair.DoubleValue);
break;
case 131:
item.UCSXAxis.Z = (pair.DoubleValue);
break;
case 112:
item.UCSYAxis.X = (pair.DoubleValue);
break;
case 122:
item.UCSYAxis.Y = (pair.DoubleValue);
break;
case 132:
item.UCSYAxis.Z = (pair.DoubleValue);
break;
case 79:
item.OrthographicViewType = (DxfOrthographicViewType)(pair.ShortValue);
break;
case 146:
item.UCSElevation = (pair.DoubleValue);
break;
case 345:
item.UCSHandle = UIntHandle(pair.StringValue);
break;
case 346:
item.BaseUCSHandle = UIntHandle(pair.StringValue);
break;
case 170:
item.ShadePlotSetting = (DxfShadeEdgeMode)(pair.ShortValue);
break;
case 61:
item.MajorGridLines = BoolShort(pair.ShortValue);
break;
case 332:
item.BackgroundObjectPointer = UIntHandle(pair.StringValue);
break;
case 333:
item.ShadePlotObjectPointer = UIntHandle(pair.StringValue);
break;
case 348:
item.VisualStyleObjectPointer = UIntHandle(pair.StringValue);
break;
case 292:
item.IsDefaultLightingOn = (pair.BoolValue);
break;
case 282:
item.DefaultLightingType = (DxfDefaultLightingType)(pair.ShortValue);
break;
case 141:
item.Brightness = (pair.DoubleValue);
break;
case 142:
item.Contrast = (pair.DoubleValue);
break;
case 62:
item.AmbientColor = DxfColor.FromRawValue(pair.ShortValue);
break;
case 421:
item.AmbientColorInt = (pair.IntegerValue);
break;
case 431:
item.AmbientColorName = (pair.StringValue);
break;
case (int)DxfXDataType.ApplicationName:
item.XData = DxfXData.FromBuffer(buffer, pair.StringValue);
break;
default:
item.TrySetPair(pair);
break;
}
}
return item;
}
