shading.dart
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/*
* Copyright (C) 2017, David PHAM-VAN <dev.nfet.net@gmail.com>
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
import 'package:meta/meta.dart';
import 'data_types.dart';
import 'document.dart';
import 'function.dart';
import 'object.dart';
import 'point.dart';
import 'rect.dart';
enum PdfShadingType { axial, radial }
class PdfShading extends PdfObject {
PdfShading(
PdfDocument pdfDocument, {
@required this.shadingType,
@required this.function,
@required this.start,
@required this.end,
this.radius0,
this.radius1,
this.boundingBox,
this.extendStart = false,
this.extendEnd = false,
}) : assert(shadingType != null),
assert(function != null),
assert(start != null),
assert(end != null),
assert(extendStart != null),
assert(extendEnd != null),
super(pdfDocument);
/// Name of the Shading object
String get name => '/S$objser';
final PdfShadingType shadingType;
final PdfBaseFunction function;
final PdfPoint start;
final PdfPoint end;
final PdfRect boundingBox;
final bool extendStart;
final bool extendEnd;
final double radius0;
final double radius1;
@override
void prepare() {
super.prepare();
params['/ShadingType'] = PdfNum(shadingType.index + 2);
if (boundingBox != null) {
params['/BBox'] = PdfArray.fromNum(<double>[
boundingBox.left,
boundingBox.bottom,
boundingBox.right,
boundingBox.top,
]);
}
params['/AntiAlias'] = const PdfBool(true);
params['/ColorSpace'] = const PdfName('/DeviceRGB');
if (shadingType == PdfShadingType.axial) {
params['/Coords'] =
PdfArray.fromNum(<double>[start.x, start.y, end.x, end.y]);
} else if (shadingType == PdfShadingType.radial) {
assert(radius0 != null);
assert(radius1 != null);
params['/Coords'] = PdfArray.fromNum(
<double>[start.x, start.y, radius0, end.x, end.y, radius1]);
}
// params['/Domain'] = PdfArray.fromNum(<num>[0, 1]);
if (extendStart || extendEnd) {
params['/Extend'] =
PdfArray(<PdfBool>[PdfBool(extendStart), PdfBool(extendEnd)]);
}
params['/Function'] = function.ref();
}
}