/*
* Copyright 2009 Hao Nguyen
*
* 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.
*/
package gwt.g2d.client.graphics.visitor;
import com.google.gwt.canvas.dom.client.Context2d;
import gwt.g2d.client.graphics.Surface;
import gwt.g2d.shared.math.Vector2;
/**
* Adds the end point to the current path, connected to the starting point by a
* cubic Bezier curve with the given control points.
* The new position will be set to the given end point.
*
* @author hao1300@gmail.com
*/
public class BezierCurveVisitor implements ShapeVisitor {
private final double startPointX, startPointY, controlPoint1X, controlPoint1Y,
controlPoint2X, controlPoint2Y, endPointX, endPointY;
/**
* Adds a curve that connects the point (startPointX, startPointY) to the
* point (endPointX, endPointY), using the control points
* (controlPoint1X, controlPoint1Y) and (controlPoint2X, controlPoint2Y).
*/
public BezierCurveVisitor(double startPointX, double startPointY,
double controlPoint1X, double controlPoint1Y,
double controlPoint2X, double controlPoint2Y,
double endPointX, double endPointY) {
this.startPointX = startPointX;
this.startPointY = startPointY;
this.controlPoint1X = controlPoint1X;
this.controlPoint1Y = controlPoint1Y;
this.controlPoint2X = controlPoint2X;
this.controlPoint2Y = controlPoint2Y;
this.endPointX = endPointX;
this.endPointY = endPointY;
}
/**
* Adds a curve that connects the startPoint to the endPoint, using the
* control points controlPoint1 and controlPoint2.
*/
public BezierCurveVisitor(Vector2 startPoint, Vector2 controlPoint1,
Vector2 controlPoint2, Vector2 endPoint) {
this(startPoint.getX(), startPoint.getY(),
controlPoint1.getX(), controlPoint1.getY(),
controlPoint2.getX(), controlPoint2.getY(),
endPoint.getX(), endPoint.getY());
}
public void visit(Surface surface) {
Context2d context = surface.getContext();
context.moveTo(startPointX, startPointY);
context.bezierCurveTo(controlPoint1X, controlPoint1Y,
controlPoint2X, controlPoint2Y,
endPointX, endPointY);
}
}