BezierLineAndPointRenderer.java

/*
 * Copyright 2012 AndroidPlot.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.
 */

package com.androidplot.xy;

import android.graphics.Path;
import android.graphics.PointF;

/**
 * WARNING: This is an unfinished class.  Series drawn by this implementation may look nice
 * but they are not yet accurate representations of the control points from which they are derived.
 */
public class BezierLineAndPointRenderer extends LineAndPointRenderer<BezierLineAndPointFormatter> {
    public BezierLineAndPointRenderer(XYPlot plot) {
        super(plot);
    }

    @Override
    protected void appendToPath(Path path, PointF thisPoint, PointF lastPoint) {
        //path.lineTo(thisPoint.x, thisPoint.y);

        // bezier curve version:
        PointF mid = new PointF();
        mid.set((lastPoint.x + thisPoint.x) / 2, (lastPoint.y + thisPoint.y) / 2);
        path.quadTo((lastPoint.x + mid.x) / 2, lastPoint.y, mid.x, mid.y);
        //path.quadTo((mid.x + thisPoint.x) / 2, thisPoint.y, thisPoint.x, thisPoint.y);
        path.quadTo((mid.x + thisPoint.x) / 2, lastPoint.y, thisPoint.x, thisPoint.y);

    }
}