在jfreechart中绘制形状

Question

我正在使用Jfreechart绘制x-y轴我想在此x-y轴上绘制一个矩形和一个圆。你知道怎么可能吗？是否有更好的方法（而不是jfreechart）在其上绘制x-y轴及其形状？

Answer 1

我使用注释功能将圆形或其他项目绘制到XY图表图表​​上。要添加圆圈，请使用＆＃34; addAnnotation（XYShapeAnnotation（new Ellipse2D.Double（...）））＆＃34;例如。这是一个示例方法：

public void markChartAt2( float fromX, float fromY, float toX, float toY, markType markerTyp, Color lineColor, String toolTip ) {
    XYLineAnnotation lineAnnotation;
    XYShapeAnnotation shapeAnnotation;
    if (lineColor == null)
        lineColor = Color.black;
    maxY = yAxis.getUpperBound();
    minY = yAxis.getLowerBound();
    yFactor = (maxY - minY) * .005d;
    maxX = xAxis.getUpperBound();
    minX = xAxis.getLowerBound();
    xFactor = (maxX - minX) * .0005d;       
    switch ( markerTyp ){
    case CIRCLE:
        shapeAnnotation = new XYShapeAnnotation(
                new Ellipse2D.Double( fromX - xFactor, fromY - yFactor, xFactor+xFactor, yFactor+yFactor ),
                markerLineWidth, lineColor ) ;
        shapeAnnotation.setToolTipText( toolTip );
        priceXYPlot.addAnnotation(shapeAnnotation);
        break;
    case SQUARE:
        shapeAnnotation = new XYShapeAnnotation(
                new Rectangle2D.Double( fromX - xFactor, fromY - yFactor, xFactor+xFactor, yFactor+yFactor ),
                markerLineWidth, lineColor );
        shapeAnnotation.setToolTipText( toolTip );
        priceXYPlot.addAnnotation( shapeAnnotation );
        break;
    }
}