在jfreechart中繪製圖形

Question

我使用Jfreechart繪製x-y軸我想在這個x-y軸上繪製一個矩形和一個圓。你知道它怎麼可能？有沒有更好的方法（而不是jfreechart）繪製x-y軸及其形狀？

Answer 1

我使用註釋功能將圓形或其他項目繪製到XY圖表圖表​​上。例如，添加一個圓使用「addAnnotation（XYShapeAnnotation（new Ellipse2D.Double（...）））」。以下是一個示例方法：

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; 
    } 
}