e657. 用直线和曲线绘制图形

 GeneralPath shape = new GeneralPath();
    shape.moveTo(x, y);
    shape.lineTo(x, y);
    shape.quadTo(controlPointX, controlPointY, x, y);
    shape.curveTo(controlPointX1, controlPointY1, controlPointX2, controlPointY2, x, y);
    shape.closePath();
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