如何定义graphics2D.drawLine()方法画出来的直线的粗细？

Question

先初始化一个Font对象，然后调用setFont方法。

Answer 1

setFont给本就没用。他只对drawString()方法有用。
————————————————————————————
setStroke()怎么用？

Answer 2

public void  drawRelLine(int aiType,int aiThick,Point aoP1,Point aoP2)
           throws ExceptionReporter
    {
        if ( aiThick < 0 )
        {
            throw new ExceptionReporter("慄偺懢偝傪巜掕偟傑偡","0埲忋傪巜掕偟傑偡");
        }        //昞帵偡傞懢偝偺寁嶼
        float pflineW = (float)( 2 * ( aiThick / 2 ) + 1 );        Graphics2D dw_Line = (Graphics2D)pgraphics;        //REL_LINE1
        if ( aiType == REL_LINE1 )
        {
            float[] DW_REL_LINE2 = {5f,0f};
            BasicStroke dashed = new BasicStroke(pflineW,
                                               BasicStroke.CAP_BUTT,
                                               BasicStroke.JOIN_MITER,
                                               1.0f,
                                               DW_REL_LINE2,
                                               1.0f);
            dw_Line.setStroke(dashed);
            dw_Line.draw(new Line2D.Double(
                                              aoP1.getX() , aoP1.getY(),
                                              aoP2.getX() , aoP2.getY()
                                          ));
        }        //REL_LINE2
        if ( aiType == REL_LINE2 )
        {
            float[] DW_REL_LINE2 = {5f,5f};
            BasicStroke dashed = new BasicStroke(pflineW,
                                               BasicStroke.CAP_BUTT,
                                               BasicStroke.JOIN_MITER,
                                               1.0f,
                                               DW_REL_LINE2,
                                               1.0f);
            dw_Line.setStroke(dashed);
            dw_Line.draw(new Line2D.Double(
                                              aoP1.getX() , aoP1.getY(),
                                              aoP2.getX() , aoP2.getY()
                                          ));
        }        //REL_LINE3
        if ( aiType == REL_LINE3 )
        {
            float[] DW_REL_LINE3 = {10f,5f,5f,5f};
            BasicStroke dashed = new BasicStroke(pflineW,
                                               BasicStroke.CAP_BUTT,
                                               BasicStroke.JOIN_MITER,
                                               1.0f,
                                               DW_REL_LINE3,
                                               1.0f);
            dw_Line.setStroke(dashed);
            dw_Line.draw(new Line2D.Double(
                                              aoP1.getX() , aoP1.getY(),
                                              aoP2.getX() , aoP2.getY()
                                          ));
        }        //REL_LINE4
        if ( aiType == REL_LINE4 )
        {
            float[] DW_REL_LINE4 = {10f,3f,3f,3f,3f,3f};
            BasicStroke dashed = new BasicStroke(pflineW,
                                               BasicStroke.CAP_BUTT,
                                               BasicStroke.JOIN_MITER,
                                               1.0f,
                                               DW_REL_LINE4,
                                               1.0f);
            dw_Line.setStroke(dashed);
            dw_Line.draw(new Line2D.Double(
                                              aoP1.getX() , aoP1.getY(),
                                              aoP2.getX() , aoP2.getY()
                                          ));
        }
    }