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<TD width=120 bgColor=#008cbb><FONT color=#f88000><B><A class=joy
href="http://www-900.ibm.com/developerWorks/cn/java/bbs/index.html">快樂
Java 大家談</A> </B></FONT></TD></TR></TBODY></TABLE>
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<TD align=middle bgColor=#ffffff><FONT
size=4><B>java繪圖功能的擴展</B></FONT></TD></TR>
<TR>
<TD bgColor=#ffffff>windgf
<P>設計applet有段時間了，正好這段時間在指導幾個本科生作大學物理網上實驗，網上實驗主要是applet圖形設計。</P>
<P>awt提供的繪圖功能很有限，比如說畫一個rect，它的邊只能是水平或垂直的，如果要畫一個具有一定角度的rect，就很不好實現，還有畫虛線等等。為了編程方便我們將這些功能都放在一個GraphicsBean中實現，實現applet繪圖功能的擴展。使用GraphicsBean時，只要申明一個GraphicsBean的實例即可。
</P>
<P>public class Applet1 extends Applet implements
ActionListener,AdjustmentListener <BR>{ <BR></P>
<BLOCKQUOTE>
<P>GraphicsBean my; <BR><BR>public void init() <BR>{
<BR> my=new GraphicsBean(); <BR>}
<BR><BR>public void update(Graphics g) <BR>{ <BR></P>
<BLOCKQUOTE>
<P>my.drawborder(g,size().width,size().height,4);
<BR>g.setColor(Color.black);
<BR>g.fillRect(x0-width/2,y0-height/2,width,height);
<BR>g.fillRect(x1-width/2,y1-height/2,width,height);
<BR>g.setColor(Color.blue);
<BR>g.drawRect(x0-width/2,y0-height/2,width,height);
<BR>g.drawRect(x1-width/2,y1-height/2,width,height);
<BR>g.setColor(Color.white);
<BR>my.drawArrow(g,x0-width/2+10,y0,x0+width/2-10,y0);
<BR>my.drawArrow(g,x0,y0+height/2-5,x0,y0-height/2+5);
<BR>my.drawArrow(g,x1-width/2+10,y1,x1+width/2-10,y1);
<BR>my.drawArrow(g,x1,y1+height/2-5,x1,y1-height/2+5);
<BR></P></BLOCKQUOTE>
<P>} <BR><BR>public void paint(Graphics g) <BR>{
<BR> update(g); <BR>} </P></BLOCKQUOTE>
<P>} <BR><BR>package myClass; <BR>import java.awt.*; <BR>public
class GraphicsBean { <BR></P>
<BLOCKQUOTE>
<P>double PI; <BR><BR>public void drawLine(Graphics g, int x0, int
y0, int x, int y, String str, Color color, Font font) { </P>
<BLOCKQUOTE>
<P>Color oldcolor = g.getColor(); <BR>Font oldfont =
g.getFont(); <BR>g.drawLine(x0, y0, x, y);
<BR>g.setColor(color); <BR>g.setFont(font); <BR>if(x > x0)
<BR>g.drawString(str, (x0 + x + 20) / 2, (y0 + y) / 2); <BR>else
<BR>g.drawString(str, ((x0 + x) - 20) / 2, (y0 + y) / 2);
<BR>g.setColor(oldcolor); <BR>g.setFont(oldfont);
</P></BLOCKQUOTE>
<P>} <BR><BR>public void drawAngleline(Graphics g, int x0, int y0,
int len, double angle) { <BR></P>
<BLOCKQUOTE>
<P>int x = x0 + (int)((double)len * Math.cos(angle)); <BR>int y
= y0 + (int)((double)len * Math.sin(angle)); <BR>g.drawLine(x0,
y0, x, y); </P></BLOCKQUOTE>
<P>} <BR><BR>public void drawArrow(Graphics g, int x0, int y0, int
x, int y) { <BR> Font font1 = new
Font("Dialog", 1, 15); <BR> drawArrow(g,
x0, y0, x, y, " ", Color.black, font1); <BR>} <BR><BR>public void
drawArrow(Graphics g, int x0, int y0, int x, int y, String str,
Color color, Font font) { <BR></P>
<BLOCKQUOTE>
<P>int s = 8; <BR>double a = PI / 12D; <BR>Color oldcolor =
g.getColor(); <BR>Font oldfont = g.getFont(); <BR>double angle =
angleOfline(x0, y0, x, y); <BR>g.drawLine(x0, y0, x, y);
<BR>if(angle <= PI / 2D) {
<BR> drawAngleline(g, x, y, s, (PI / 2D +
angle) - a); <BR> drawAngleline(g, x, y,
s, PI / 2D + angle + a); <BR>} else {
<BR> drawAngleline(g, x, y, s, angle - PI
/ 2D - a); <BR> drawAngleline(g, x, y, s,
(angle - PI / 2D) + a); <BR>} <BR>g.setColor(color);
<BR>g.setFont(font); <BR>if(x > x0) <BR>g.drawString(str, (x0
+ x + 20) / 2, (y0 + y) / 2); <BR>else <BR>g.drawString(str,
((x0 + x) - 20) / 2, (y0 + y) / 2); <BR>g.setColor(oldcolor);
<BR>g.setFont(oldfont); </P></BLOCKQUOTE>
<P>} <BR><BR>public void drawArrow(Graphics g, int x0, int y0, int
len, double angle) <BR>{ <BR> Font font1 =
new Font("Dialog", 1, 15);
<BR> drawArrow(g, x0, y0, len, angle, " ",
Color.black, font1); <BR>} <BR><BR>public void drawArrow(Graphics
g, int x0, int y0, int len, double angle,String str, Color color,
Font font) { <BR></P>
<BLOCKQUOTE>
<P>int s = 8; <BR>double a = PI / 12D; <BR>Color oldcolor =
g.getColor(); <BR>Font oldfont = g.getFont();
<BR>drawAngleline(g, x0, y0, len, angle); <BR>int x = x0 +
(int)((double)len * Math.cos(angle)); <BR>int y = y0 +
(int)((double)len * Math.sin(angle)); <BR>if(angle <= PI /
2D) { <BR></P>
<BLOCKQUOTE>
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