好玩的分形绘制
public void draw1(int x1, int y1, int x2, int y2,int depth) {//科赫曲线g.drawLine(x1, y1, x2, y2);if (depth<=1)return;else {//得到三等分点double x11 = (x1 * 2 + x2) / 3;double y11 = (y1 * 2 + y2) / 3;double x22 = (x1 + x2 * 2) / 3;double y22 = (y1 + y2 * 2) / 3;double x33 = (x11 + x22) / 2 - (y11 - y22) * Math.sqrt(3) / 2;double y33 = (y11 + y22) / 2 - (x22 - x11) * Math.sqrt(3) / 2;g.setColor(j.getBackground());g.drawLine((int) x1, (int) y1, (int) x2, (int) y2);g.setColor(Color.black);draw1((int) x1, (int) y1, (int) x11, (int) y11,depth-1);draw1((int) x11, (int) y11, (int) x33, (int) y33,depth-1);draw1((int) x22, (int) y22, (int) x2, (int) y2,depth-1);draw1((int) x33, (int) y33, (int) x22, (int) y22,depth-1);}}?正方形：public void draw2(int x1, int y1, int m,int depth) {//正方形g.fillRect(x1, y1, m, m);m = m / 3;if (depth<=1)return;else{double x11 = x1 - 2 * m;double y11 = y1 - 2 * m;double x22 = x1 + m;double y22 = y1 - 2 * m;double x33 = x1 + 4 * m;double y33 = y1 - 2 * m;double x44 = x1 - 2 * m;double y44 = y1 + m;double x55 = x1 + 4 * m;double y55 = y1 + m;double x66 = x1 - 2 * m;double y66 = y1 + 4 * m;double x77 = x1 + m;double y77 = y1 + 4 * m;double x88 = x1 + 4 * m;double y88 = y1 + 4 * m;draw2((int) x11, (int) y11, (int) m,depth-1);draw2((int) x22, (int) y22, (int) m,depth-1);draw2((int) x33, (int) y33, (int) m,depth-1);draw2((int) x44, (int) y44, (int) m,depth-1);draw2((int) x55, (int) y55, (int) m,depth-1);draw2((int) x66, (int) y66, (int) m,depth-1);draw2((int) x77, (int) y77, (int) m,depth-1);draw2((int) x88, (int) y88, (int) m,depth-1);}}?public void draw3(int x1,int y1,int x2,int y2,int x3,int y3,int depth){//三角形double s = Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));g.drawLine(x1,y1,x2,y2);g.drawLine(x2,y2,x3,y3);g.drawLine(x1,y1,x3,y3);//if(s<3)//return;if (depth<=1)return;else{/* * 上面的三角形 */double x11=(x1*3+x2)/4;double y11=y1-(s/4)*Math.sqrt(3);double x12=(x1+x2*3)/4;double y12=y11;double x13=(x1+x2)/2;double y13=y1;/* * 左边的三角形 */double x21=x1-s/4;double y21=(y1+y3)/2;double x22=x1+s/4;double y22=y21;double x23=x1;double y23=y3;/* * 右边的三角形 */double x31=x2+s/4;double y31=(y1+y3)/2;double x32=x2-s/4;double y32=y21;double x33=x2;double y33=y3;draw3((int)x11,(int)y11,(int)x12,(int)y12, (int)x13, (int)y13, depth-1);draw3((int)x21,(int)y21,(int)x22,(int)y22, (int)x23, (int)y23, depth-1);draw3((int)x31,(int)y31,(int)x32,(int)y32, (int)x33, (int)y33, depth-1);}}?
1、任意画一个正三角形，并把每一边三等分；2、取三等分后的一边中间一段为边向外作正三角形，并把这“中间一段”擦掉；3、重复上述两步，画出更小的三角形。4、一直重复，直到无穷，所画出的曲线叫做科赫曲线。?小结：分形是个很好玩的东西，根据自己的奇妙想象可以画出很多很好看的图形，不仅仅是已经存在的，你可以创造出属于你自己的图形！
