雪花分形圖(遞迴演算法)
阿新 • • 發佈：2019-01-08
public class KochPanel extends JPanel {
private final int PANEL_WIDTH =400;
private final int PANEL_HEIGHT = 400;
private final double SQ = Math.sqrt(3.0)/6;
private final int TOPX = 200,TOPY = 20;
private final int LEFTX = 60,LEFTY = 300;
private final int RIGHTX = 340,RIGHTY = 300;
private int current;
public KochPanel(int currentOrder) {
current = currentOrder;
setBackground(Color.black);
setPreferredSize(new Dimension(PANEL_WIDTH,PANEL_HEIGHT));
}
public void drawFractal(int order,int x1,int y1,int x5,int y5,
Graphics page) {
int deltaX,deltaY,x2,y2,x3,y3,x4,y4;
if(order == 1)
page.drawLine(x1,y1,x5,y5);
else {
deltaX =x5 - x1;
deltaY =y5 - y1;
x2 = x1 + deltaX/3;
y2 = y1 + deltaY/3;
x3 = (int)((x1+x5)/2 + SQ*(y1-y5));
y3 = (int)((y1+y5)/2 + SQ*(x5-x1));
x4 = x1 + deltaX*2/3;
y4 = y1 + deltaY*2/3;
drawFractal(order-1,x1,y1,x2,y2,page);
drawFractal(order-1,x2,y2,x3,y3,page);
drawFractal(order-1,x3,y3,x4,y4,page);
drawFractal(order-1,x4,y4,x5,y5,page);
}
}
public void paintComponent(Graphics page) {
super.paintComponent(page);
page.setColor(Color.green);
drawFractal(current,TOPX,TOPY,LEFTX,LEFTY,page);
drawFractal(current,LEFTX,LEFTY,RIGHTX,RIGHTY,page);
drawFractal(current,RIGHTX,RIGHTY,TOPX,TOPY,page);
}
public void setOrder(int order) {
current = order;
}
public int getOrder() {
return current;
}
}
private final int PANEL_WIDTH =400;
private final int PANEL_HEIGHT = 400;
private final double SQ = Math.sqrt(3.0)/6;
private final int TOPX = 200,TOPY = 20;
private final int LEFTX = 60,LEFTY = 300;
private final int RIGHTX = 340,RIGHTY = 300;
private int current;
public KochPanel(int currentOrder) {
current = currentOrder;
setBackground(Color.black);
setPreferredSize(new Dimension(PANEL_WIDTH,PANEL_HEIGHT));
}
public void drawFractal(int order,int x1,int y1,int x5,int y5,
Graphics page) {
int deltaX,deltaY,x2,y2,x3,y3,x4,y4;
if(order == 1)
page.drawLine(x1,y1,x5,y5);
else {
deltaX =x5 - x1;
deltaY =y5 - y1;
x2 = x1 + deltaX/3;
y2 = y1 + deltaY/3;
x3 = (int)((x1+x5)/2 + SQ*(y1-y5));
y3 = (int)((y1+y5)/2 + SQ*(x5-x1));
x4 = x1 + deltaX*2/3;
y4 = y1 + deltaY*2/3;
drawFractal(order-1,x1,y1,x2,y2,page);
drawFractal(order-1,x2,y2,x3,y3,page);
drawFractal(order-1,x3,y3,x4,y4,page);
drawFractal(order-1,x4,y4,x5,y5,page);
}
}
public void paintComponent(Graphics page) {
super.paintComponent(page);
page.setColor(Color.green);
drawFractal(current,TOPX,TOPY,LEFTX,LEFTY,page);
drawFractal(current,LEFTX,LEFTY,RIGHTX,RIGHTY,page);
drawFractal(current,RIGHTX,RIGHTY,TOPX,TOPY,page);
}
public void setOrder(int order) {
current = order;
}
public int getOrder() {
return current;
}
}