我在下面编写代码来绘制像照片一样的分形树。但我在第二次递归方法中遇到问题。 (用于中间分支长度控制)。我如何改进和纠正它?
我的代码:
import java.awt.BasicStroke;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.JFrame;
public class FractalTree1 extends Canvas {
// fields for drawing
private final JFrame frame;
private final int WINDOW_WIDTH = 1280;
private final int WINDOW_HEIGHT = 720;
public FractalTree1() {
frame = new JFrame("Fractal Tree");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
frame.setLocationRelativeTo(null);
frame.setResizable(true);
Component add = frame.add(this);
frame.setVisible(true);
}
public static void main(String[] args) {
FractalTree1 ft = new FractalTree1();
ft.setVisible(true);
ft.setBackground(Color.black);
}
@Override
public void paint(Graphics g) {
g.setColor(Color.green);
drawFractalTree(g, WINDOW_WIDTH / 2, WINDOW_HEIGHT - 75, -90, 2, true);
}
public void drawFractalTree(Graphics g, int x1, int y1, double angle, int depth, boolean value) {
if (depth == 0) {
} else {
int x2, y2;
if (value) {
x2 = x1 + (int) (Math.cos(Math.toRadians(angle)) * depth * 100.0);
y2 = y1 + (int) (Math.sin(Math.toRadians(angle)) * depth * 100.0);
} else {
x2 = (int) ((x1 + (int) (Math.cos(Math.toRadians(angle)) * depth * 100.0)) * 0.3);
y2 = (int) (y1 + (int) (Math.sin(Math.toRadians(angle)) * depth * 100.0) * 0.3);
}
Graphics2D g2d = (Graphics2D) g;
g2d.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g2d.setStroke(new BasicStroke(0.5f * depth));
g2d.drawLine(x1, y1, x2, y2);
drawFractalTree(g, x2, y2, angle + 10, depth - 1, true);
drawFractalTree(g, x2, y2, angle - 35, depth - 1, false);
drawFractalTree(g, x2, y2, angle - 70, depth - 1, true);
}
}
}
我的目标照片: my target photo
我更新了代码:
import java.awt.BasicStroke;
import java.awt.Canvas;
import java.awt.Color;
import java.awt.Component;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.RenderingHints;
import javax.swing.JFrame;
public class FractalTree1 extends Canvas {
// fields for drawing
private final JFrame frame;
private final int WINDOW_WIDTH = 1280;
private final int WINDOW_HEIGHT = 720;
public FractalTree1() {
frame = new JFrame("Fractal Tree");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.setSize(WINDOW_WIDTH, WINDOW_HEIGHT);
frame.setLocationRelativeTo(null);
frame.setResizable(true);
Component add = frame.add(this);
frame.setVisible(true);
}
public static void main(String[] args) {
FractalTree1 ft = new FractalTree1();
ft.setVisible(true);
ft.setBackground(Color.black);
}
@Override
public void paint(Graphics g) {
g.setColor(Color.green);
drawFractalTree((Graphics2D) g, WINDOW_WIDTH / 2, WINDOW_HEIGHT - 75, -90, 3,100, 1.0);
}
public void drawFractalTree(Graphics2D g, int x1, int y1, double angle, int depth, double size, double factor) {
if (depth > 0) {
int x2 = x1 + (int) (Math.cos(Math.toRadians(angle)) * depth * size * factor);
int y2 = y1 + (int) (Math.sin(Math.toRadians(angle)) * depth * size * factor);
g.setStroke(new BasicStroke(0.5f * depth));
g.drawLine(x1, y1, x2, y2);
drawFractalTree(g, x2, y2, angle + 10, depth - 1, size, 1.0);
drawFractalTree(g, x2, y2, angle - 35, depth - 1, size, 0.3);
drawFractalTree(g, x2, y2, angle - 70, depth - 1, size, 1.0);
} }}
我在此Photo Link中显示我的新结果: new
但是第二个分支长度是worng。我可以像我的第一张照片(目标链接)那样纠正它
答案 0 :(得分:5)
else
案例中的计算错误:
y2 = ...
行0.3
应用于分支机构的端点,而不是它的长度试试这个:
} else {
x2 = x1 + (int) (Math.cos(Math.toRadians(angle)) * depth * 100.0 * 0.3);
y2 = y1 + (int) (Math.sin(Math.toRadians(angle)) * depth * 100.0 * 0.3);
}
但是我需要对不同尺寸和角度参数进行更微调。
此外,您可以通过提供更多参数并将antialias设置移出方法来简化您的方法:
public void drawFractalTree(Graphics2D g, int x1, int y1, double angle, int depth, double size, double factor) {
if (depth > 0) {
int x2 = x1 + (int) (Math.cos(Math.toRadians(angle)) * depth * size * factor);
int y2 = y1 + (int) (Math.sin(Math.toRadians(angle)) * depth * size * factor);
g.setStroke(new BasicStroke(0.5f * depth));
g.drawLine(x1, y1, x2, y2);
drawFractalTree(g, x2, y2, angle + 10, depth - 1, size, 1.0);
drawFractalTree(g, x2, y2, angle - 35, depth - 1, size, 0.3);
drawFractalTree(g, x2, y2, angle - 70, depth - 1, size, 1.0);
}
}