实现噪声函数

.gitignore

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+out/
+*.iml
+.idea/

src/top/dreamcenter/noise/Main.java

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+package top.dreamcenter.noise;
+
+import top.dreamcenter.noise.ui.NFrame;
+
+public class Main {
+    public static void main(String[] args) {
+        new NFrame();
+    }
+}

src/top/dreamcenter/noise/ui/NFrame.java

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+package top.dreamcenter.noise.ui;
+
+import javax.swing.*;
+import java.awt.*;
+
+public class NFrame extends JFrame {
+
+    public NFrame(){
+        setSize(600,626);
+        setTitle("perlin噪声算法");
+
+        setLayout(null);
+        setLocationRelativeTo(null);
+
+        NPanel nPanel = new NPanel();
+        nPanel.setLocation(45,45);
+
+        add(nPanel);
+        setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
+        setVisible(true);
+    }
+}

src/top/dreamcenter/noise/ui/NPanel.java

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+package top.dreamcenter.noise.ui;
+
+import top.dreamcenter.noise.util.Dot;
+
+import javax.swing.*;
+import java.awt.*;
+import java.util.ArrayList;
+
+/**
+ * 500 x 500 画布
+ * 10 x 10 采样点
+ */
+public class NPanel extends JPanel {
+
+    private static final int SCALE = 500;
+
+    public NPanel() {
+        setSize(SCALE,SCALE);
+
+
+        setVisible(true);
+    }
+
+
+    @Override
+    public void paint(Graphics g) {
+        // 绘制画板 OK
+        g.setColor(Color.white);
+        g.fillRect(0,0,500,500);
+
+
+        // 中心点位置 OK OR CHANGE -grid-
+        int cpt = SCALE>>1;
+        int grid = 50;
+
+
+        // 绘制辅助线 OK
+        g.setColor(Color.lightGray);
+        for (int i = 0; i < cpt / grid + 1; i++) {
+
+            // 水平
+            g.drawLine(0,cpt + grid * i,SCALE, cpt + grid * i);
+            g.drawLine(0,cpt - grid * i,SCALE, cpt - grid * i);
+            // 竖直
+            g.drawLine(cpt - grid * i,0, cpt - grid * i, SCALE);
+            g.drawLine(cpt + grid * i,0, cpt + grid * i, SCALE);
+        }
+
+        // 绘制坐标轴 OK
+        g.setColor(Color.gray);
+        g.fillRect(0, cpt-1,SCALE, 3);
+        g.fillRect(cpt - 1, 0,3, SCALE);
+
+
+        // 装饰
+        g.setColor(Color.BLUE);
+//        g.setFont(new Font("微软雅黑", Font.BOLD, 18));
+//        g.drawString("平滑函数F(x) = 6*x^5 - 15*x^4 - 10*x^3", 10, 100);
+//        g.drawString("噪声算法Noise(P) = Y1 + (Y2 - Y1)*F((xp-x1)/(delta_x))", 10, 150);
+
+
+        // 依据函数获取点矩阵 CHANGE!!
+        g.setColor(Color.RED);
+
+        Dot[] raw = new Dot[40]; // 原始采样点
+        for (int i = 0; i < raw.length; i++) {
+            Dot tmp = new Dot(i - 20, Math.random() * 2 * (Math.random() > 0.5 ? 1 : -1), cpt, grid);
+            tmp.toR();
+            raw[i] = tmp;
+        }
+
+        ArrayList<Dot.DotInt> dots = new ArrayList<>();
+        for (int i = 0; i < raw.length - 1; i++) {
+
+            // 插入原始点
+            dots.add(raw[i].toInt());
+
+            // 插值
+            Dot fi = raw[i].getV();
+            Dot se = raw[i + 1].getV();
+            
+            // 插值
+            for (int j = 1; j < grid; j++) {
+                double x = fi.x + j * 1.0 / grid;
+                Dot ist = new Dot(x, noise(fi, se, x), cpt, grid);
+                ist.toR();
+                ist.x = raw[i].x + j;
+
+                dots.add(ist.toInt());
+            }
+        }
+
+        // 绘制函数 OK
+        Dot.DotInt front = dots.get(0);
+        g.fillOval(front.x - 1, front.y - 1, 3,3);
+        for (int i = 1; i < dots.size(); i++) {
+            Dot.DotInt t = dots.get(i);
+//            g.fillOval(t.x - 1, t.y - 1, 3,3);
+//            g.drawLine(t.x - 1, t.y - 1, t.x - 1,cpt);
+            g.drawLine(front.x, front.y, t.x, t.y);
+            front = t;
+        }
+    }
+
+    private double noise(Dot fi, Dot se, double x){
+        return fi.y + (se.y - fi.y) * func((x - fi.x)/(se.x - fi.x));
+    }
+
+    private double func(double x) {
+        return 6 * Math.pow(x, 5) - 15 * Math.pow(x, 4) + 10 * Math.pow(x, 3);
+    }
+}

src/top/dreamcenter/noise/util/Dot.java

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+package top.dreamcenter.noise.util;
+
+public class Dot {
+    public double x;
+    public double y;
+    public int cpt;
+    public int grid;
+
+    public Dot(double x, double y, int cpt, int grid) {
+        this.x = x;
+        this.y = y;
+        this.cpt = cpt;
+        this.grid = grid;
+    }
+
+    /**
+     * 转为虚拟坐标
+     */
+    public void toV() {
+        x = (x - cpt) / grid;
+        y = (cpt - y) / grid;
+    }
+
+    public Dot getV() {
+        Dot tmp = new Dot(x, y , cpt, grid);
+        tmp.toV();
+        return tmp;
+    }
+
+    /**
+     * 转为实际坐标
+     */
+    public void toR () {
+
+        x = x * grid + cpt;
+        y = cpt - y * grid;
+    }
+
+    public Dot getR() {
+        Dot tmp = new Dot(x, y , cpt, grid);
+        tmp.toR();
+        return tmp;
+    }
+
+    public DotInt toInt(){
+        return new DotInt((int) x, (int) y);
+    }
+
+    public static class DotInt{
+        public int x;
+        public int y;
+
+        public DotInt(int x, int y) {
+            this.x = x;
+            this.y = y;
+        }
+    }
+}

src/top/dreamcenter/noise/util/Perlin.java

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+package top.dreamcenter.noise.util;
+
+public class Perlin {
+
+    public static void generatePerlin(int baseGrids) {
+        int width = baseGrids * 5;
+        double[][] map = new double[width][width];
+
+
+
+
+
+    }
+
+}