simple desktop 3d graphics

Author: jafu888

desktop/graph3d/.idea/.gitignore

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+package com.support.constraintlayout.extlib.graph3d;
+
+import javax.swing.*;
+import java.awt.*;
+import java.awt.event.ComponentAdapter;
+import java.awt.event.ComponentEvent;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.awt.image.BufferedImage;
+import java.awt.image.DataBufferInt;
+
+
+public class Graph3dPanel extends JPanel {
+
+    SurfaceGen mSurfaceGen = new SurfaceGen();
+    private BufferedImage mImage;
+    private int[] mImageBuff;
+    int mGraphType = 2;
+    private float mLastTouchX0 = Float.NaN;
+    private float mLastTouchY0;
+    private float mLastTrackBallX;
+    private float mLastTrackBallY;
+    double mDownScreenWidth;
+
+    public Graph3dPanel() {
+
+        mSurfaceGen.calcSurface(-20, 20, -20, 20, true, (x, y) -> {
+            double d = Math.sqrt(x * x + y * y);
+            return 10 * ((d == 0) ? 1f : (float) (Math.sin(d) / d));
+        });
+
+        addComponentListener(new ComponentAdapter() {
+            @Override
+            public void componentResized(ComponentEvent e) {
+                onSizeChanged(e);
+            }
+
+        });
+        MouseAdapter mouseAdapter = new MouseAdapter() {
+            @Override
+            public void mouseReleased(MouseEvent e) {
+                onMouseUP(e);
+            }
+
+            @Override
+            public void mousePressed(MouseEvent e) {
+                onMouseDown(e);
+            }
+
+            @Override
+            public void mouseDragged(MouseEvent e) {
+                onMouseDrag(e);
+            }
+        };
+        addMouseListener(mouseAdapter);
+        addMouseMotionListener(mouseAdapter);
+    }
+
+    public void onSizeChanged(ComponentEvent c) {
+        int width = getWidth();
+        int height = getHeight();
+
+        if (width == 0 || height == 0) {
+            return;
+        }
+        mImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
+        mImageBuff = ((DataBufferInt) (mImage.getRaster().getDataBuffer())).getData();
+        mSurfaceGen.setScreenDim(width, height, mImageBuff, 0x00FFFFFF);
+    }
+
+    public void onMouseDown(MouseEvent ev) {
+        mDownScreenWidth = mSurfaceGen.getScreenWidth();
+        mLastTouchX0 = ev.getX();
+        mLastTouchY0 = ev.getY();
+        mSurfaceGen.trackBallDown(mLastTouchX0, mLastTouchY0);
+        mLastTrackBallX = mLastTouchX0;
+        mLastTrackBallY = mLastTouchY0;
+    }
+
+    public void onMouseDrag(MouseEvent ev) {
+        if (Float.isNaN(mLastTouchX0)) {
+            return;
+        }
+        float tx = ev.getX();
+        float ty = ev.getY();
+        float moveX = (mLastTrackBallX - tx);
+        float moveY = (mLastTrackBallY - ty);
+        if (moveX * moveX + moveY * moveY < 4000f) {
+            mSurfaceGen.trackBallMove(tx, ty);
+        }
+        mLastTrackBallX = tx;
+        mLastTrackBallY = ty;
+        repaint();
+    }
+
+    public void onMouseUP(MouseEvent ev) {
+        mLastTouchX0 = Float.NaN;
+        mLastTouchY0 = Float.NaN;
+    }
+
+    public void paintComponent(Graphics g) {
+        int w = getWidth();
+        int h = getHeight();
+        if (mSurfaceGen.notSetUp()) {
+            System.out.println("setup");
+            mSurfaceGen.setUpMatrix(w, h);
+        }
+
+        mSurfaceGen.render(mGraphType);
+        if (mImage == null) {
+            return;
+        }
+        g.drawImage(mImage, 0, 0, null);
+    }
+
+
+}

desktop/graph3d/.idea/uiDesigner.xml

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+package com.support.constraintlayout.extlib.graph3d;
+
+import javax.swing.*;
+
+public class Main {
+    public static void main(String[] args) {
+        JFrame frame =  new JFrame("3d Plot");
+        Graph3dPanel  p = new Graph3dPanel();
+        frame.setContentPane(p);
+        frame.setBounds(100,100,500,500);
+        frame.setVisible(true);
+        frame.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
+
+    }
+}