Make the GUI graph fancier

paper-server/patches/sources/net/minecraft/server/gui/MinecraftServerGui.java.patch

@@ -1,10 +1,12 @@
 --- a/net/minecraft/server/gui/MinecraftServerGui.java
 +++ b/net/minecraft/server/gui/MinecraftServerGui.java
-@@ -96,7 +96,7 @@
+@@ -95,8 +95,8 @@
+ 
      private JComponent buildInfoPanel() {
          JPanel jpanel = new JPanel(new BorderLayout());
-         StatsComponent guistatscomponent = new StatsComponent(this.server);
+-        StatsComponent guistatscomponent = new StatsComponent(this.server);
 -        Collection collection = this.finalizers;
++        com.destroystokyo.paper.gui.GuiStatsComponent guistatscomponent = new com.destroystokyo.paper.gui.GuiStatsComponent(this.server); // Paper - Make GUI graph fancier
 +        Collection<Runnable> collection = this.finalizers; // CraftBukkit - decompile error
  
          Objects.requireNonNull(guistatscomponent);

paper-server/src/main/java/com/destroystokyo/paper/gui/GraphColor.java

@@ -0,0 +1,44 @@
+package com.destroystokyo.paper.gui;
+
+import java.awt.Color;
+
+public class GraphColor {
+    private static final Color[] colorLine = new Color[101];
+    private static final Color[] colorFill = new Color[101];
+
+    static {
+        for (int i = 0; i < 101; i++) {
+            Color color = createColor(i);
+            colorLine[i] = new Color(color.getRed() / 2, color.getGreen() / 2, color.getBlue() / 2, 255);
+            colorFill[i] = new Color(colorLine[i].getRed(), colorLine[i].getGreen(), colorLine[i].getBlue(), 125);
+        }
+    }
+
+    public static Color getLineColor(int percent) {
+        return colorLine[percent];
+    }
+
+    public static Color getFillColor(int percent) {
+        return colorFill[percent];
+    }
+
+    private static Color createColor(int percent) {
+        if (percent <= 50) {
+            return new Color(0X00FF00);
+        }
+
+        int value = 510 - (int) (Math.min(Math.max(0, ((percent - 50) / 50F)), 1) * 510);
+
+        int red, green;
+        if (value < 255) {
+            red = 255;
+            green = (int) (Math.sqrt(value) * 16);
+        } else {
+            green = 255;
+            value = value - 255;
+            red = 255 - (value * value / 255);
+        }
+
+        return new Color(red, green, 0);
+    }
+}

paper-server/src/main/java/com/destroystokyo/paper/gui/GraphData.java

@@ -0,0 +1,47 @@
+package com.destroystokyo.paper.gui;
+
+import java.awt.Color;
+
+public class GraphData {
+    private long total;
+    private long free;
+    private long max;
+    private long usedMem;
+    private int usedPercent;
+
+    public GraphData(long total, long free, long max) {
+        this.total = total;
+        this.free = free;
+        this.max = max;
+        this.usedMem = total - free;
+        this.usedPercent = usedMem == 0 ? 0 : (int) (usedMem * 100L / max);
+    }
+
+    public long getTotal() {
+        return total;
+    }
+
+    public long getFree() {
+        return free;
+    }
+
+    public long getMax() {
+        return max;
+    }
+
+    public long getUsedMem() {
+        return usedMem;
+    }
+
+    public int getUsedPercent() {
+        return usedPercent;
+    }
+
+    public Color getFillColor() {
+        return GraphColor.getFillColor(usedPercent);
+    }
+
+    public Color getLineColor() {
+        return GraphColor.getLineColor(usedPercent);
+    }
+}

paper-server/src/main/java/com/destroystokyo/paper/gui/GuiStatsComponent.java

@@ -0,0 +1,41 @@
+package com.destroystokyo.paper.gui;
+
+import net.minecraft.server.MinecraftServer;
+
+import javax.swing.JPanel;
+import javax.swing.Timer;
+import java.awt.BorderLayout;
+import java.awt.Dimension;
+
+public class GuiStatsComponent extends JPanel {
+    private final Timer timer;
+    private final RAMGraph ramGraph;
+
+    public GuiStatsComponent(MinecraftServer server) {
+        super(new BorderLayout());
+
+        setOpaque(false);
+
+        ramGraph = new RAMGraph();
+        RAMDetails ramDetails = new RAMDetails(server);
+
+        add(ramGraph, "North");
+        add(ramDetails, "Center");
+
+        timer = new Timer(500, (event) -> {
+            ramGraph.update();
+            ramDetails.update();
+        });
+        timer.start();
+    }
+
+    @Override
+    public Dimension getPreferredSize() {
+        return new Dimension(350, 200);
+    }
+
+    public void close() {
+        timer.stop();
+        ramGraph.stop();
+    }
+}

paper-server/src/main/java/com/destroystokyo/paper/gui/RAMDetails.java

@@ -0,0 +1,74 @@
+package com.destroystokyo.paper.gui;
+
+import net.minecraft.Util;
+import net.minecraft.server.MinecraftServer;
+import net.minecraft.util.TimeUtil;
+
+import javax.swing.DefaultListCellRenderer;
+import javax.swing.DefaultListSelectionModel;
+import javax.swing.JList;
+import javax.swing.border.EmptyBorder;
+import java.awt.Dimension;
+import java.text.DecimalFormat;
+import java.text.DecimalFormatSymbols;
+import java.util.Locale;
+import java.util.Vector;
+
+public class RAMDetails extends JList<String> {
+    public static final DecimalFormat DECIMAL_FORMAT = Util.make(new DecimalFormat("########0.000"), (format)
+        -> format.setDecimalFormatSymbols(DecimalFormatSymbols.getInstance(Locale.ROOT)));
+
+    private final MinecraftServer server;
+
+    public RAMDetails(MinecraftServer server) {
+        this.server = server;
+
+        setBorder(new EmptyBorder(0, 10, 0, 0));
+        setFixedCellHeight(20);
+        setOpaque(false);
+
+        DefaultListCellRenderer renderer = new DefaultListCellRenderer();
+        renderer.setOpaque(false);
+        setCellRenderer(renderer);
+
+        setSelectionModel(new DefaultListSelectionModel() {
+            @Override
+            public void setAnchorSelectionIndex(final int anchorIndex) {
+            }
+
+            @Override
+            public void setLeadAnchorNotificationEnabled(final boolean flag) {
+            }
+
+            @Override
+            public void setLeadSelectionIndex(final int leadIndex) {
+            }
+
+            @Override
+            public void setSelectionInterval(final int index0, final int index1) {
+            }
+        });
+    }
+
+    @Override
+    public Dimension getPreferredSize() {
+        return new Dimension(350, 100);
+    }
+
+    public void update() {
+        GraphData data = RAMGraph.DATA.peekLast();
+        Vector<String> vector = new Vector<>();
+        vector.add("Memory use: " + (data.getUsedMem() / 1024L / 1024L) + " mb (" + (data.getFree() * 100L / data.getMax()) + "% free)");
+        vector.add("Heap: " + (data.getTotal() / 1024L / 1024L) + " / " + (data.getMax() / 1024L / 1024L) + " mb");
+        vector.add("Avg tick: " + DECIMAL_FORMAT.format((double)this.server.getAverageTickTimeNanos() / (double) TimeUtil.NANOSECONDS_PER_MILLISECOND) + " ms");
+        setListData(vector);
+    }
+
+    public double getAverage(long[] tickTimes) {
+        long total = 0L;
+        for (long value : tickTimes) {
+            total += value * 1000;
+        }
+        return ((double) total / (double) tickTimes.length) * 1.0E-6D;
+    }
+}

paper-server/src/main/java/com/destroystokyo/paper/gui/RAMGraph.java

@@ -0,0 +1,156 @@
+package com.destroystokyo.paper.gui;
+
+import javax.swing.JComponent;
+import javax.swing.SwingUtilities;
+import javax.swing.Timer;
+import javax.swing.ToolTipManager;
+import java.awt.Color;
+import java.awt.Dimension;
+import java.awt.Graphics;
+import java.awt.MouseInfo;
+import java.awt.Point;
+import java.awt.PointerInfo;
+import java.awt.event.MouseAdapter;
+import java.awt.event.MouseEvent;
+import java.text.SimpleDateFormat;
+import java.util.Date;
+import java.util.LinkedList;
+import java.util.concurrent.TimeUnit;
+
+public class RAMGraph extends JComponent {
+    public static final LinkedList<GraphData> DATA = new LinkedList<GraphData>() {
+        @Override
+        public boolean add(GraphData data) {
+            if (size() >= 348) {
+                remove();
+            }
+            return super.add(data);
+        }
+    };
+
+    static {
+        GraphData empty = new GraphData(0, 0, 0);
+        for (int i = 0; i < 350; i++) {
+            DATA.add(empty);
+        }
+    }
+
+    private final Timer timer;
+    private final SimpleDateFormat TIME_FORMAT = new SimpleDateFormat("HH:mm:ss");
+
+    private int currentTick;
+
+    public RAMGraph() {
+        ToolTipManager.sharedInstance().setInitialDelay(0);
+
+        addMouseListener(new MouseAdapter() {
+            final int defaultDismissTimeout = ToolTipManager.sharedInstance().getDismissDelay();
+            final int dismissDelayMinutes = (int) TimeUnit.MINUTES.toMillis(10);
+
+            @Override
+            public void mouseEntered(MouseEvent me) {
+                ToolTipManager.sharedInstance().setDismissDelay(dismissDelayMinutes);
+            }
+
+            @Override
+            public void mouseExited(MouseEvent me) {
+                ToolTipManager.sharedInstance().setDismissDelay(defaultDismissTimeout);
+            }
+        });
+
+        timer = new Timer(50, (event) -> repaint());
+        timer.start();
+    }
+
+    @Override
+    public Dimension getPreferredSize() {
+        return new Dimension(350, 110);
+    }
+
+    public void update() {
+        Runtime jvm = Runtime.getRuntime();
+        DATA.add(new GraphData(jvm.totalMemory(), jvm.freeMemory(), jvm.maxMemory()));
+
+        PointerInfo pointerInfo = null;
+        // I think I recall spotting a bug report where this throwed an exception once
+        // not sure it's of concern here
+        try {
+            pointerInfo = MouseInfo.getPointerInfo();
+        } catch (NullPointerException | ArrayIndexOutOfBoundsException ignored) {
+            // https://bugs.openjdk.org/browse/JDK-6840067
+        }
+        if (pointerInfo != null) {
+            Point point = pointerInfo.getLocation();
+            if (point != null) {
+                Point loc = new Point(point);
+                SwingUtilities.convertPointFromScreen(loc, this);
+                if (this.contains(loc)) {
+                    ToolTipManager.sharedInstance().mouseMoved(
+                        new MouseEvent(this, -1, System.currentTimeMillis(), 0, loc.x, loc.y,
+                            point.x, point.y, 0, false, 0));
+                }
+            }
+        }
+
+        currentTick++;
+    }
+
+    @Override
+    public void paint(Graphics graphics) {
+        graphics.setColor(new Color(0xFFFFFFFF));
+        graphics.fillRect(0, 0, 350, 100);
+
+        graphics.setColor(new Color(0x888888));
+        graphics.drawLine(1, 25, 348, 25);
+        graphics.drawLine(1, 50, 348, 50);
+        graphics.drawLine(1, 75, 348, 75);
+
+        int i = 0;
+        for (GraphData data : DATA) {
+            i++;
+            if ((i + currentTick) % 120 == 0) {
+                graphics.setColor(new Color(0x888888));
+                graphics.drawLine(i, 1, i, 99);
+            }
+            int used = data.getUsedPercent();
+            if (used > 0) {
+                Color color = data.getLineColor();
+                graphics.setColor(data.getFillColor());
+                graphics.fillRect(i, 100 - used, 1, used);
+                graphics.setColor(color);
+                graphics.fillRect(i, 100 - used, 1, 1);
+            }
+        }
+
+        graphics.setColor(new Color(0xFF000000));
+        graphics.drawRect(0, 0, 348, 100);
+
+        Point m = null;
+        try {
+            m = getMousePosition();
+        } catch (NullPointerException ignored) {
+            // https://bugs.openjdk.org/browse/JDK-6840067
+        }
+        if (m != null && m.x > 0 && m.x < 348 && m.y > 0 && m.y < 100) {
+            GraphData data = DATA.get(m.x);
+            int used = data.getUsedPercent();
+            graphics.setColor(new Color(0x000000));
+            graphics.drawLine(m.x, 1, m.x, 99);
+            graphics.drawOval(m.x - 2, 100 - used - 2, 5, 5);
+            graphics.setColor(data.getLineColor());
+            graphics.fillOval(m.x - 2, 100 - used - 2, 5, 5);
+            setToolTipText(String.format("<html><body>Used: %s mb (%s%%)<br/>%s</body></html>",
+                Math.round(data.getUsedMem() / 1024F / 1024F),
+                used, getTime(m.x)));
+        }
+    }
+
+    public String getTime(int halfSeconds) {
+        int millis = (348 - halfSeconds) / 2 * 1000;
+        return TIME_FORMAT.format(new Date((System.currentTimeMillis() - millis)));
+    }
+
+    public void stop() {
+        timer.stop();
+    }
+}