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Graph.java
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Graph.java
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package me.despawningbone.discordbot.command.info;
import java.awt.Color;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.EmptyStackException;
import java.util.List;
import org.knowm.xchart.BitmapEncoder;
import org.knowm.xchart.XYChart;
import org.knowm.xchart.XYChartBuilder;
import org.knowm.xchart.BitmapEncoder.BitmapFormat;
import org.knowm.xchart.XYSeries.XYSeriesRenderStyle;
import me.despawningbone.discordbot.command.Command;
import me.despawningbone.discordbot.command.CommandResult;
import me.despawningbone.discordbot.command.CommandResult.CommandResultType;
import net.dv8tion.jda.api.entities.Message;
import net.dv8tion.jda.api.entities.channel.concrete.TextChannel;
import net.dv8tion.jda.api.utils.FileUpload;
import net.dv8tion.jda.api.entities.User;
import net.objecthunter.exp4j.Expression;
import net.objecthunter.exp4j.ExpressionBuilder;
import net.objecthunter.exp4j.function.Function;
public class Graph extends Command {
public Graph() {
this.desc = "Plot a graph with a mathematical equation!";
this.usage = "<eqn>";
this.remarks = Arrays.asList("Please use \"x\" for the variables.");
this.isDisabled = true;
this.examples = Arrays.asList("1+x/(x+100)");
}
Function logb = new Function("logx", 2) {
@Override
public double apply(double... args) {
return Math.log(args[1]) / Math.log(args[0]);
}
};
@Override
public CommandResult execute(TextChannel channel, User author, Message msg, String[] args) {
double low = -10; double high = 10; boolean hasRange = false;
if(args[0].contains("..")) {
try {
String[] range = args[0].split("\\.\\.");
low = Double.parseDouble(range[0]);
high = Double.parseDouble(range[1]);
if(low < -200 || high > 200) {
return new CommandResult(CommandResultType.INVALIDARGS, "Range specified is too large.");
}
hasRange = true;
} catch (ArrayIndexOutOfBoundsException e) {
e.printStackTrace(); //should never trigger
} catch (IllegalStateException e) {
if(!e.getMessage().equals("No match found")) { //= not include range
e.printStackTrace();
}
} catch (NumberFormatException e) {
return new CommandResult(CommandResultType.INVALIDARGS, "Invalid range.");
}
}
if(hasRange) args[0] = "";
String eqn = String.join(" ", args);
XYChart chart = new XYChartBuilder().width(800).height(600).title("Graph for " + eqn).build();
chart.getStyler().setDefaultSeriesRenderStyle(XYSeriesRenderStyle.Line);
chart.getStyler().setLegendVisible(false);
chart.getStyler().setPlotContentSize(0.91);
chart.getStyler().setMarkerSize(0);
//chart.getStyler().setAxisTitlePadding(24);
chart.getStyler().setChartTitlePadding(12);
chart.getStyler().setChartPadding(12);
chart.getStyler().setChartBackgroundColor(new Color(200, 220, 230));
List<Double> xSeries = new ArrayList<>();
List<Double> ySeries = new ArrayList<>();
try {
Expression e = new ExpressionBuilder(eqn).function(logb).variables("x").build();
for(double i = low; i <= high; i+=0.01) { //tan graphs looks wrong
if(i != 0) {
double val = e.setVariable("x", i).evaluate();
if(val == Double.POSITIVE_INFINITY) {
val = 1e100;
} else if(val == Double.NEGATIVE_INFINITY) {
val = 1e-100;
}
if(/*val > low && val < high &&*/ !Double.isNaN(val) && val != Double.POSITIVE_INFINITY && val != Double.NEGATIVE_INFINITY) {
ySeries.add(val);
xSeries.add(i);
}
}
}
chart.addSeries("data", xSeries, ySeries);
// String ans = format.format(e.evaluate());
} catch (EmptyStackException e1) {
return new CommandResult(CommandResultType.INVALIDARGS, "You have imbalanced parentheses.");
} catch (ArithmeticException e1) {
return new CommandResult(CommandResultType.INVALIDARGS, "You cannot divide by zero.");
} catch (IllegalArgumentException e1) {
return new CommandResult(CommandResultType.FAILURE, "An error has occured: " + e1.getMessage());
}
ByteArrayOutputStream os = new ByteArrayOutputStream();
try {
BitmapEncoder.saveBitmap(chart, os, BitmapFormat.PNG);
} catch (IOException e1) {
e1.printStackTrace();
}
channel.sendFiles(FileUpload.fromData(os.toByteArray(), "graph.png")).queue();
return new CommandResult(CommandResultType.SUCCESS);
}
}

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Expires
Sun, Aug 3, 4:07 AM (49 m, 7 s)
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Storage Format
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Storage Handle
28/95/a9619a9a5fca56e36dae00d3082e

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