CartesianPlot.java
import javafx.application.Application; import javafx.beans.binding.Bindings; import javafx.geometry.*; import javafx.scene.Scene; import javafx.scene.chart.NumberAxis; import javafx.scene.layout.*; import javafx.scene.paint.Color; import javafx.scene.shape.*; import javafx.stage.Stage; import java.util.function.Function; // Java 8 code public class CartesianPlot extends Application { public static void main(String[] args) { launch(args); } @Override public void start(final Stage stage) { Axes axes = new Axes( 400, 300, -8, 8, 1, -6, 6, 1 ); Plot plot = new Plot( x -> .25 * (x + 4) * (x + 1) * (x - 2), -8, 8, 0.1, axes ); StackPane layout = new StackPane( plot ); layout.setPadding(new Insets(20)); layout.setStyle("-fx-background-color: rgb(35, 39, 50);"); stage.setTitle("y = \u00BC(x+4)(x+1)(x-2)"); stage.setScene(new Scene(layout, Color.rgb(35, 39, 50))); stage.show(); } class Axes extends Pane { private NumberAxis xAxis; private NumberAxis yAxis; public Axes( int width, int height, double xLow, double xHi, double xTickUnit, double yLow, double yHi, double yTickUnit ) { setMinSize(Pane.USE_PREF_SIZE, Pane.USE_PREF_SIZE); setPrefSize(width, height); setMaxSize(Pane.USE_PREF_SIZE, Pane.USE_PREF_SIZE); xAxis = new NumberAxis(xLow, xHi, xTickUnit); xAxis.setSide(Side.BOTTOM); xAxis.setMinorTickVisible(false); xAxis.setPrefWidth(width); xAxis.setLayoutY(height / 2); yAxis = new NumberAxis(yLow, yHi, yTickUnit); yAxis.setSide(Side.LEFT); yAxis.setMinorTickVisible(false); yAxis.setPrefHeight(height); yAxis.layoutXProperty().bind( Bindings.subtract( (width / 2) + 1, yAxis.widthProperty() ) ); getChildren().setAll(xAxis, yAxis); } public NumberAxis getXAxis() { return xAxis; } public NumberAxis getYAxis() { return yAxis; } } class Plot extends Pane { public Plot( Function<Double, Double> f, double xMin, double xMax, double xInc, Axes axes ) { Path path = new Path(); path.setStroke(Color.ORANGE.deriveColor(0, 1, 1, 0.6)); path.setStrokeWidth(2); path.setClip( new Rectangle( 0, 0, axes.getPrefWidth(), axes.getPrefHeight() ) ); double x = xMin; double y = f.apply(x); path.getElements().add( new MoveTo( mapX(x, axes), mapY(y, axes) ) ); x += xInc; while (x < xMax) { y = f.apply(x); path.getElements().add( new LineTo( mapX(x, axes), mapY(y, axes) ) ); x += xInc; } setMinSize(Pane.USE_PREF_SIZE, Pane.USE_PREF_SIZE); setPrefSize(axes.getPrefWidth(), axes.getPrefHeight()); setMaxSize(Pane.USE_PREF_SIZE, Pane.USE_PREF_SIZE); getChildren().setAll(axes, path); } private double mapX(double x, Axes axes) { double tx = axes.getPrefWidth() / 2; double sx = axes.getPrefWidth() / (axes.getXAxis().getUpperBound() - axes.getXAxis().getLowerBound()); return x * sx + tx; } private double mapY(double y, Axes axes) { double ty = axes.getPrefHeight() / 2; double sy = axes.getPrefHeight() / (axes.getYAxis().getUpperBound() - axes.getYAxis().getLowerBound()); return -y * sy + ty; } } }
Maintained by John Loomis, updated Wed Mar 14 14:11:24 2018