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Add zooming to SmartChart
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2 files changed

+286
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‎SmartChart/src/edu/nr/NRChart.java

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package edu.nr;
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import javafx.beans.InvalidationListener;
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import javafx.beans.binding.BooleanBinding;
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import javafx.beans.property.BooleanProperty;
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import javafx.beans.property.ObjectProperty;
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import javafx.beans.property.SimpleBooleanProperty;
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import javafx.beans.property.SimpleObjectProperty;
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import javafx.beans.value.ChangeListener;
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import javafx.beans.value.ObservableBooleanValue;
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import javafx.event.EventHandler;
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import javafx.geometry.Point2D;
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import javafx.scene.chart.LineChart;
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import javafx.scene.chart.NumberAxis;
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import javafx.scene.input.MouseEvent;
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import javafx.scene.shape.Rectangle;
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import java.io.*;
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import java.nio.file.FileAlreadyExistsException;
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import java.nio.file.Files;
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import java.nio.file.Paths;
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import java.util.ArrayList;
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/**
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* Created by Nashoba1768 on 1/22/2017.
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*/
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class NRChart extends LineChart<Number, Number>
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{
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private Series series = new Series();
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private long startTimeMillis;
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SmartChart chart;
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public BooleanProperty isAutoZooming;
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public NRChart(SmartChart chart)
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{
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super(new NumberAxis(), new NumberAxis());
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setAnimated(false);
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isAutoZooming = new SimpleBooleanProperty();
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setAutoZooming(true);
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((NumberAxis)getXAxis()).setForceZeroInRange(false);
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((NumberAxis)getYAxis()).setForceZeroInRange(false);
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setLegendVisible(false);
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getData().add(this.series);
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this.chart = chart;
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}
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public void addValue(double x)
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{
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if(this.series.getData().size() == 0)
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{
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startTimeMillis = System.currentTimeMillis();
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}
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double currentTime = (System.currentTimeMillis() - startTimeMillis)/1000d;
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this.series.getData().add(new Data(currentTime, x));
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if (this.series.getData().size() > 10000) {
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this.series.getData().remove(0);
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}
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}
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public void reset()
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{
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this.series.getData().clear();
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}
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public void save()
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{
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StringBuilder sb = new StringBuilder();
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for(Object x:this.series.getData()) {
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Data<Double,Double> y = (Data<Double, Double>) x;
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sb.append(y.getXValue());
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sb.append(",");
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sb.append(y.getYValue());
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sb.append('\n');
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}
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String fileName = System.getProperty("user.home") + "\\" + this.chart.getName().replace(' ', '_') + ".csv";
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try {
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// Create the empty file with default permissions, etc.
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Files.createFile(Paths.get(fileName));
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} catch (FileAlreadyExistsException x) {
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System.err.format("file named %s" +
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" already exists%n", fileName);
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} catch (IOException x) {
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// Some other sort of failure, such as permissions.
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System.err.format("createFile error: %s%n", x);
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}
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try (Writer writer = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(fileName), "utf-8"))) {
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writer.write(sb.toString());
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} catch (IOException e) {
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e.printStackTrace();
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}
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}
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protected void setUpZooming(final Rectangle rect) {
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final ObjectProperty<Point2D> mouseAnchor = new SimpleObjectProperty<>();
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this.setOnMousePressed(new EventHandler<MouseEvent>() {
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@Override
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public void handle(MouseEvent event) {
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mouseAnchor.set(new Point2D(event.getX(), event.getY()));
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rect.setWidth(0);
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rect.setHeight(0);
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}
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});
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this.setOnMouseDragged(new EventHandler<MouseEvent>() {
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@Override
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public void handle(MouseEvent event) {
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double x = event.getX();
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double y = event.getY();
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rect.setX(Math.min(x, mouseAnchor.get().getX()));
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rect.setY(Math.min(y, mouseAnchor.get().getY()));
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rect.setWidth(Math.abs(x - mouseAnchor.get().getX()));
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rect.setHeight(Math.abs(y - mouseAnchor.get().getY()));
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}
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});
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}
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public void doZoom(Rectangle zoomRect) {
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final NumberAxis yAxis = (NumberAxis) getYAxis();
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final NumberAxis xAxis = (NumberAxis) getXAxis();
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//Point2D yAxisInScene = yAxis.localToScene(0, 0);
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//Point2D xAxisInScene = xAxis.localToScene(0, 0);
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double xtopLeftCornerOfGraph = 52;
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double ytopLeftCornerOfGraph = 17;
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double x = zoomRect.getX() - xtopLeftCornerOfGraph;
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double y = zoomRect.getY() - ytopLeftCornerOfGraph;
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double w = zoomRect.getWidth();
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double h = zoomRect.getHeight();
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double width_pixels = this.getWidth() - 65; //65 is the number of pixels of padding
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double height_pixels = this.getHeight() - 65;
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double width_value = xAxis.getUpperBound() - xAxis.getLowerBound();
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double height_value = yAxis.getUpperBound() - yAxis.getLowerBound();
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//Point2D zoomTopLeft = new Point2D(zoomRect.getX(), zoomRect.getY());
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//Point2D zoomBottomRight = new Point2D(zoomRect.getX() + zoomRect.getWidth(), zoomRect.getY() + zoomRect.getHeight());
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//double xOffset = zoomTopLeft.getX() - yAxisInScene.getX();
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//double yOffset = zoomBottomRight.getY() - xAxisInScene.getY();
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double xAxisScale = width_pixels/width_value;
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double yAxisScale = height_pixels/height_value;
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double xLower = xAxis.getLowerBound();
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double yUpper = yAxis.getUpperBound();
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xAxis.setLowerBound(xLower + x / xAxisScale);
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xAxis.setUpperBound(xLower + (x+w)/ xAxisScale);
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yAxis.setUpperBound(yUpper - y / yAxisScale);
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yAxis.setLowerBound(yUpper - (y+h) / yAxisScale);
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zoomRect.setWidth(0);
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zoomRect.setHeight(0);
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}
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public double getLowestX() {
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if(this.series.getData().size() == 0) {
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return 0;
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}
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return ((Data<Double,Double>) this.series.getData().get(0)).getXValue();
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}
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public double getLowestY() {
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if(this.series.getData().size() == 0) {
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return 0;
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}
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double minValue = ((Data<Double,Double>) this.series.getData().get(0)).getYValue();
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for(int i=0; i<this.series.getData().size(); i++){
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if(((Data<Double,Double>) this.series.getData().get(i)).getYValue() < minValue) {
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minValue = ((Data<Double, Double>) this.series.getData().get(i)).getYValue();
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}
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}
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return minValue;
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}
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public double getHighestX() {
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if(this.series.getData().size() == 0) {
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return 110;
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}
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return ((Data<Double,Double>) this.series.getData().get(this.series.getData().size()-1)).getXValue();
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}
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public double getHighestY() {
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if(this.series.getData().size() == 0) {
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return 110;
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}
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double maxValue = ((Data<Double,Double>) this.series.getData().get(0)).getYValue();
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for(int i=0; i<this.series.getData().size(); i++){
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if(((Data<Double,Double>) this.series.getData().get(i)).getYValue() > maxValue){
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maxValue = ((Data<Double,Double>) this.series.getData().get(i)).getYValue();
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}
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}
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return maxValue;
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}
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public void setAutoZooming(boolean val) {
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getXAxis().setAutoRanging(val);
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getYAxis().setAutoRanging(val);
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isAutoZooming.set(val);
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}
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public boolean isAutoZooming() {
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return isAutoZooming.get();
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}
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}

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