JavaFX 2.x: Translate mouse click coordinate into XYChart axis value -
in javafx 2.x, using xychart , want display (x,y) axis coordinate values of chart mouse move across chart. setup event handler on chart handle setonmousemoved events. however, not sure how convert mouseevent's getx() value chart's coordinate value?
use axis.getvaluefordisplay(displayposition) determine location of mouse in axis value coordinates:
xaxis.getvaluefordisplay(mouseevent.getx()), yaxis.getvaluefordisplay(mouseevent.gety())
here sample reports co-ordinates on mouse hovering in line chart. screen capture doesn't capture mouse cursor - you'll have imagine there ;-)
import javafx.application.application; import javafx.collections.fxcollections; import javafx.event.eventhandler; import javafx.geometry.insets; import javafx.geometry.pos; import javafx.scene.*; import javafx.scene.chart.*; import javafx.scene.control.label; import javafx.scene.input.mouseevent; import javafx.scene.layout.vbox; import javafx.stage.stage; public class linechartwithhovercoords extends application { @override public void start(stage stage) { stage.settitle("line chart sample"); final linechart<number, number> linechart = createchart(); label cursorcoords = createcursorgraphcoordsmonitorlabel(linechart); stage.setscene( new scene( layoutscene( linechart, cursorcoords ) ) ); stage.show(); } private vbox layoutscene(linechart<number, number> linechart, label cursorcoords) { vbox layout = new vbox(10); layout.setpadding(new insets(10)); layout.setalignment(pos.center); layout.getchildren().setall( cursorcoords, linechart ); return layout; } private linechart<number, number> createchart() { final numberaxis xaxis = new numberaxis(); final numberaxis yaxis = new numberaxis(); xaxis.setlabel("number of month"); final linechart<number,number> linechart = new linechart<>(xaxis,yaxis); linechart.settitle("stock monitoring, 2010"); xychart.series<number, number> series = new xychart.series<>( "my portfolio", fxcollections.<xychart.data<number, number>>observablearraylist( new xychart.data<number, number>(1, 23), new xychart.data<number, number>(2, 14), new xychart.data<number, number>(3, 15), new xychart.data<number, number>(4, 24), new xychart.data<number, number>(5, 34), new xychart.data<number, number>(6, 36), new xychart.data<number, number>(7, 22), new xychart.data<number, number>(8, 45), new xychart.data<number, number>(9, 43), new xychart.data<number, number>(10, 17), new xychart.data<number, number>(11, 29), new xychart.data<number, number>(12, 25) ) ); linechart.getdata().add(series); return linechart; } private label createcursorgraphcoordsmonitorlabel(linechart<number, number> linechart) { final axis<number> xaxis = linechart.getxaxis(); final axis<number> yaxis = linechart.getyaxis(); final label cursorcoords = new label(); final node chartbackground = linechart.lookup(".chart-plot-background"); (node n: chartbackground.getparent().getchildrenunmodifiable()) { if (n != chartbackground && n != xaxis && n != yaxis) { n.setmousetransparent(true); } } chartbackground.setonmouseentered(new eventhandler<mouseevent>() { @override public void handle(mouseevent mouseevent) { cursorcoords.setvisible(true); } }); chartbackground.setonmousemoved(new eventhandler<mouseevent>() { @override public void handle(mouseevent mouseevent) { cursorcoords.settext( string.format( "(%.2f, %.2f)", xaxis.getvaluefordisplay(mouseevent.getx()), yaxis.getvaluefordisplay(mouseevent.gety()) ) ); } }); chartbackground.setonmouseexited(new eventhandler<mouseevent>() { @override public void handle(mouseevent mouseevent) { cursorcoords.setvisible(false); } }); xaxis.setonmouseentered(new eventhandler<mouseevent>() { @override public void handle(mouseevent mouseevent) { cursorcoords.setvisible(true); } }); xaxis.setonmousemoved(new eventhandler<mouseevent>() { @override public void handle(mouseevent mouseevent) { cursorcoords.settext( string.format( "x = %.2f", xaxis.getvaluefordisplay(mouseevent.getx()) ) ); } }); xaxis.setonmouseexited(new eventhandler<mouseevent>() { @override public void handle(mouseevent mouseevent) { cursorcoords.setvisible(false); } }); yaxis.setonmouseentered(new eventhandler<mouseevent>() { @override public void handle(mouseevent mouseevent) { cursorcoords.setvisible(true); } }); yaxis.setonmousemoved(new eventhandler<mouseevent>() { @override public void handle(mouseevent mouseevent) { cursorcoords.settext( string.format( "y = %.2f", yaxis.getvaluefordisplay(mouseevent.gety()) ) ); } }); yaxis.setonmouseexited(new eventhandler<mouseevent>() { @override public void handle(mouseevent mouseevent) { cursorcoords.setvisible(false); } }); return cursorcoords; } public static void main(string[] args) { launch(args); } }
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