ingo@534: package de.intevation.flys.client.client.ui.chart;
ingo@534: 
ingo@538: import com.google.gwt.i18n.client.NumberFormat;
ingo@538: 
ingo@534: import com.smartgwt.client.widgets.Canvas;
ingo@534: import com.smartgwt.client.widgets.Label;
ingo@534: import com.smartgwt.client.widgets.layout.HLayout;
ingo@534: import com.smartgwt.client.widgets.events.MouseMoveEvent;
ingo@534: import com.smartgwt.client.widgets.events.MouseMoveHandler;
ingo@538: 
ingo@538: import de.intevation.flys.client.shared.Transform2D;
ingo@534: 
ingo@534: 
ingo@534: /**
ingo@534:  * @author <a href="mailto:ingo.weinzierl@intevation.de">Ingo Weinzierl</a>
ingo@534:  */
ingo@538: public class MousePositionPanel extends HLayout implements MouseMoveHandler {
ingo@538: 
ingo@538:     protected ChartOutputTab chartTab;
ingo@538: 
ingo@538:     protected NumberFormat nf;
ingo@534: 
ingo@534:     protected Label x;
ingo@534:     protected Label y;
ingo@534: 
ingo@534: 
ingo@538:     public MousePositionPanel(ChartOutputTab chartTab) {
ingo@534:         super();
ingo@534: 
ingo@538:         this.chartTab = chartTab;
ingo@534: 
ingo@534:         x = new Label();
ingo@534:         y = new Label();
ingo@534: 
ingo@538:         nf = NumberFormat.getDecimalFormat();
ingo@538: 
ingo@538:         chartTab.getChartPanel().addMouseMoveHandler(this);
ingo@538: 
ingo@534:         initLayout();
ingo@534:     }
ingo@534: 
ingo@534: 
ingo@534:     /**
ingo@539:      * Initializes the layout of this component. <b>Note:</b> This layout has a
ingo@539:      * fixed width of 195px plus a margin of 5px.
ingo@534:      */
ingo@534:     protected void initLayout() {
ingo@534:         setMembersMargin(5);
ingo@534: 
ingo@534:         Label xDesc = new Label("Position: X = ");
ingo@534:         Label yDesc  = new Label("Y = ");
ingo@534: 
ingo@539:         HLayout xLayout = new HLayout();
ingo@539:         xLayout.setWidth(125);
ingo@539:         xLayout.addMember(xDesc);
ingo@539:         xLayout.addMember(x);
ingo@539: 
ingo@539:         HLayout yLayout = new HLayout();
ingo@539:         yLayout.setWidth(70);
ingo@539:         yLayout.addMember(yDesc);
ingo@539:         yLayout.addMember(y);
ingo@539: 
ingo@539:         xDesc.setWidth(70);
ingo@539:         x.setWidth(55);
ingo@534:         yDesc.setWidth(20);
ingo@539:         y.setWidth(50);
ingo@534: 
ingo@539:         addMember(xLayout);
ingo@539:         addMember(yLayout);
ingo@534:     }
ingo@534: 
ingo@534: 
ingo@534:     /**
ingo@538:      * /Updates the X value displayed in the <i>x</i> label.
ingo@534:      *
ingo@538:      * @param x the new x value.
ingo@534:      */
ingo@1598:     public void setX(String x) {
ingo@1598:         this.x.setContents(x);
ingo@534:     }
ingo@534: 
ingo@534: 
ingo@534:     /**
ingo@538:      * /Updates the Y value displayed in the <i>y</i> label.
ingo@534:      *
ingo@538:      * @param y the new y value.
ingo@534:      */
ingo@1598:     public void setY(String y) {
ingo@1598:         this.y.setContents(y);
ingo@534:     }
ingo@534: 
ingo@534: 
ingo@534:     /**
ingo@538:      * Listens to mouse move events to refresh the xy position.
ingo@534:      *
ingo@538:      * @param event The move event.
ingo@534:      */
ingo@538:     public void onMouseMove(MouseMoveEvent event) {
ingo@538:         updateMousePosition(event.getX(), event.getY());
ingo@534:     }
ingo@534: 
ingo@534: 
ingo@534:     /**
ingo@538:      * This method takes pixel coordinates, transforms those values into chart
ingo@538:      * coordinates using the Transform2D class and updates the mouse position.
ingo@534:      *
ingo@538:      * @param x The x part of the pixel.
ingo@538:      * @param y The y part of the pixel.
ingo@534:      */
ingo@538:     public void updateMousePosition(double x, double y) {
ingo@538:         Transform2D transformer = chartTab.getTransformer();
ingo@534: 
ingo@538:         if (transformer == null) {
ingo@538:             return;
ingo@538:         }
ingo@534: 
ingo@538:         Canvas chart = chartTab.getChartPanel();
ingo@538:         int xOffset = chart.getPageLeft();
ingo@538:         int yOffset = chart.getPageTop();
ingo@534: 
ingo@538:         x = x - xOffset;
ingo@538:         y = y - yOffset;
ingo@538: 
ingo@1598:         double[] xy    = transformer.transform(x,y);
ingo@1598:         String[] xyStr = transformer.format(new Number[] {
ingo@1598:             new Double(xy[0]), new Double(xy[1]) });
ingo@538: 
ingo@1598:         setX(xyStr[0]);
ingo@1598:         setY(xyStr[1]);
ingo@534:     }
ingo@534: }
ingo@534: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :