ingo@534: package de.intevation.flys.client.client.ui.chart;
ingo@534: 
raimund@2477: import java.util.ArrayList;
raimund@2477: 
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@3549:  * Panel showing the mouse position in data space.
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: 
felix@4038:     /** Is associated to a ChartTab. */
ingo@538:     protected ChartOutputTab chartTab;
ingo@538: 
raimund@2477:     protected HLayout xLayout;
raimund@2477:     protected ArrayList<HLayout> yLayouts;
ingo@534: 
felix@4038: 
ingo@538:     public MousePositionPanel(ChartOutputTab chartTab) {
ingo@534:         super();
ingo@534: 
ingo@538:         this.chartTab = chartTab;
ingo@534: 
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: 
raimund@2477:         xLayout = null;
raimund@2477:         yLayouts = new ArrayList<HLayout>();
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) {
raimund@2477:         int transformerCount = chartTab.getTransformerCount();
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: 
raimund@2477:         // Create Layout for x coordinates.
raimund@2477:         if (xLayout == null){
raimund@2477:             Label xDesc  = new Label("Position: X = ");
raimund@2477:             Label xLabel = new Label();
raimund@2477:             xLayout      = new HLayout();
raimund@2477:             xLayout.setWidth(125);
raimund@2477:             xLayout.addMember(xDesc);
raimund@2477:             xLayout.addMember(xLabel);
raimund@2477:             xDesc.setWidth(70);
raimund@2477:             xLabel.setWidth(55);
raimund@2477:             addMember(xLayout);
raimund@2477:         }
ingo@538: 
raimund@2477:         for (int i = 0; i < transformerCount; i++) {
raimund@2477:             HLayout yLayout = null;
raimund@2477:             // If no layout exists for this y axis, create one.
raimund@2477:             // else use the existing one.
raimund@2477:             if (yLayouts.size() <= i) {
raimund@2477:                 Label yDesc     = new Label("Y" + (i+1) + " = ");
raimund@2477:                 Label yLabel    = new Label();
raimund@2477:                 yLayout = new HLayout();
raimund@2477:                 yLayout.setWidth(80);
raimund@2477:                 yLayout.addMember(yDesc);
raimund@2477:                 yLayout.addMember(yLabel);
raimund@2477:                 yDesc.setWidth(30);
raimund@2477:                 yLabel.setWidth(50);
raimund@2477:                 addMember(yLayout);
raimund@2477:                 yLayouts.add(i, yLayout);
raimund@2477:             }
raimund@2477:             else {
raimund@2477:                 yLayout = yLayouts.get(i);
raimund@2477:             }
raimund@2477: 
raimund@2477:             Transform2D transformer = chartTab.getTransformer(i);
raimund@2477: 
raimund@2477:             if (transformer == null) {
raimund@2477:                 return;
raimund@2477:             }
raimund@2477: 
raimund@2477:             // Get the label for the coordinates.
raimund@2477:             Canvas xLabel = xLayout.getMember(1);
raimund@2477:             Canvas yLabel = yLayout.getMember(1);
raimund@2477: 
felix@4038:             double[] xy    = transformer.transform(x, y);
raimund@2477:             String[] xyStr = transformer.format(new Number[] {
raimund@2477:                 new Double(xy[0]), new Double(xy[1]) });
raimund@2477:             // Set the coordinates.
raimund@2477:             xLabel.setContents(xyStr[0]);
raimund@2477:             yLabel.setContents(xyStr[1]);
raimund@2477:         }
raimund@2477: 
raimund@2477:         // Remove y coordinates.
raimund@2477:         if (yLayouts.size() > transformerCount) {
raimund@2477:             for (int i = yLayouts.size() - 1; i >= transformerCount; i--) {
raimund@2477:                 removeMember(yLayouts.get(i));
raimund@2477:                 yLayouts.remove(i);
raimund@2477:             }
raimund@2477:         }
ingo@534:     }
ingo@534: }
ingo@534: // vim:set ts=4 sw=4 si et sta sts=4 fenc=utf8 :