Example usage for javax.swing Spring minus

Introduction

In this page you can find the example usage for javax.swing Spring minus.

Prototype

public static Spring minus(Spring s) 

Source Link

Document

Returns -s : a spring running in the opposite direction to s .

Usage

From source file:CompassButtons.java

public CompassButtons(String terrain) {
    super("SpringLayout Compass Demo");
    setSize(500, 300);//ww w.  ja  va 2 s  .c  om
    setDefaultCloseOperation(EXIT_ON_CLOSE);

    SpringLayout sl = new SpringLayout();
    Container c = getContentPane();
    c.setLayout(sl);

    int offset = 50; // gap between buttons and outside edge
    int w = 80; // width of buttons
    int h = 26; // height of buttons
    int border = 3; // border around viewport

    Spring offsetS = Spring.constant(offset);
    Spring borderS = Spring.constant(border);
    Spring widthS = Spring.constant(w);
    Spring halfWidthS = FractionSpring.half(widthS);
    Spring heightS = Spring.constant(h);
    Spring halfHeightS = FractionSpring.half(heightS);
    Spring leftEdgeS = sl.getConstraint(SpringLayout.WEST, c);
    Spring topEdgeS = sl.getConstraint(SpringLayout.NORTH, c);
    Spring rightEdgeS = sl.getConstraint(SpringLayout.EAST, c);
    Spring bottomEdgeS = sl.getConstraint(SpringLayout.SOUTH, c);
    Spring xCenterS = FractionSpring.half(rightEdgeS);
    Spring yCenterS = FractionSpring.half(bottomEdgeS);
    Spring leftBorder = Spring.sum(leftEdgeS, borderS);
    Spring topBorder = Spring.sum(topEdgeS, borderS);

    Spring northX = Spring.sum(xCenterS, Spring.minus(halfWidthS));
    Spring southY = Spring.sum(bottomEdgeS, Spring.minus(Spring.sum(heightS, offsetS)));
    Spring eastX = Spring.sum(rightEdgeS, Spring.minus(Spring.sum(widthS, offsetS)));
    Spring eastY = Spring.sum(yCenterS, Spring.minus(halfHeightS));

    c.add(nb, new SpringLayout.Constraints(northX, offsetS, widthS, heightS));
    c.add(sb, new SpringLayout.Constraints(northX, southY, widthS, heightS));

    c.add(wb);
    sl.getConstraints(wb).setX(offsetS);
    sl.getConstraints(wb).setY(eastY);
    sl.getConstraints(wb).setWidth(widthS);
    sl.getConstraints(wb).setHeight(heightS);

    c.add(eb);
    sl.getConstraints(eb).setX(eastX);
    sl.getConstraints(eb).setY(eastY);
    sl.getConstraints(eb).setWidth(widthS);
    sl.getConstraints(eb).setHeight(heightS);

    c.add(viewport); // this sets a bounds of (0,0,pref_width,pref_height)
    // The order here is important...need to have a valid width and height
    // in place before binding the (x,y) location
    sl.putConstraint(SpringLayout.SOUTH, viewport, Spring.minus(borderS), SpringLayout.SOUTH, c);
    sl.putConstraint(SpringLayout.EAST, viewport, Spring.minus(borderS), SpringLayout.EAST, c);
    sl.putConstraint(SpringLayout.NORTH, viewport, topBorder, SpringLayout.NORTH, c);
    sl.putConstraint(SpringLayout.WEST, viewport, leftBorder, SpringLayout.WEST, c);

    ImageIcon icon = new ImageIcon(getClass().getResource(terrain));
    viewport.setView(new JLabel(icon));

    // Hook up the buttons. See the CompassScroller class (on-line) for
    // details
    // on controlling the viewport.
    nb.setActionCommand(CompassScroller.NORTH);
    sb.setActionCommand(CompassScroller.SOUTH);
    wb.setActionCommand(CompassScroller.WEST);
    eb.setActionCommand(CompassScroller.EAST);
    CompassScroller scroller = new CompassScroller(viewport);
    nb.addActionListener(scroller);
    sb.addActionListener(scroller);
    eb.addActionListener(scroller);
    wb.addActionListener(scroller);

    setVisible(true);
}

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