CLASSE JComponentVista

/*
* JComponentVista.java
*
* Created on 24 ottobre 2004, 11.20
*/

package javaapplication4;



import java.awt.*;
import java.awt.print.*;
import javax.swing.*;
public class JComponentVista extends Vista implements Printable {

private static final boolean SYMMETRIC_SCALING = true;
private static final boolean ASYMMETRIC_SCALING = false;
private double mScaleX;
private double mScaleY;
/**
* The Swing component to print.
*/
private JComponent mComponent;
/**
* Create a Pageable that can print a
* Swing JComponent over multiple pages.
*
* @param c The swing JComponent to be printed.
*
* @param format The size of the pages over which
* the componenent will be printed.
*/
public JComponentVista(JComponent c, PageFormat format) {
setPageFormat(format);
setPrintable(this);
setComponent(c);
/* Tell the Vista we subclassed the size of the canvas.
*/
Rectangle componentBounds = c.getBounds(null);
setSize(componentBounds.width, componentBounds.height);
setScale(1, 1);
}

protected void setComponent(JComponent c) {
mComponent = c;
}

protected void setScale(double scaleX, double scaleY) {
mScaleX = scaleX;
mScaleY = scaleY;
}

public void scaleToFitX() {
PageFormat format = getPageFormat();
Rectangle componentBounds = mComponent.getBounds(null);
double scaleX = format.getImageableWidth() /componentBounds.width;
double scaleY = scaleX;
if (scaleX < 1) {
setSize( (float) format.getImageableWidth(),
(float) (componentBounds.height * scaleY));
setScale(scaleX, scaleY);
}
}

public void scaleToFitY() {
PageFormat format = getPageFormat();
Rectangle componentBounds = mComponent.getBounds(null);
double scaleY = format.getImageableHeight() /componentBounds.height;
double scaleX = scaleY;
if (scaleY < 1) {
setSize( (float) (componentBounds.width * scaleX),(float) format.getImageableHeight());
setScale(scaleX, scaleY);
}
}

public void scaleToFit(boolean useSymmetricScaling) {
PageFormat format = getPageFormat();
Rectangle componentBounds = mComponent.getBounds(null);
double scaleX = format.getImageableWidth() /componentBounds.width;
double scaleY = format.getImageableHeight() /componentBounds.height;
System.out.println("Scale: " + scaleX + " " + scaleY);
if (scaleX < 1 || scaleY < 1) {
if (useSymmetricScaling) {
if (scaleX < scaleY) {
scaleY = scaleX;
} else {
scaleX = scaleY;
}
}
setSize( (float) (componentBounds.width * scaleX), (float) (componentBounds.height * scaleY) );
setScale(scaleX, scaleY);
}
}

public int print(Graphics graphics, PageFormat pageFormat, int pageIndex) throws PrinterException {
Graphics2D g2 = (Graphics2D) graphics;
g2.translate(pageFormat.getImageableX(), pageFormat.getImageableY());
Rectangle componentBounds = mComponent.getBounds(null);
g2.translate(-componentBounds.x, -componentBounds.y);
g2.scale(mScaleX, mScaleY);
boolean wasBuffered = mComponent.isDoubleBuffered();
mComponent.paint(g2);
mComponent.setDoubleBuffered(wasBuffered);
return PAGE_EXISTS;
}

}