Java PAffineTransform.transform方法代碼示例

import org.piccolo2d.util.PAffineTransform; //導入方法依賴的package包/類
/**
 * We do the same thing we did in getViewPosition above to flip the
 * document-window position relationship
 * 
 * @param x The new x position
 * @param y The new y position
 */
public void setViewPosition(final double x, final double y) {
    if (camera == null)
        return;

    // If a scroll is in progress - we ignore new scrolls - if we
    // didn't, since the scrollbars depend on the camera location
    // we can end up with an infinite loop
    if (scrollInProgress)
        return;

    scrollInProgress = true;

    // Get the union of all the layers' bounds
    final PBounds layerBounds = new PBounds();
    final List layers = camera.getLayersReference();
    for (final Iterator i = layers.iterator(); i.hasNext();) {
        final PLayer layer = (PLayer) i.next();
        layerBounds.add(layer.getFullBoundsReference());
    }

    final PAffineTransform at = camera.getViewTransform();
    at.transform(layerBounds, layerBounds);

    // Union the camera view bounds
    final PBounds viewBounds = camera.getBoundsReference();
    layerBounds.add(viewBounds);

    // Now find the new view position in view coordinates -
    // This is basically the distance from the lower right
    // corner of the window to the upper left corner of the
    // document
    // We then measure the offset from the lower right corner
    // of the document
    final Point2D newPoint = new Point2D.Double(layerBounds.getX() + layerBounds.getWidth()
            - (x + viewBounds.getWidth()), layerBounds.getY() + layerBounds.getHeight()
            - (y + viewBounds.getHeight()));

    // Now transform the new view position into global coords
    camera.localToView(newPoint);

    // Compute the new matrix values to put the camera at the
    // correct location
    final double newX = -(at.getScaleX() * newPoint.getX() + at.getShearX() * newPoint.getY());
    final double newY = -(at.getShearY() * newPoint.getX() + at.getScaleY() * newPoint.getY());

    at.setTransform(at.getScaleX(), at.getShearY(), at.getShearX(), at.getScaleY(), newX, newY);

    // Now actually set the camera's transform
    camera.setViewTransform(at);
    scrollInProgress = false;
}
 

import org.piccolo2d.util.PAffineTransform; //導入方法依賴的package包/類
/**
 * We do the same thing we did in getViewPosition above to flip the
 * document-window position relationship
 * 
 * @param x The new x position
 * @param y The new y position
 */
public void setViewPosition(final double x, final double y) {
    if (camera == null)
        return;

    // If a scroll is in progress - we ignore new scrolls - if we
    // didn't, since the scrollbars depend on the camera
    // location we can end up with an infinite loop
    if (scrollInProgress)
        return;

    scrollInProgress = true;

    // Get the union of all the layers' bounds
    final PBounds layerBounds = new PBounds();
    final java.util.List layers = camera.getLayersReference();
    for (final Iterator i = layers.iterator(); i.hasNext();) {
        final PLayer layer = (PLayer) i.next();
        layerBounds.add(layer.getFullBoundsReference());
    }

    final PAffineTransform at = camera.getViewTransform();
    at.transform(layerBounds, layerBounds);

    // Union the camera view bounds
    final PBounds viewBounds = camera.getBoundsReference();
    layerBounds.add(viewBounds);

    // Now find the new view position in view coordinates -
    // This is basically the distance from the lower right
    // corner of the window to the upper left corner of the
    // document. We then measure the offset from the lower right corner
    // of the document
    final Point2D newPoint = new Point2D.Double(layerBounds.getX() + layerBounds.getWidth()
            - (x + viewBounds.getWidth()), layerBounds.getY() + layerBounds.getHeight()
            - (y + viewBounds.getHeight()));

    // Now transform the new view position into global coords
    camera.localToView(newPoint);

    // Compute the new matrix values to put the camera at the
    // correct location
    final double newX = -(at.getScaleX() * newPoint.getX() + at.getShearX() * newPoint.getY());
    final double newY = -(at.getShearY() * newPoint.getX() + at.getScaleY() * newPoint.getY());

    at.setTransform(at.getScaleX(), at.getShearY(), at.getShearX(), at.getScaleY(), newX, newY);

    // Now actually set the camera's transform
    camera.setViewTransform(at);
    scrollInProgress = false;
}
 

import org.piccolo2d.util.PAffineTransform; //導入方法依賴的package包/類
/**
 * Set the view position in a manner consistent with standardized scrolling.
 * 
 * @param x The new x position
 * @param y The new y position
 */
public void setViewPosition(final double x, final double y) {
    // Bail out if scrollInProgress because we can end up with an infinite
    // loop since the scrollbars depend on the camera location
    if (camera == null || scrollInProgress) {
        return;
    }

    scrollInProgress = true;

    // Get the union of all the layers' bounds
    final PBounds layerBounds = new PBounds();
    final List layers = camera.getLayersReference();
    for (final Iterator i = layers.iterator(); i.hasNext();) {
        final PLayer layer = (PLayer) i.next();
        layerBounds.add(layer.getFullBoundsReference());
    }

    final PAffineTransform at = camera.getViewTransform();
    at.transform(layerBounds, layerBounds);

    // Union the camera bounds
    final PBounds viewBounds = camera.getBoundsReference();
    layerBounds.add(viewBounds);

    // Now find the new view position in view coordinates
    final Point2D newPoint = new Point2D.Double(layerBounds.getX() + x, layerBounds.getY() + y);

    // Now transform the new view position into global coords
    camera.localToView(newPoint);

    // Compute the new matrix values to put the camera at the
    // correct location
    final double newX = -(at.getScaleX() * newPoint.getX() + at.getShearX() * newPoint.getY());
    final double newY = -(at.getShearY() * newPoint.getX() + at.getScaleY() * newPoint.getY());

    at.setTransform(at.getScaleX(), at.getShearY(), at.getShearX(), at.getScaleY(), newX, newY);

    // Now actually set the camera's transform
    camera.setViewTransform(at);
    scrollInProgress = false;
}