y.view
Class MagnifierViewMode

java.lang.Object
  y.view.ViewMode
      y.view.MagnifierViewMode

All Implemented Interfaces:

MouseListener, MouseMotionListener, EventListener, MouseInputListener

public class MagnifierViewMode
extends ViewMode

View mode that lets you zoom into a view region locally, while preserving the original viewport of the view. The effect is similar to a magnifier that is moved over the view.

Field Summary

Fields inherited from class y.view.ViewMode

ACTIVE_PROPERTY, ACTIVE_VIEW_PROPERTY, CHILD_MODE_PROPERTY, EDITING_PROPERTY, GRAB_FOCUS_ENABLED_PROPERTY, lastClickEvent, lastDragEvent, lastMoveEvent, lastPressEvent, lastReleaseEvent, MODIFIER_MASK_PROPERTY, NAME_PROPERTY, originalX, originalY, PARENT_MODE_PROPERTY, view

Constructor Summary

MagnifierViewMode()

Method Summary

void	activate(boolean activate) Upon activation or deactivation the set of registered mouse wheel listeners will be changed.
protected int	calcRadius(int radius, int amount) Calculates and returns an updated magnifier radius.
protected double	calcZoom(double zoom, int amount) Calculates and returns an updated magnifier zoom level.
protected Graph2DView	createMagnifierView() Creates, configures, and returns a Graph2DView that is used to render the view content for the magnifier.
int	getMagnifierRadius() Returns the radius of the magnifying glass.
double	getMagnifierZoomFactor() Returns the zoom factor used for the magnifier view.
boolean	isMouseWheelEnabled() Returns whether or not to activate mouse wheel functionality.
void	mouseDraggedLeft(double x, double y) Updates the location of the magnifier.
void	mouseDraggedRight(double x, double y) Updates the location of the magnifier.
void	mouseExited(MouseEvent e) Removes the magnifier from the view.
void	mouseMoved(double x, double y) Updates the location of the magnifier.
void	mouseWheelMoved(MouseWheelEvent e) Invoked when the mouse wheel is rotated.
void	setMagnifierRadius(int radius) Sets the radius of the magnifying glass.
void	setMagnifierZoomFactor(double zoomFactor) Sets the zoom factor used for the magnifier view.
void	setMouseWheelEnabled(boolean mouseWheelEnabled) Whether or not to activate mouse wheel functionality.

Methods inherited from class y.view.ViewMode

addPropertyChangeListener, addPropertyChangeListener, cancelEditing, firePropertyChange, firePropertyChange, firePropertyChange, getChild, getGraph2D, getGridX, getGridY, getHitInfo, getHitInfo, getLastHitInfo, getModifierMask, getName, getParent, init, isActive, isEditing, isGrabFocusEnabled, isGridMode, isModifierPressed, mouseClicked, mouseClicked, mouseDragged, mouseDraggedMiddle, mouseEntered, mouseMoved, mousePressed, mousePressedLeft, mousePressedMiddle, mousePressedRight, mouseReleased, mouseReleased, mouseReleasedLeft, mouseReleasedMiddle, mouseReleasedRight, mouseShiftPressedLeft, mouseShiftPressedMiddle, mouseShiftPressedRight, mouseShiftReleasedLeft, mouseShiftReleasedMiddle, mouseShiftReleasedRight, reactivateParent, removePropertyChangeListener, removePropertyChangeListener, setActiveView, setChild, setChild, setEditing, setGrabFocusEnabled, setGridMode, setLastHitInfo, setModifierMask, setName, setParent, translateX, translateY

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

MagnifierViewMode

public MagnifierViewMode()

Method Detail

mouseMoved

public void mouseMoved(double x,
                       double y)

Updates the location of the magnifier.

Overrides:

mouseMoved in class ViewMode

Parameters:

x - the x-coordinate of the mouse event in world coordinates.

y - the y-coordinate of the mouse event in world coordinates.

mouseDraggedLeft

public void mouseDraggedLeft(double x,
                             double y)

Updates the location of the magnifier.

Overrides:

mouseDraggedLeft in class ViewMode

Parameters:

x - the x-coordinate of the mouse event in world coordinates.

y - the y-coordinate of the mouse event in world coordinates.

mouseDraggedRight

public void mouseDraggedRight(double x,
                              double y)

Updates the location of the magnifier.

Overrides:

mouseDraggedRight in class ViewMode

Parameters:

x - the x-coordinate of the mouse event in world coordinates.

y - the y-coordinate of the mouse event in world coordinates.

mouseExited

public void mouseExited(MouseEvent e)

Removes the magnifier from the view.

Specified by:

mouseExited in interface MouseListener

Overrides:

mouseExited in class ViewMode

createMagnifierView

protected Graph2DView createMagnifierView()

Creates, configures, and returns a Graph2DView that is used to render the view content for the magnifier.

By default this method adopts various settings of the underlying Graph2DView. It also sets the paintDetailThreshold to 0.0.

activate

public void activate(boolean activate)

Upon activation or deactivation the set of registered mouse wheel listeners will be changed.

Overrides:

activate in class ViewMode

Parameters:

activate - set true when mode was activated false otherwise

See Also:

setMouseWheelEnabled(boolean)

setMagnifierZoomFactor

public void setMagnifierZoomFactor(double zoomFactor)

Sets the zoom factor used for the magnifier view. The zoom factor will be multiplied with the current zoom factor of the main view to obtain the final zoom factor applied to the magnified items.

By default a zoom factor of 2.0 is used.

getMagnifierZoomFactor

public double getMagnifierZoomFactor()

Returns the zoom factor used for the magnifier view.

See Also:

setMagnifierZoomFactor(double)

setMagnifierRadius

public void setMagnifierRadius(int radius)

Sets the radius of the magnifying glass. The radius is measured in view coordinates (pixel space), and not in world coordinates.

By default a radius of 100 is used.

getMagnifierRadius

public int getMagnifierRadius()

Returns the radius of the magnifying glass.

See Also:

setMagnifierRadius(int)

mouseWheelMoved

public void mouseWheelMoved(MouseWheelEvent e)

Invoked when the mouse wheel is rotated.

See Also:

MouseWheelEvent

calcRadius

protected int calcRadius(int radius,
                         int amount)

Calculates and returns an updated magnifier radius. This method is invoked upon a radius change request triggered by a mouse wheel action. Subclasses may override this method to implement customized behavior.

Parameters:

radius - the current magnifier radius

amount - the amount of scroll wheel rotation or units to scroll. This value can be positive and negative.

calcZoom

protected double calcZoom(double zoom,
                          int amount)

Calculates and returns an updated magnifier zoom level. This method is invoked upon a radius change request triggered by a mouse wheel action. Subclasses may override this method to implement customized behavior.

Parameters:

zoom - the current magnifier zoom level

amount - the amount of scroll wheel rotation or units to scroll. This value can be positive and negative.

isMouseWheelEnabled

public boolean isMouseWheelEnabled()

Returns whether or not to activate mouse wheel functionality.

setMouseWheelEnabled

public void setMouseWheelEnabled(boolean mouseWheelEnabled)

Whether or not to activate mouse wheel functionality. If enabled, a mouse wheel listener will be added to the main view that will allow to change the radius and zoom factor of the magnifying glass interactively. By default, the mouse wheel changes the zoom factor. If, additionally, the CTRL key is pressed, the mouse wheel changes the radius.

Note that when this feature is enabled, already registered mouse wheel listeners will be deregistered until this mode is deactivated again.

Parameters:

mouseWheelEnabled -