jfig.canvas
Class ViewerCanvas

java.lang.Object
  java.awt.Component
      java.awt.Canvas
          jfig.canvas.FigBasicCanvas
              jfig.canvas.ViewerCanvas

All Implemented Interfaces:

javax.accessibility.Accessible, java.util.EventListener, FigCanvas, FullRedraw, java.awt.image.ImageObserver, java.awt.MenuContainer, java.awt.event.MouseListener, java.awt.event.MouseMotionListener, ObjectPainter, java.io.Serializable, SyncPainter

public class ViewerCanvas

extends FigBasicCanvas

object canvas for the jfig viewer.

ViewerCanvas provides the object canvas for the jfig viewer. It is realized as a simple subclass of FigBasicCanvas, with additional support for mouse dragging to move the whole drawing (like, e.g., the Acrobat Reader), and some additional zoom options.

See Also:

FigBasicCanvas, Serialized Form

Nested Class Summary

Nested classes inherited from class jfig.canvas.FigBasicCanvas

FigBasicCanvas.Options2D

Nested classes inherited from class java.awt.Canvas

java.awt.Canvas.AccessibleAWTCanvas

Nested classes inherited from class java.awt.Component

java.awt.Component.AccessibleAWTComponent, java.awt.Component.BltBufferStrategy, java.awt.Component.FlipBufferStrategy

Field Summary

java.awt.Cursor

moveCursor

Fields inherited from class jfig.canvas.FigBasicCanvas

backgroundColor, BASE_ANCHOR_X, BASE_ANCHOR_Y, canvasListener, cur_height, cur_width, cur_x, cur_y, debug, defaultColor, defaultCursor, enableTimingInfo, gridColor, gridGR, gridMode, gridVisible, helper, mouse_drag_x, mouse_drag_y, n_grid, n_redraws, n_trials_to_create_offscreenImage, n_updates, objectEnumerator, objectGR, offscreenGR, offscreenImage, old_x, old_y, pdbg, printer, ptmp, redrawMode, rubberband, RULER_XL_OFFSET, RULER_XR_OFFSET, RULER_YB_OFFSET, RULER_YT_OFFSET, rulerFont, t_delay, t_grid, t_grid_mean, t_redraw, t_redraw_mean, theObserver, tmp_sc, tmp_wc, trafo, waitCursor, zoomListenerVector

Fields inherited from class java.awt.Component

BOTTOM_ALIGNMENT, CENTER_ALIGNMENT, LEFT_ALIGNMENT, RIGHT_ALIGNMENT, TOP_ALIGNMENT

Fields inherited from interface jfig.canvas.FigCanvas

FullRedraw, MouseMotionRedraw, NoChanges, ObjectRedraw, panDOWN, panHOME, panLEFT, panRIGHT, panUP, SyncRedraw, SystemRedraw, TmpObjectRedraw, TmpTextRedraw

Fields inherited from interface java.awt.image.ImageObserver

ABORT, ALLBITS, ERROR, FRAMEBITS, HEIGHT, PROPERTIES, SOMEBITS, WIDTH

Constructor Summary

ViewerCanvas()
ViewerCanvas The default viewer canvas doesn't use neither a grid nor snapping.

Method Summary

void	doZoomIn14() zoom in by a factor of sqrt(two).
void	doZoomOut07()
void	doZoomRegion(FigBbox bbox)
void	doZoomRegionFree(FigBbox bbox)
void	doZoomRegionSnapped(FigBbox bbox)
void	mouseDragged(java.awt.event.MouseEvent evt) Handle MouseDrag events: Currently, mouseDrag events are used for canvas panning.
void	mouseMoved(java.awt.event.MouseEvent evt) Handle mouseMove events: update sliders/cross hatch, provide rubberbanding
void	mousePressed(java.awt.event.MouseEvent evt) Handle mouseDown events: snap to the currently active grid, then call the parent mouseDown action function.
void	mouseReleased(java.awt.event.MouseEvent evt) mouseReleased() is used to detect mouseDrag() events.

Methods inherited from class jfig.canvas.FigBasicCanvas

addCanvasListener, addZoomListener, blitOffscreenBuffer, blitOffscreenBufferClipped, canvasSizeChanged, changeRubberbandMode, changeRubberbandMode, changeRubberbandMode, clearBuffer, clippedDrawTmpObject, doFullRedraw_deadlocks, doFullRedraw, doFullRedraw, doMotionRedraw, doObjectRedraw, doPanning, doSimpleRedraw, doSyncRedraw, doSystemRedraw, doTextRedraw, doToggleRubberbandDebug, doZoom11, doZoomFit, doZoomFull, doZoomIn, doZoomOut, doZoomRegion, drawAllObjects, drawGrid, drawGridByHand, drawGridViaCopyArea, drawObject, drawRulers, drawSliders, drawSlidersAndCursor, drawSlidersOnce, drawTmpObjects, drawTriangles, eraseObject, err, get_current_canvas_size, getBackground, getComponent, getCurrentCanvasSize, getDebug, getGridColor, getMousePosition, getObjectEnumerator, getOffscreenGraphics, getOptions2D, getRedrawMode, getTrafo, getViewportWCmax, getVisibleRegionBoundingBox_OLD, getVisibleRegionBoundingBox, gotFocus, handleRedraw, initializeOffscreenBuffers, isDoubleBuffered, main, mouseClicked, mouseEntered, mouseExited, msg, notifyZoomListeners, paint, paint, paint, print, printAll, printTimingStats, removeZoomListener, repaint, repaint, repaint, repaint, requestAntiAliasing, requestRenderQuality, setBackground, setConsole, setDebug, setDefaultCursor, setGrid, setGridColor, setObjectEnumerator, setRubberbandAspect, setRubberbandBasePoint, setRubberbandBasePoint, setRubberbandBasePoint2, setRubberbandBasePoint2, setRubberbandShowLineLengths, setRulerOffsets, setStatusMessage, setTrafo, showRulers, statusMessage, synchronousRepaint, update

Methods inherited from class java.awt.Canvas

addNotify, createBufferStrategy, createBufferStrategy, getAccessibleContext, getBufferStrategy

Methods inherited from class java.awt.Component

action, add, addComponentListener, addFocusListener, addHierarchyBoundsListener, addHierarchyListener, addInputMethodListener, addKeyListener, addMouseListener, addMouseMotionListener, addMouseWheelListener, addPropertyChangeListener, addPropertyChangeListener, applyComponentOrientation, areFocusTraversalKeysSet, bounds, checkImage, checkImage, coalesceEvents, contains, contains, createImage, createImage, createVolatileImage, createVolatileImage, deliverEvent, disable, disableEvents, dispatchEvent, doLayout, enable, enable, enableEvents, enableInputMethods, firePropertyChange, firePropertyChange, firePropertyChange, getAlignmentX, getAlignmentY, getBounds, getBounds, getColorModel, getComponentAt, getComponentAt, getComponentListeners, getComponentOrientation, getCursor, getDropTarget, getFocusCycleRootAncestor, getFocusListeners, getFocusTraversalKeys, getFocusTraversalKeysEnabled, getFont, getFontMetrics, getForeground, getGraphics, getGraphicsConfiguration, getHeight, getHierarchyBoundsListeners, getHierarchyListeners, getIgnoreRepaint, getInputContext, getInputMethodListeners, getInputMethodRequests, getKeyListeners, getListeners, getLocale, getLocation, getLocation, getLocationOnScreen, getMaximumSize, getMinimumSize, getMouseListeners, getMouseMotionListeners, getMouseWheelListeners, getName, getParent, getPeer, getPreferredSize, getPropertyChangeListeners, getPropertyChangeListeners, getSize, getSize, getToolkit, getTreeLock, getWidth, getX, getY, gotFocus, handleEvent, hasFocus, hide, imageUpdate, inside, invalidate, isBackgroundSet, isCursorSet, isDisplayable, isEnabled, isFocusable, isFocusCycleRoot, isFocusOwner, isFocusTraversable, isFontSet, isForegroundSet, isLightweight, isOpaque, isShowing, isValid, isVisible, keyDown, keyUp, layout, list, list, list, list, list, locate, location, lostFocus, minimumSize, mouseDown, mouseDrag, mouseEnter, mouseExit, mouseMove, mouseUp, move, nextFocus, paintAll, paramString, postEvent, preferredSize, prepareImage, prepareImage, processComponentEvent, processEvent, processFocusEvent, processHierarchyBoundsEvent, processHierarchyEvent, processInputMethodEvent, processKeyEvent, processMouseEvent, processMouseMotionEvent, processMouseWheelEvent, remove, removeComponentListener, removeFocusListener, removeHierarchyBoundsListener, removeHierarchyListener, removeInputMethodListener, removeKeyListener, removeMouseListener, removeMouseMotionListener, removeMouseWheelListener, removeNotify, removePropertyChangeListener, removePropertyChangeListener, repaint, requestFocus, requestFocus, requestFocusInWindow, requestFocusInWindow, reshape, resize, resize, setBounds, setBounds, setComponentOrientation, setCursor, setDropTarget, setEnabled, setFocusable, setFocusTraversalKeys, setFocusTraversalKeysEnabled, setFont, setForeground, setIgnoreRepaint, setLocale, setLocation, setLocation, setName, setSize, setSize, setVisible, show, show, size, toString, transferFocus, transferFocusBackward, transferFocusUpCycle, validate

Methods inherited from class java.lang.Object

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

Methods inherited from interface jfig.canvas.FigCanvas

getCursor, getSize, setCursor

Field Detail

moveCursor

public java.awt.Cursor moveCursor

Constructor Detail

ViewerCanvas

public ViewerCanvas()

ViewerCanvas

The default viewer canvas doesn't use neither a grid nor snapping.

Method Detail

mousePressed

public void mousePressed(java.awt.event.MouseEvent evt)

Description copied from class: FigBasicCanvas

Handle mouseDown events: snap to the currently active grid, then call the parent mouseDown action function.

Specified by:

mousePressed in interface FigCanvas

Overrides:

mousePressed in class FigBasicCanvas

mouseReleased

public void mouseReleased(java.awt.event.MouseEvent evt)

Description copied from class: FigBasicCanvas

mouseReleased() is used to detect mouseDrag() events. On each mouseDown() and at the end of a mouseUp() we reset the values of the mouse_drag_(x,y) variables.

If both the current and the previous mouse_drag_(x,y) position lie in the rulers and differ by more than 5 pixels (to suppress small 'jitter'), we calculate the corresponding viewport panning.

In the future, we should probably provide some kind of visual feedback about the current drag amout by using mouseDrag() to update the rulers correspondingly.

Specified by:

mouseReleased in interface FigCanvas

Overrides:

mouseReleased in class FigBasicCanvas

mouseMoved

public void mouseMoved(java.awt.event.MouseEvent evt)

Description copied from class: FigBasicCanvas

Handle mouseMove events: update sliders/cross hatch, provide rubberbanding

Specified by:

mouseMoved in interface FigCanvas

Overrides:

mouseMoved in class FigBasicCanvas

mouseDragged

public void mouseDragged(java.awt.event.MouseEvent evt)

Description copied from class: FigBasicCanvas

Handle MouseDrag events: Currently, mouseDrag events are used for canvas panning. The (global) variables mouse_drag_(x,y) are set at each mouseDown() and mouseUp() event.

However, mouseDrag() at the moment is not used: The actual panning calculations are done in mouseUp(). We should probably provide visual feedback about the drag amout by redrawing the rulers in this function.

Specified by:

mouseDragged in interface FigCanvas

Overrides:

mouseDragged in class FigBasicCanvas

doZoomIn14

public void doZoomIn14()

zoom in by a factor of sqrt(two). Fixed point is the viewport center.

doZoomOut07

public void doZoomOut07()

doZoomRegionSnapped

public void doZoomRegionSnapped(FigBbox bbox)

doZoomRegionFree

public void doZoomRegionFree(FigBbox bbox)

doZoomRegion

public void doZoomRegion(FigBbox bbox)