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Annotation of Examples/AppKit/Graph/RotatorCamera.m, revision 1.1

1.1     ! root        1: 
        !             2: /*
        !             3:     RotatorCamera.m
        !             4: 
        !             5:     RotatorCamera is an N3DCamera that tracks the mouse to rotate the
        !             6:     contents of the camera using a N3DRotator.
        !             7: 
        !             8:     You may freely copy, distribute, and reuse the code in this example.
        !             9:     NeXT disclaims any warranty of any kind, expressed or implied, as to its
        !            10:     fitness for any particular use.
        !            11: */
        !            12: 
        !            13: #import "Graph.h"
        !            14: 
        !            15: #define MOUSE_MASK (NX_LMOUSEDOWNMASK|NX_LMOUSEDRAGGEDMASK|NX_LMOUSEUPMASK)
        !            16: 
        !            17: @implementation RotatorCamera
        !            18: 
        !            19: /*
        !            20:  * As we track the mouse, we use a N3DRotator object to calculate the new
        !            21:  * viewing transforms, and then apply those to the camera's world shape.
        !            22:  * If our window's delegate is interested, we notify it that we've changed
        !            23:  * the document.
        !            24:  */
        !            25: - mouseDown:(NXEvent *)event {
        !            26:     N3DRotator *rotator = [[N3DRotator allocFromZone:[self zone]] initWithCamera:self];
        !            27:     RtMatrix rotationXForm;
        !            28:     RtMatrix inverseRotationXForm;
        !            29:     NXEvent newEvent;
        !            30:     NXPoint oldLocation, newLocation;
        !            31: 
        !            32:     oldLocation = event->location;
        !            33:     [self convertPoint:&oldLocation fromView:nil];
        !            34:     [window addToEventMask:NX_LMOUSEDRAGGEDMASK];
        !            35:     do {
        !            36:        newEvent = *[NXApp getNextEvent:MOUSE_MASK];
        !            37:        newLocation = newEvent.location;
        !            38:        [self convertPoint:&newLocation fromView:nil];
        !            39:        if (oldLocation.x != newLocation.x || oldLocation.y != newLocation.y) {
        !            40:            [rotator trackMouseFrom:&oldLocation to:&newLocation
        !            41:                rotationMatrix:rotationXForm andInverse:inverseRotationXForm];
        !            42:            [worldShape concatTransformMatrix:rotationXForm premultiply:NO];
        !            43:            [self display];
        !            44:            if ([[window delegate] respondsTo:@selector(docChanged)])
        !            45:                [[window delegate] docChanged];
        !            46:        }
        !            47:        oldLocation = newLocation;
        !            48:     } while (newEvent.type != NX_LMOUSEDOWN && newEvent.type != NX_LMOUSEUP);
        !            49:     [rotator free];
        !            50:     return self;
        !            51: }
        !            52: 
        !            53: @end

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