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

1.1     ! root        1: 
        !             2: /*
        !             3:     ThreeDPanel.m
        !             4: 
        !             5:     ThreeDPanel is a very simple panel for controlling a few attributes of the
        !             6:     3D graphs.  A real app would have a much better UI for controlling 3D
        !             7:     presentation.
        !             8:     
        !             9:     There is only one instance of the panel, which tracks the
        !            10:     setting of the main window.  When a document's window becomes main, it
        !            11:     sends the setCamera: method to the panel, thus keeping it up to date.
        !            12: 
        !            13:     You may freely copy, distribute, and reuse the code in this example.
        !            14:     NeXT disclaims any warranty of any kind, expressed or implied, as to its
        !            15:     fitness for any particular use.
        !            16: */
        !            17: 
        !            18: #import "Graph.h"
        !            19: 
        !            20: /* declare methods private to this class's implementation */
        !            21: @interface ThreeDPanel(Private)
        !            22: - (void)_sendNotification;
        !            23: @end
        !            24: 
        !            25: @implementation ThreeDPanel
        !            26: 
        !            27: /* called when the surface color well changes */
        !            28: - changeSurfaceColor:sender {
        !            29:     [[camera worldShape] setColor:[sender color]];
        !            30:     [camera display];
        !            31:     [self _sendNotification];
        !            32:     return self;
        !            33: }
        !            34: 
        !            35: /* called when the background color well changes */
        !            36: - changeBackgroundColor:sender {
        !            37:     [camera setBackgroundColor:[sender color]];
        !            38:     [camera display];
        !            39:     [self _sendNotification];
        !            40:     return self;
        !            41: }
        !            42: 
        !            43: /* called when shading buttons are changed */
        !            44: - changeShading:sender {
        !            45:     static shadeTable[4] = {N3D_PointCloud, N3D_WireFrame, N3D_FacetedSolids, N3D_SmoothSolids};
        !            46: 
        !            47:   /*
        !            48:    * This message gets the right hidden-surface algorithm for the new type
        !            49:    * of shading.  If you just set the surface type of the individual shapes,
        !            50:    * you can end of with the sides of the objects drawn out of order because
        !            51:    * the correct hider was not chosen.
        !            52:    */
        !            53:     [camera setSurfaceTypeForAll:shadeTable[[shadingButtons selectedRow]] chooseHider:YES];
        !            54:     [camera display];
        !            55:     [self _sendNotification];
        !            56:     return self;
        !            57: }
        !            58: 
        !            59: /*
        !            60:  * Called when the zoom slider is changed.  We just move the eye point along
        !            61:  * its current vector, at a distance given by the slider's value.
        !            62:  */
        !            63: - changeZoom:sender {
        !            64:     RtPoint from, to;
        !            65:     float distance;
        !            66:     float angle;
        !            67:     float newDistance;
        !            68: 
        !            69:     [camera getEyeAt:&from toward:&to roll:&angle];
        !            70:     distance = sqrt(from[0]*from[0] + from[1]*from[1] + from[2]*from[2]);
        !            71:     newDistance = [sender floatValue];
        !            72:     if (newDistance < 0.01)
        !            73:        newDistance = 0.01;
        !            74:     from[0] *= newDistance / distance;
        !            75:     from[1] *= newDistance / distance;
        !            76:     from[2] *= newDistance / distance;
        !            77:     [camera setEyeAt:from toward:to roll:angle];
        !            78: 
        !            79:     [camera display];
        !            80:     [self _sendNotification];
        !            81:     return self;
        !            82: }
        !            83: 
        !            84: /*
        !            85:  * Associates the panel with a new camera view.  Causes the panel's controls
        !            86:  * to adjust to reflect the current settings of the camera and its world shape
        !            87:  * (top level shape).
        !            88:  */
        !            89: - setCamera:obj {
        !            90:     RtPoint fromPoint;
        !            91:     RtPoint toPoint;
        !            92:     float aRollAngle;
        !            93: 
        !            94:     camera = obj;
        !            95:     [surfaceColorWell setEnabled:obj != nil];
        !            96:     [backgroundColorWell setEnabled:obj != nil];
        !            97:     [shadingButtons setEnabled:obj != nil];
        !            98:     [zoomSlider setEnabled:obj != nil];
        !            99:     if (camera) {
        !           100:        [surfaceColorWell setColor:[[camera worldShape] color]];
        !           101:        [backgroundColorWell setColor:[camera backgroundColor]];
        !           102:        switch ([[camera worldShape] surfaceType]) {
        !           103:            case N3D_PointCloud:
        !           104:                [shadingButtons selectCellAt:0 :0];
        !           105:                break;
        !           106:            case N3D_WireFrame:
        !           107:                [shadingButtons selectCellAt:1 :0];
        !           108:                break;
        !           109:            case N3D_FacetedSolids:
        !           110:                [shadingButtons selectCellAt:2 :0];
        !           111:                break;
        !           112:            case N3D_SmoothSolids:
        !           113:                [shadingButtons selectCellAt:3 :0];
        !           114:                break;
        !           115:            default:
        !           116:                NX_ASSERT(NO, "Unexpected shading type in setCamera:");
        !           117:        }
        !           118:        [camera getEyeAt:&fromPoint toward:&toPoint roll:&aRollAngle];
        !           119:        [zoomSlider setFloatValue:sqrt(fromPoint[0]*fromPoint[0] + fromPoint[1]*fromPoint[1] + fromPoint[2]*fromPoint[2])];
        !           120:     }
        !           121:     return self;
        !           122: }
        !           123: 
        !           124: - (void)_sendNotification {
        !           125:     id docDelegate = [[camera window] delegate];
        !           126: 
        !           127:     if ([docDelegate respondsTo:@selector(threeDPanelDidChangeDoc:)]) {
        !           128:        [docDelegate threeDPanelDidChangeDoc:self];
        !           129:     }
        !           130: }
        !           131: 
        !           132: @end
        !           133: 

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