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Annotation of Examples/AppKit/BackspaceViews/SlidingImage/SlidingImageView.m, revision 1.1

1.1     ! root        1: //
        !             2: //  SlidingImageView.m
        !             3: //
        !             4: //  Implements a sliding image screen saver view.
        !             5: //
        !             6: //  Lennart Lovstrand, August 1991.
        !             7: //     small modifications by sam 910904
        !             8: //
        !             9: //  You may freely copy, distribute, and reuse the code in this example.
        !            10: //  NeXT disclaims any warranty of any kind, expressed or  implied, as to its
        !            11: //  fitness for any particular use.
        !            12: 
        !            13: #import "SlidingImageView.h"
        !            14: #import "Thinker.h"
        !            15: #import <appkit/NXImage.h>
        !            16: #import <appkit/Panel.h>               // for NXRunAlertPanel()
        !            17: #import <dpsclient/wraps.h>
        !            18: #import <libc.h>
        !            19: #import <math.h>
        !            20: 
        !            21: @implementation SlidingImageView
        !            22: 
        !            23: - drawSelf:(const NXRect *)rects :(int)rectCount
        !            24: {
        !            25:        NXPoint p;
        !            26:        if (!rects || !rectCount) return self;
        !            27: 
        !            28:        [super drawSelf:rects :rectCount];
        !            29:        
        !            30:        p.x = floor(imageRect.origin.x);
        !            31:        p.y = floor(imageRect.origin.y);
        !            32: 
        !            33:     [image composite: NX_SOVER toPoint: &p];
        !            34: 
        !            35:        return self;
        !            36: }
        !            37: 
        !            38: - oneStep
        !            39: {
        !            40:        NXPoint p;
        !            41:     PSsetgray(0);
        !            42:     NXRectFill(&imageRect);
        !            43:     
        !            44:        usleep((1*1000000)/68);                                 //sleep a few vblanks
        !            45:     imageRect.origin.x += delta.x;
        !            46:     imageRect.origin.y += delta.y;
        !            47: 
        !            48:     if (imageRect.origin.x < 0)
        !            49:        {
        !            50:                imageRect.origin.x = 0;
        !            51:                delta.x = randBetween(.8,1.3);
        !            52:     }
        !            53:        else if (imageRect.origin.x > maxCoord.x)
        !            54:        {
        !            55:                imageRect.origin.x = maxCoord.x;
        !            56:                delta.x = -randBetween(.8,1.3);
        !            57:     }
        !            58: 
        !            59:     if (imageRect.origin.y < 0)
        !            60:        {
        !            61:                imageRect.origin.y = 0;
        !            62:                delta.y = randBetween(.8,1.3);
        !            63:     }
        !            64:        else if (imageRect.origin.y > maxCoord.y)
        !            65:        {
        !            66:                imageRect.origin.y = maxCoord.y;
        !            67:                delta.y = -randBetween(.8,1.3);
        !            68:     }
        !            69: 
        !            70:        p.x = floor(imageRect.origin.x);
        !            71:        p.y = floor(imageRect.origin.y);
        !            72: 
        !            73:     [image composite: NX_SOVER toPoint: &p];
        !            74: 
        !            75:     return self;
        !            76: }
        !            77: 
        !            78: - setImageConstraints
        !            79: {
        !            80:     [super setImageConstraints];
        !            81: 
        !            82:        if (imageRect.origin.x > maxCoord.x ||
        !            83:                imageRect.origin.y > maxCoord.y)
        !            84:        {
        !            85:                imageRect.origin.x = randBetween(0, maxCoord.x);
        !            86:                imageRect.origin.y = randBetween(0, maxCoord.y);
        !            87:        }
        !            88: 
        !            89:        delta.x = randBetween(-1,1);
        !            90:        delta.y = randBetween(-1,1);
        !            91: 
        !            92:     return self;
        !            93: }
        !            94: 
        !            95: - inspector:sender
        !            96: {
        !            97:        return [sender commonImageInspector];
        !            98: }
        !            99: 
        !           100: @end

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