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Annotation of Examples/AppKit/Draw/Circle.m, revision 1.1

1.1     ! root        1: #import "draw.h"
        !             2: 
        !             3: /*
        !             4:  * This line is just a stub to get genstrings to generate
        !             5:  * a .strings file entry for the name of this type of Graphic.
        !             6:  * The name is used in the Undo New <Whatever> menu item.
        !             7:  *
        !             8:  * NXLocalString("Circle", NULL, "Name of the tool that draws ovals, i.e., the %s of the New %s operation.")
        !             9:  */
        !            10: 
        !            11: @implementation Circle : Graphic
        !            12: 
        !            13: + initialize
        !            14: /*
        !            15:  * This bumps the class version so that we can compatibly read
        !            16:  * old Graphic objects out of an archive.
        !            17:  */
        !            18: {
        !            19:     [Circle setVersion:1];
        !            20:     return self;
        !            21: }
        !            22: 
        !            23: - (Graphic *)colorAcceptorAt:(const NXPoint *)point
        !            24: /*
        !            25:  * An oval accepts a dropped color if the drop occurs
        !            26:  * within the bounds of the circle itself.
        !            27:  */
        !            28: {
        !            29:     if ([self hit:point]) return self;
        !            30:     return nil;
        !            31: }
        !            32: 
        !            33: - (float)naturalAspectRatio
        !            34: /*
        !            35:  * The natural aspect ratio of an oval is 1.0 (a circle).
        !            36:  */
        !            37: {
        !            38:     return 1.0;
        !            39: }
        !            40: 
        !            41: - draw
        !            42: {
        !            43:     if (bounds.size.width < 1.0 || bounds.size.height < 1.0) return self;
        !            44: 
        !            45:     if ([self fill]) {
        !            46:        PSgsave();
        !            47:        [self setFillColor];
        !            48:        PSFilledOval(bounds.origin.x, bounds.origin.y, bounds.size.width, bounds.size.height);
        !            49:        PSgrestore();
        !            50:     }
        !            51:     if (!gFlags.nooutline) {
        !            52:        [self setLineColor];
        !            53:        PSFramedOval(bounds.origin.x, bounds.origin.y, bounds.size.width, bounds.size.height);
        !            54:     }
        !            55: 
        !            56:     return self;
        !            57: }
        !            58: 
        !            59: - (BOOL)hit:(const NXPoint *)p
        !            60: /*
        !            61:  * Hit only if inside the interior of the oval.
        !            62:  */
        !            63: {
        !            64:     NXCoord x, y;
        !            65:     NXPoint center;
        !            66:     double angle, radius, diameter;
        !            67: 
        !            68:     if ([super hit:p]) {
        !            69:        center.x = bounds.origin.x + bounds.size.width / 2.0;
        !            70:        center.y = bounds.origin.y + bounds.size.height / 2.0;
        !            71:        diameter = MIN(bounds.size.width, bounds.size.height);
        !            72:        x = fabs(center.x - p->x) / (bounds.size.width / diameter);
        !            73:        y = fabs(center.y - p->y) / (bounds.size.height / diameter);
        !            74:        angle = atan2(y, x);
        !            75:        radius = diameter / 2.0;
        !            76:        return(x < radius * cos(angle) && y < radius * sin(angle));
        !            77:     } else {
        !            78:        return NO;
        !            79:     }
        !            80: }
        !            81: 
        !            82: 
        !            83: @end
        !            84: 

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