/*

     File: MainController.m

 Abstract: The main controller that handles user interaction.

  Version: 1.1

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 MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION

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 OPERATION ALONE OR IN COMBINATION WITH YOUR PRODUCTS.

 IN NO EVENT SHALL APPLE BE LIABLE FOR ANY SPECIAL, INDIRECT, INCIDENTAL

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 */

#import "MainController.h"

#import "MyOpenGLView.h"

#import "Scene.h"

#import <QuartzCore/QuartzCore.h>

#import <OpenGL/OpenGL.h>

@interface MainController (RotationMethods)

- (BOOL)isRotating;

- (void)startRotation;

- (void)stopRotation;

- (void)toggleRotation;

- (void)startRotationTimer;

- (void)stopRotationTimer;

- (void)rotationTimerFired:(NSTimer *)timer;

@end

@implementation MainController

- (void) awakeFromNib {

    // Make the OpenGL View layer-backed.

    [openGLView setWantsLayer:YES];

    // Show the control box.

    [self toggleControlBox];

    // Start the Earth rotating.

    [self startRotation];

}

- (void)toggleControlBox {

    if ([controlBox superview] != openGLView) {

        // Determine desired start and end positions for animating the controlBox into view.

        NSRect bounds = [openGLView bounds];

        NSPoint endOrigin = NSMakePoint(0.5 * (NSWidth(bounds) - NSWidth([controlBox frame])), 24.0);

        NSPoint startOrigin = NSMakePoint(endOrigin.x, -NSHeight([controlBox frame]));

        // Position the controlBox outside the openGLView's bounds, and make it initially fully transparent.

        [controlBox setFrameOrigin:startOrigin];

        [openGLView addSubview:controlBox];

        [controlBox setAlphaValue:0.0];

        // Now animate the controlBox into view and simultaneously fade it in.

        [NSAnimationContext beginGrouping];

        [[NSAnimationContext currentContext] setDuration:0.5];

        [[controlBox animator] setAlphaValue:1.0];

        [[controlBox animator] setFrameOrigin:endOrigin];

        [NSAnimationContext endGrouping];

    }

    else { //if ([controlBox superview] == openGLView)

        // Remove the controlBox from the view tree.

        [controlBox removeFromSuperview];

    }

}

#pragma mark *** Property Accessors ***

- (BOOL)isFiltered {

    return filter != nil;

}

- (void)setFiltered:(BOOL)flag {

    if (flag != [self isFiltered]) {

        if (flag) {

            // Instantiate a Core Image "Glass Distortion" filter.

            filter = [CIFilter filterWithName:@"CIGlassDistortion"];

            [filter setDefaults];

            CIImage *glassImage = [CIImage imageWithData:[NSData dataWithContentsOfFile:[[NSBundle mainBundle] pathForImageResource:@"smoothtexture"]]];

            [filter setValue:glassImage forKey:@"inputTexture"];

            // Apply the glass distortion to filter the openGLView content that's rendered behind the controlBox.

            [[controlBox animator] setBackgroundFilters:[NSArray arrayWithObject:filter]];

        } else {

            // Remove the filter and discard our pointer to it.

            [[controlBox animator] setBackgroundFilters:nil];

            filter = nil;

        }

    }

}

#pragma mark *** Event Handling ***

- (void)keyDown:(NSEvent *)event {

    Scene *scene = [openGLView scene];

    unichar c = [[event charactersIgnoringModifiers] characterAtIndex:0];

    switch (c) {

        // [space] toggles rotation of the globe.

        case 32:

            [self toggleRotation];

            break;

        // [W] toggles wireframe rendering

        case 'w':

        case 'W':

            [scene toggleWireframe];

            [openGLView setNeedsDisplay:YES];

            break;

        // [C] toggle displaying the control box

        case 'c':

        case 'C':

            [self toggleControlBox];

            break;

        default:

            break;

    }

}

// Holding the mouse button and dragging the mouse changes the "roll" angle (y-axis) and the direction from which sunlight is coming (x-axis).

- (void)mouseDown:(NSEvent *)theEvent {

    Scene *scene = [openGLView scene];

    BOOL wasAnimating = [self isRotating];

    BOOL dragging = YES;

    NSPoint windowPoint;

    NSPoint lastWindowPoint = [theEvent locationInWindow];

    float dx, dy;

    if (wasAnimating) {

        [self stopRotation];

    }

    while (dragging) {

        theEvent = [[openGLView window] nextEventMatchingMask:NSLeftMouseUpMask | NSLeftMouseDraggedMask];

        windowPoint = [theEvent locationInWindow];

        switch ([theEvent type]) {

            case NSLeftMouseUp:

                dragging = NO;

                break;

            case NSLeftMouseDragged:

                dx = windowPoint.x - lastWindowPoint.x;

                dy = windowPoint.y - lastWindowPoint.y;

                [scene setSunAngle:[scene sunAngle] - 1.0 * dx];

                [scene setRollAngle:[scene rollAngle] - 0.5 * dy];

                lastWindowPoint = windowPoint;

                // Render a frame.

                [openGLView setNeedsDisplay:YES];

                break;

            default:

                break;

        }

    }

    if (wasAnimating) {

        [self startRotation];

        timeBefore = CFAbsoluteTimeGetCurrent();

    }

}

@end

@implementation MainController (RotationMethods)

- (BOOL)isRotating {

    return isRotating;

}

- (void)startRotation {

    if (!isRotating) {

        isRotating = YES;

        [self startRotationTimer];

    }

}

- (void)stopRotation {

    if (isRotating) {

        if (rotationTimer != nil) {

            [self stopRotationTimer];

        }

        isRotating = NO;

    }

}

- (void)toggleRotation {

    if ([self isRotating]) {

        [self stopRotation];

    } else {

        [self startRotation];

    }

}

- (void)startRotationTimer {

    if (rotationTimer == nil) {

        rotationTimer = [[NSTimer scheduledTimerWithTimeInterval:0.017 target:self selector:@selector(rotationTimerFired:) userInfo:nil repeats:YES] retain];

    }

}

- (void)stopRotationTimer {

    if (rotationTimer != nil) {

        [rotationTimer invalidate];

        [rotationTimer release];

        rotationTimer = nil;

    }

}

- (void)rotationTimerFired:(NSTimer *)timer {

    Scene *scene = [openGLView scene];

    [scene advanceTimeBy:0.017];

    [openGLView setNeedsDisplay:YES];

}

@end