/*

     File: ASCSlideCamera.m

 Abstract: Camera slide. Illustrates the camera node attribute.

  Version: 1.1

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#import "ASCPresentationViewController.h"

#import "ASCSlideTextManager.h"

#import "ASCSlide.h"

#import "Utils.h"

@interface ASCSlideCamera : ASCSlide

@end

@implementation ASCSlideCamera

- (NSUInteger)numberOfSteps {

    return 9;

}

- (void)setupSlideWithPresentationViewController:(ASCPresentationViewController *)presentationViewController {

    // Create a node to own the "sign" model, make it to be close to the camera, rotate by 90 degree because it's oriented with z as the up axis

    SCNNode *intermediateNode = [SCNNode node];

    intermediateNode.position = SCNVector3Make(0, 0, 7);

    intermediateNode.rotation = SCNVector4Make(1, 0, 0, -M_PI_2);

    [self.groundNode addChildNode:intermediateNode];

    // Load the "sign" model

    SCNNode *signNode = [intermediateNode asc_addChildNodeNamed:@"sign" fromSceneNamed:@"intersection" withScale:30];

    signNode.position = SCNVector3Make(4, -2, 0.05);

    // Re-parent every node that holds a camera otherwise they would inherit the scale from the "sign" model.

    // This is not a problem except that the scale affects the zRange of cameras and so it would be harder to get the transition from one camera to another right

    NSArray *cameraNodes = [signNode childNodesPassingTest:^BOOL(SCNNode *child, BOOL *stop) {

        return (child.camera != nil);

    }];

    for (SCNNode *cameraNode in cameraNodes) {

        CATransform3D previousWorldTransform = cameraNode.worldTransform;

        [intermediateNode addChildNode:cameraNode]; // re-parent

        cameraNode.transform = [intermediateNode convertTransform:previousWorldTransform fromNode:nil];

        cameraNode.scale = SCNVector3Make(1, 1, 1);

    }

}

- (void)presentStepIndex:(NSUInteger)index withPresentionViewController:(ASCPresentationViewController *)presentationViewController {

    [SCNTransaction begin];

    switch (index) {

        case 0:

        {

            // Set the slide's title and subtitle and add some text

            self.textManager.title = @"Node Attributes";

            self.textManager.subtitle = @"Camera";

            [self.textManager addBullet:@"Point of view for renderers" atLevel:0];

            // Start with the "sign" model hidden

            SCNNode *group = [self.contentNode childNodeWithName:@"group" recursively:YES];

            group.scale = SCNVector3Make(0, 0, 0);

            group.hidden = YES;

            break;

        }

        case 1:

        {

            // Reveal the model (unhide then scale)

            SCNNode *group = [self.contentNode childNodeWithName:@"group" recursively:YES];

            [SCNTransaction begin];

            [SCNTransaction setAnimationDuration:0];

            {

                group.hidden = NO;

            }

            [SCNTransaction commit];

            [SCNTransaction setAnimationDuration:1.0];

            group.scale = SCNVector3Make(1, 1, 1);

            break;

        }

        case 2:

            [self.textManager addCode:

             @"aNode.#camera# = [#SCNCamera# camera]; \n"

             @"aView.#pointOfView# = aNode;"];

            break;

        case 3:

            // Switch to camera1

            [SCNTransaction setAnimationDuration:2.0];

            presentationViewController.view.pointOfView = [self.contentNode childNodeWithName:@"camera1" recursively:YES];

            break;

        case 4:

            // Switch to camera2

            [SCNTransaction setAnimationDuration:2.0];

            presentationViewController.view.pointOfView = [self.contentNode childNodeWithName:@"camera2" recursively:YES];

            break;

        case 5:

        {

            // On completion add some code

            [SCNTransaction setCompletionBlock:^{

                self.textManager.fadesIn = YES;

                [self.textManager addEmptyLine];

                [self.textManager addCode:@"aNode.#camera#.xFov = angleInDegrees;"];

            }];

            // Switch back to the default camera

            [SCNTransaction setAnimationDuration:1.0];

            presentationViewController.view.pointOfView = presentationViewController.cameraNode;

            break;

        }

        case 6:

        {

            // Switch to camera 3

            [SCNTransaction setAnimationDuration:1.0];

            SCNNode *target = [self.contentNode childNodeWithName:@"camera3" recursively:YES];

            // Don't let the default transition animate the FOV (we will animate the FOV separately)

            double wantedFOV = target.camera.xFov;

            target.camera.xFov = presentationViewController.view.pointOfView.camera.xFov;

            // Animate point of view with an ease-in/ease-out function

            [SCNTransaction begin];

            [SCNTransaction setAnimationDuration:1.0];

            [SCNTransaction setAnimationTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

            {

                presentationViewController.view.pointOfView = target;

            }

            [SCNTransaction commit];

            // Animate the FOV with the default timing function (for a better looking transition)

            [SCNTransaction begin];

            [SCNTransaction setAnimationDuration:1.0];

            {

                presentationViewController.view.pointOfView.camera.xFov = wantedFOV;

            }

            [SCNTransaction commit];

            break;

        }

        case 7:

        {

            // Switch to camera 4

            SCNNode *cameraNode = [self.contentNode childNodeWithName:@"camera4" recursively:YES];

             // Don't let the default transition animate the FOV (we will animate the FOV separately)

            double wantedFOV = cameraNode.camera.xFov;

            cameraNode.camera.xFov = presentationViewController.view.pointOfView.camera.xFov;

            // Animate point of view with the default timing function

            [SCNTransaction begin];

            [SCNTransaction setAnimationDuration:1.0];

            {

                presentationViewController.view.pointOfView = cameraNode;

            }

            [SCNTransaction commit];

            // Animate the FOV with an ease-in/ease-out function

            [SCNTransaction begin];

            [SCNTransaction setAnimationDuration:1.0];

            [SCNTransaction setAnimationTimingFunction:[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseInEaseOut]];

            {

                presentationViewController.view.pointOfView.camera.xFov = wantedFOV;

            }

            [SCNTransaction commit];

            break;

        }

        case 8:

        {

            // Quickly switch back to the default camera

            [SCNTransaction begin];

            [SCNTransaction setAnimationDuration:0.75];

            {

                presentationViewController.view.pointOfView = presentationViewController.cameraNode;

            }

            [SCNTransaction commit];

            break;

        }

    }

    [SCNTransaction commit];

}

- (void)willOrderOutWithPresentionViewController:(ASCPresentationViewController *)presentationViewController {

    [SCNTransaction begin];

    {

        // Restore the default point of view before leaving this slide

        presentationViewController.view.pointOfView = presentationViewController.cameraNode;

    }

    [SCNTransaction commit];

}

@end