/*

    Copyright (C) 2015 Apple Inc. All Rights Reserved.

    See LICENSE.txt for this sample’s licensing information

    Abstract:

    Non-interactive demonstration of path-following behavior.

 */

#import "AAPLPathScene.h"

#import "AAPLAgentNode.h"

@implementation AAPLPathScene

- (NSString *)sceneName {

    return @"FOLLOW PATH";

}

- (void)didMoveToView:(nonnull SKView *)view {

    [super didMoveToView:view];

    AAPLAgentNode *follower = [[AAPLAgentNode alloc] initWithScene:self

                                                          radius:AAPLDefaultAgentRadius

                                                        position:CGPointMake(CGRectGetMidX(self.frame),

                                                                             CGRectGetMidY(self.frame))];

    follower.color = [SKColor cyanColor];

    // A closed path with a few arbitrary points relative to the center of the scene.

    vector_float2 center = { CGRectGetMidX(self.frame), CGRectGetMidY(self.frame) };

    vector_float2 points[10] = {

        { center.x, center.y + 50 },

        { center.x + 50, center.y + 150 },

        { center.x + 100, center.y + 150 },

        { center.x + 200, center.y + 200 },

        { center.x + 350, center.y + 150 },

        { center.x + 300, center.y },

        { center.x, center.y - 200 },

        { center.x - 200, center.y - 100 },

        { center.x - 200, center.y },

        { center.x - 100, center.y + 50 }

    };

    // Create a behavior that makes the agent follow along the path. 

    GKPath *path = [GKPath pathWithPoints:points count:10 radius:AAPLDefaultAgentRadius cyclical:YES];

    follower.agent.behavior = [GKBehavior behaviorWithGoal:[GKGoal goalToFollowPath:path maxPredictionTime:1.5 forward:YES] weight:1];

    [self.agentSystem addComponent:follower.agent];

    // Draw the path.

    CGPoint cgPoints[11];

    for (NSInteger i = 0; i < 10; i++){

        cgPoints[i] = CGPointMake(points[i].x, points[i].y);

    }

    cgPoints[10] = cgPoints[0]; // Repeat the last point to create a closed path.

    SKShapeNode* pathShape = [SKShapeNode shapeNodeWithPoints:cgPoints count:11];

    pathShape.lineWidth = 2;

    pathShape.strokeColor = [SKColor magentaColor];

    [self addChild:pathShape];

}

@end