/*

 File: RocketView.m

 Abstract: Displays the game's graphics.

 Version: 1.0

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 */

#import "RocketView.h"

#define kFlameOffset 5.0

#define kFlameLength 8.0

@implementation RocketView

- (id)initWithFrame:(CGRect)frame {

    if (self = [super initWithFrame:frame]) {

        playerImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"bluerocket.png"]];

        enemyImage = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"redrocket.png"]];

        [self addSubview:playerImage];

        [self addSubview:enemyImage];

        playerFrame.size = CGSizeMake(kSize,kSize*kRocketHeightRatio);

        enemyFrame.size = CGSizeMake(kSize,kSize*kRocketHeightRatio);

        ball.size = CGSizeMake(kSize,kSize);

        ballHue = 0.0;

        [self newBall];

    }

    return self;

}

- (void)dealloc {

    [ballColor release];

    [playerImage release];

    [enemyImage release];

    [super dealloc];

}

// Creates a ball of a new color to indicate a new round of play.

- (void)newBall

{

    [ballColor release];

    ballColor = [[UIColor alloc] initWithHue:ballHue saturation:0.5 brightness:1.0 alpha:1.0];

    ballHue+=0.3;

    if (ballHue > 1.0) ballHue-=1.0;

}

// Called to update the positions of objects that will be drawn on screen.

- (void)updatePlayer:(CGRect)newPlayer enemy:(CGRect)newEnemy ball:(CGRect)newBall playerThrust:(Float32) pThrust enemyThrust:(Float32) eThrust

{

    [self setNeedsDisplay];

    playerFrame = newPlayer;

    enemyFrame = newEnemy;

    ball = newBall;

    // Move the sprites to the right spot.

    playerImage.center = CGPointMake(CGRectGetMidX(playerFrame),CGRectGetMidY(playerFrame)-2.0);

    enemyImage.center = CGPointMake(CGRectGetMidX(enemyFrame),CGRectGetMidY(enemyFrame)-2.0);

    // Figure out how long the flames need to be.

    playerThrust = pThrust > 0.0 ? pThrust*kFlameLength : 0.0;

    enemyThrust = eThrust > 0.0 ? eThrust*kFlameLength : 0.0;

}

// Redraw when there has been an update.

- (void)drawRect:(CGRect)rect {

    // Blank the background.

    CGContextRef context = UIGraphicsGetCurrentContext();

    [[UIColor blackColor] set];

    UIRectFill(rect);

    // Draw the ball.

    [ballColor set];

    CGContextFillEllipseInRect(context, ball);

    // Draw the flames on the rockets.

    // The flames serve as a VU meter, showing the current loudness of each player.

    [[UIColor yellowColor] set];

    CGContextMoveToPoint(context, CGRectGetMinX(playerFrame)+kFlameOffset, CGRectGetMaxY(playerFrame));

    CGContextAddLineToPoint(context, CGRectGetMaxX(playerFrame)-kFlameOffset, CGRectGetMaxY(playerFrame));

    CGContextAddLineToPoint(context, CGRectGetMidX(playerFrame), CGRectGetMaxY(playerFrame)+playerThrust);

    CGContextFillPath(context);

    CGContextMoveToPoint(context, CGRectGetMinX(enemyFrame)+kFlameOffset, CGRectGetMaxY(enemyFrame));

    CGContextAddLineToPoint(context, CGRectGetMaxX(enemyFrame)-kFlameOffset, CGRectGetMaxY(enemyFrame));

    CGContextAddLineToPoint(context, CGRectGetMidX(enemyFrame), CGRectGetMaxY(enemyFrame)+enemyThrust);

    CGContextFillPath(context);

}

@end