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A simple finger trail extension for Sparrow
//
// SHFingerTrail.h
// FingerTrailSample
//
// Created by Shilo White on 3/28/11.
// Copyright 2011 Shilocity Productions. All rights reserved.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the Simplified BSD License.
//
typedef enum {
SHFingerTrailStyleSpiky,
SHFingerTrailStyleBubbly,
SHFingerTrailStyleSlinky,
} SHFingerTrailStyle;
#import <Foundation/Foundation.h>
#import "SPSprite.h"
@class SPJuggler;
@interface SHFingerTrail : SPSprite {
SPJuggler *mJuggler;
SHFingerTrailStyle mStyle;
float mTime;
float mSize;
int mMaxNumberOfFingers;
BOOL mAlwaysOnTop;
BOOL mShowOnTouchBegin;
BOOL mFade;
uint mInnerColor;
uint mOuterColor;
float mGradient[12];
}
@property (nonatomic, assign) SHFingerTrailStyle style;
@property (nonatomic, assign) float time;
@property (nonatomic, assign) float size;
@property (nonatomic, assign) BOOL alwaysOnTop;
@property (nonatomic, assign) BOOL showOnTouchBegin;
@property (nonatomic, assign) BOOL fade;
@property (nonatomic, assign) uint color;
@property (nonatomic, assign) uint innerColor;
@property (nonatomic, assign) uint outerColor;
- (id)initWithTime:(float)time;
- (id)initWithTime:(float)time size:(float)size;
+ (SHFingerTrail *)fingerTrail;
+ (SHFingerTrail *)fingerTrailWithTime:(float)time;
+ (SHFingerTrail *)fingerTrailWithTime:(float)time size:(float)size;
@end
//
// SHFingerTrail.m
// FingerTrailSample
//
// Created by Shilo White on 3/28/11.
// Copyright 2011 Shilocity Productions. All rights reserved.
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the Simplified BSD License.
//
#define SP_COLOR_PART_RED(color) (((color) >> 16) & 0xff)
#define SP_COLOR_PART_GREEN(color) (((color) >> 8) & 0xff)
#define SP_COLOR_PART_BLUE(color) ( (color) & 0xff)
#import "SHFingerTrail.h"
#import "SPTouchEvent.h"
#import "SPEnterFrameEvent.h"
#import "SPPoint.h"
#import "SPTween.h"
#import "SPJuggler.h"
#import "SPStage.h"
#import "SPTexture.h"
#import "SPImage.h"
#import "SPDisplayObjectContainer.h"
@interface SHFingerTrail ()
- (void)setGradient;
- (void)drawTrailWithCurrentLocation:(SPPoint *)currentLocation previousLocation:(SPPoint *)previousLocation;
- (void)startTweenWithTrail:(SPSprite *)target distance:(float)distance;
@end
@implementation SHFingerTrail
@synthesize style = mStyle;
@synthesize time = mTime;
@synthesize size = mSize;
@synthesize alwaysOnTop = mAlwaysOnTop;
@synthesize showOnTouchBegin = mShowOnTouchBegin;
@synthesize fade = mFade;
@synthesize innerColor = mInnerColor;
@synthesize outerColor = mOuterColor;
- (id)init {
return [self initWithTime:0.2f];
}
- (id)initWithTime:(float)time {
return [self initWithTime:time size:30.0f];
}
- (id)initWithTime:(float)time size:(float)size {
if (self = [super init]) {
mStyle = SHFingerTrailStyleSpiky;
mTime = time;
mSize = size;
mInnerColor = 0xadd8e6;
mOuterColor = 0x0000ff;
[self setGradient];
[self addEventListener:@selector(onAddedToStage:) atObject:self forType:SP_EVENT_TYPE_ADDED_TO_STAGE];
[self addEventListener:@selector(onRemovedFromStage:) atObject:self forType:SP_EVENT_TYPE_REMOVED_FROM_STAGE];
}
return self;
}
+ (SHFingerTrail *)fingerTrail {
return [[[SHFingerTrail alloc] init] autorelease];
}
+ (SHFingerTrail *)fingerTrailWithTime:(float)time {
return [[[SHFingerTrail alloc] initWithTime:time] autorelease];
}
+ (SHFingerTrail *)fingerTrailWithTime:(float)time size:(float)size {
return [[[SHFingerTrail alloc] initWithTime:time size:size] autorelease];
}
- (void)setInnerColor:(uint)innerColor {
if (innerColor != mInnerColor) {
mInnerColor = innerColor;
[self setGradient];
}
}
- (void)setOuterColor:(uint)outerColor {
if (outerColor != mOuterColor) {
mOuterColor = outerColor;
[self setGradient];
}
}
- (void)setColor:(uint)color {
mInnerColor = mOuterColor = color;
[self setGradient];
}
- (uint)color {
return mInnerColor;
}
- (void)setAlwaysOnTop:(BOOL)alwaysOnTop {
if (alwaysOnTop != mAlwaysOnTop) {
mAlwaysOnTop = alwaysOnTop;
if (mAlwaysOnTop) [self addEventListener:@selector(checkOnTop:) atObject:self forType:SP_EVENT_TYPE_ENTER_FRAME];
else [self removeEventListener:@selector(checkOnTop:) atObject:self forType:SP_EVENT_TYPE_ENTER_FRAME];
}
}
- (void)checkOnTop:(SPEnterFrameEvent *)event {
SPDisplayObjectContainer *parent = self.parent;
if ([parent childIndex:self] < parent.numChildren-1) [parent addChild:self];
}
- (void)onAddedToStage:(SPEvent *)event {
[self.stage addEventListener:@selector(onTouch:) atObject:self forType:SP_EVENT_TYPE_TOUCH];
SPStage *stage = (SPStage *)self.stage;
mJuggler = stage.juggler;
}
- (void)onRemovedFromStage:(SPEvent *)event {
[self.stage removeEventListener:@selector(onTouch:) atObject:self forType:SP_EVENT_TYPE_TOUCH];
mJuggler = nil;
}
- (void)onTouch:(SPTouchEvent *)event {
NSArray *touches = [[event touches] allObjects];
for (SPTouch *touch in touches) {
if (touch.phase == SPTouchPhaseBegan && mShowOnTouchBegin || touch.phase == SPTouchPhaseMoved) {
[self drawTrailWithCurrentLocation:[touch locationInSpace:self] previousLocation:[touch previousLocationInSpace:self]];
}
}
}
- (void)setGradient {
mGradient[0] = SP_COLOR_PART_RED(mOuterColor);
mGradient[1] = SP_COLOR_PART_GREEN(mOuterColor);
mGradient[2] = SP_COLOR_PART_BLUE(mOuterColor);
mGradient[3] = 1.0f;
mGradient[4] = SP_COLOR_PART_RED(mInnerColor);
mGradient[5] = SP_COLOR_PART_GREEN(mInnerColor);
mGradient[6] = SP_COLOR_PART_BLUE(mOuterColor);
mGradient[7] = 1.0f;
mGradient[8] = SP_COLOR_PART_RED(mOuterColor);
mGradient[9] = SP_COLOR_PART_GREEN(mOuterColor);
mGradient[10] = SP_COLOR_PART_BLUE(mOuterColor);
mGradient[11] = 1.0f;
}
- (void)drawTrailWithCurrentLocation:(SPPoint *)currentLocation previousLocation:(SPPoint *)previousLocation {
float radius = mSize/2;
float distance = [SPPoint distanceFromPoint:previousLocation toPoint:currentLocation];
SPTexture *trailTexture = [[SPTexture alloc] initWithWidth:mSize height:distance+mSize
draw:^(CGContextRef context) {
CGContextBeginTransparencyLayer(context, NULL);
CGContextSetLineWidth(context, mSize);
CGContextSetLineCap(context, kCGLineCapRound);
CGContextMoveToPoint(context, radius, radius);
CGContextAddLineToPoint(context, radius, distance+radius);
CGContextStrokePath(context);
CGContextSetBlendMode(context, kCGBlendModeSourceIn);
CGColorSpaceRef baseSpace = CGColorSpaceCreateDeviceRGB();
CGGradientRef gradient = CGGradientCreateWithColorComponents(baseSpace, mGradient, NULL, 3);
CGColorSpaceRelease(baseSpace);
baseSpace = NULL;
CGContextDrawLinearGradient(context, gradient, CGPointMake(0, (distance+mSize)/2), CGPointMake(mSize, (distance+mSize)/2), 0);
CGGradientRelease(gradient);
gradient = NULL;
CGContextEndTransparencyLayer(context);
}];
SPImage *trailImage = [[SPImage alloc] initWithTexture:trailTexture];
trailImage.x = -ceil(radius);
trailImage.y = -ceil(radius);
SPSprite *trailSprite = [[SPSprite alloc] init];
trailSprite.x = currentLocation.x;
trailSprite.y = currentLocation.y;
trailSprite.rotation = atan2(currentLocation.x-previousLocation.x, previousLocation.y-currentLocation.y);
[trailSprite addChild:trailImage];
[self addChild:trailSprite];
[self startTweenWithTrail:trailSprite distance:distance];
[trailSprite release];
[trailImage release];
[trailTexture release];
}
- (void)startTweenWithTrail:(SPSprite *)target distance:(float)distance {
SPTween *tween = [SPTween tweenWithTarget:target time:mTime];
switch (mStyle) {
case SHFingerTrailStyleSpiky:
[tween animateProperty:@"scaleX" targetValue:0];
if (distance < 5) [tween animateProperty:@"scaleY" targetValue:0];
break;
case SHFingerTrailStyleBubbly:
[tween animateProperty:@"scaleX" targetValue:0];
[tween animateProperty:@"scaleY" targetValue:0];
break;
case SHFingerTrailStyleSlinky:
[tween animateProperty:@"scaleY" targetValue:0];
break;
}
if (mFade) [tween animateProperty:@"alpha" targetValue:0];
[tween addEventListener:@selector(onTweenCompleted:) atObject:self forType:SP_EVENT_TYPE_TWEEN_COMPLETED];
[mJuggler addObject:tween];
}
- (void)onTweenCompleted:(SPEvent *)event {
SPTween *tween = (SPTween *)event.target;
[tween removeEventListener:@selector(onTweenCompleted:) atObject:self forType:SP_EVENT_TYPE_TWEEN_COMPLETED];
[self removeChild:(SPDisplayObject *)tween.target];
}
@end
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