//
//  touchTrace.h
//  gestureTest
//
//  Created by Zachry Thayer on 8/14/08.
//  Copyright 2008 A_Nub. All rights reserved.
//

#import <UIKit/UIKit.h>
#import "types.h"

@interface touchTrace : UIView {
	float minDist;//the minimum distance between two points to add it to the tracing
	int pathLen;
	Vert3 *path;//the recorded path
	@private
	bool update;//should this instance be checking for updates
	char touchIndex;//which touch from NSArray?
	NSArray* touchArray;
	CGPoint touch;
}

-(void) touchEndCallback;
-(id)initWithMinDist:(float)dist;
-(void) startTracing; //Tracing is ended when finger is lifted
-(void) endtracing; //end tracing prematurely
-(void) selectTouch:(char)finger;//which object to read from NSArray of touches
-(void) addPointWithX: (float) x andY:(float) y;
-(void) addPoint:(Vert3)point;
-(Vert3*) getPath;//get a pointer to the path of finger
-(int) getPathLen;

//path recording implementation
-(void)touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event;
-(void)touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event;
-(void)touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event;


@end



//
//  touchTrace.m
//  gestureTest
//
//  Created by Zachry Thayer on 8/14/08.
//  Copyright 2008 A_Nub. All rights reserved.
//

#import "touchTrace.h"
#import <OpenGLES/ES1/gl.h>


@implementation touchTrace

-(id)initWithMinDist:(float)dist{
	if((self = [super init])){
		minDist = 10.f;
		pathLen = 0;
		path = NULL;
		touchIndex = 0;
		update = FALSE;
		touchArray = NULL;
	}
	return self;
}

-(void) startTracing{
	update = TRUE;
	if(path != NULL){
		free(path);
		path = NULL;
		pathLen = 0;
	}
}

-(void) endtracing{
	update = FALSE;
}

-(void) selectTouch:(char)finger{
	touchIndex = finger;
}

-(void) addPointWithX: (float) x andY:(float) y{
	pathLen ++;
	if(path == NULL)
		path = (Vert3*)malloc(sizeof(Vert3));
	else
		path = (Vert3*)realloc(path,sizeof(Vert3)*pathLen);

	path[pathLen-1].x = x;
	path[pathLen-1].y = y;
	path[pathLen-1].z = 0;
}

-(void) addPoint:(Vert3)point{
	pathLen ++;
	if(path == NULL)
		path = (Vert3*)malloc(sizeof(Vert3));
	else
		path = (Vert3*)realloc(path,sizeof(Vert3)*pathLen);

	path[pathLen-1].x = point.x;
	path[pathLen-1].y = point.y;
	path[pathLen-1].z = 0;

}

-(Vert3*) getPath{
	return path;
}

-(int) getPathLen{
	return pathLen;
}

-(void) touchesBegan:(NSSet*)touches withEvent:(UIEvent*)event
{
	if(update){
		touchArray = [touches allObjects];
		touch = [[touchArray objectAtIndex:touchIndex] locationInView:self];
		[self addPointWithX:touch.x-160 andY:touch.y-240];
	}
}
#define sqr(i) ((i)*(i))
-(void) touchesMoved:(NSSet*)touches withEvent:(UIEvent*)event
{
	if(update){
		touchArray = [touches allObjects];
		touch = [[touchArray objectAtIndex:touchIndex] locationInView:self];
		//if(sqr(touch.x-path[pathLen].x)+sqr(touch.y-path[pathLen].y) > minDist*minDist)//if we mee our required distance to make a new point
			[self addPointWithX:touch.x-160 andY:touch.y-240];
	}
}

-(void) touchesEnded:(NSSet*)touches withEvent:(UIEvent*)event
{
	if(update){
		[self touchEndCallback];
		update = FALSE;
	}
}


-(void) touchEndCallback{
	//glClearColor(0,1.0f,0,1.0f);
}

@end