// -*- indent-tabs-mode: t; tab-width: 8; c-basic-offset: 4; -*-
// vim: sw=4:ts=8:sts=4
var sys=require("sys");

/*
 * This is configuration for animate module.  For slower or speeder
 * machines, ffs can be decreased or increased respective.
 */
var ffs = 12;
var frame_interval = 1000 / ffs;

function linear_draw() {
    var percent;
    
    percent = (Date.now() - this._start_tm) / this.duration;
    if(percent >= 1) {
	percent = 1;
        if (this.obj.timer) {
	    this.obj.timer.stop();
	    delete this.obj.timer;
	}
    }
    this.obj.x = (this.targetx-this.startposx)*percent+this.startposx;
    this.obj.y = (this.targety-this.startposy)*percent+this.startposy;
    this.app.refresh();
}

function linear_draw_start() {
    var obj = this.obj;
    var self = this;
    
    if(obj.timer)
	obj.timer.stop();

    this._start_tm = Date.now();
    obj.timer = setInterval(function() { self.draw(); }, frame_interval);
}

function linear(app,obj,shiftx,shifty,duration) {
    obj.animated_linear = this;
    this.app = app;
    this.obj = obj;
    this.end = 0;
    this.targetx = shiftx + obj.x;
    this.targety = shifty + obj.y;
    this.startposx = obj.x;
    this.startposy = obj.y;
    this.duration = duration*1000;
}

exports.linear = linear;
linear.prototype.start = linear_draw_start;
linear.prototype.draw = linear_draw;

/* ------------------------------------------------------------ */
function rotate(app, obj, ang, duration) {
    this._app = app;
    this._obj = obj;
    this._ang = ang;
    this._duration = duration * 1000;
}

function rotate_start() {
    var obj = this._obj;
    var self = this;
    
    this._start_mtx = [obj[0], obj[1], obj[2], obj[3], obj[4], obj[5]];
    this._start_tm = Date.now();
    obj.timer = setInterval(function() { self.draw(); }, frame_interval);
}

function rotate_draw() {
    var percent;
    var ang;
    var sv, cv;
    var obj = this._obj;
    var mtx, shift;

    percent = (Date.now() - this._start_tm) / this._duration;
    if(percent >= 1) {
	percent = 1;
	obj.timer.stop();
    }

    ang = percent * this._ang;
    sv = Math.sin(ang);
    cv = Math.cos(ang);
    mtx = [cv, -sv, 0, sv, cv, 0];

    shift = [1, 0, -obj.center.x, 0, 1, -obj.center.y];
    mtx = multiply(mtx, shift);
    shift = [1, 0, obj.center.x, 0, 1, obj.center.y];
    mtx = multiply(shift, mtx);
    mtx = multiply(mtx, this._start_mtx);

    obj[0] = mtx[0];
    obj[1] = mtx[1];
    obj[2] = mtx[2];
    obj[3] = mtx[3];
    obj[4] = mtx[4];
    obj[5] = mtx[5];

    this._app.refresh();
}

rotate.prototype.start = rotate_start;
rotate.prototype.draw = rotate_draw;
exports.rotate = rotate;

function multiply(s,d) {
    var m=[];
    m[0] = s[0]*d[0]+s[1]*d[3];
    m[1] = s[0]*d[1]+s[1]*d[4];
    m[2] = s[0]*d[2]+s[1]*d[5]+s[2];
    m[3] = s[3]*d[0]+s[4]*d[3];
    m[4] = s[3]*d[1]+s[4]*d[4];
    m[5] = s[3]*d[2]+s[4]*d[5]+s[5];
    return m;
}


function scale_draw() {
    if (this.end == 1) return;
    var percent = (Date.now() - this.starttime)/this.duration;
    if (percent > 1) percent = 1;
    var sx = (this.targetx-this.startsx)*percent+this.startsx;
    var sy = (this.targety-this.startsy)*percent+this.startsy;
    var t=[sx,0,0,0,sy,0];
    this.obj[0] = sx;
    this.obj[4] = sy;
    this.obj[2] = this.origin_offset_x - (sx-this.startsx)*this.obj.center.x;
    this.obj[5] = this.origin_offset_y - (sy-this.startsy)*this.obj.center.y;

    this.app.refresh();
    var self = this;
    if (percent < 1) {
	this.obj.timer=setTimeout(function() { self.draw();}, frame_interval);
	return;
    }
    this.app.refresh();
    this.obj.animated_scale = null;
}

function scale(app,obj,targetx,targety, duration) {
    try {
        if (obj.animated_scale) {
	    //obj[0] = obj.animated_scale.targetx;
	    //obj[4] = obj.animated_scale.targety;
	    //obj[2] = obj.animated_scale.final_offset_x;
	    //obj[5] = obj.aninated_scale.final_offset_y;
	    obj.animated_scale.end = 1;
	}
    } catch(e) {
	    
    }
    obj.animated_scale = this;
    this.app = app;
    this.obj = obj;
    this.end = 0;
    this.starttime = Date.now();
    this.startsx = obj[0];
    this.startsy = obj[4];
    this.targetx = targetx;
    this.targety = targety;
    this.duration = duration*1000;
    this.origin_offset_x = obj[2];
    this.origin_offset_y = obj[5];
    this.final_offset_x = this.origin_offset_x-(targetx-this.startsx)*obj.center.x;
    this.final_offset_y = this.origin_offset_y-(targety-this.startsy)*obj.center.y;
}


exports.scale = scale;
scale.prototype.start = scale_draw;
scale.prototype.draw = scale_draw;

function holder(app, coord) {
    var mtx = [coord[0], coord[1], coord[2], coord[3], coord[4], coord[5]];
    
    this._mtx = mtx;
    this._coord = coord;
    this._app = app;
}

holder.prototype = {
    go: function(pos) {
	var sx, sy;

	sx = pos.x - this._coord.center.x;
	sy = pos.y - this._coord.center.y;
	this.shift(sx, sy);
    },

    go_center: function(o) {
	this.go(o.center);
    },
    
    home: function() {
	this._coord[2] = this._mtx[2];
	this._coord[5] = this._mtx[5];
	this._app.refresh();
    },

    shift: function(sx, sy) {
	this._coord[2] = this._mtx[2] + sx;
	this._coord[5] = this._mtx[5] + sy;
	this._app.refresh();
    }
};

exports.holder = holder;



function alpha_draw() {

    if (this.end == 1) return;
    var percent = (Date.now() - this.starttime)/this.duration;
    if (percent > 1) percent = 1;
    var sx = (this.targetalpha-this.startalpha)*percent+this.startalpha;
    this.obj.opacity=sx;

    this.app.refresh();
    var self = this;
    if (percent < 1) {
	this.obj.timer=setTimeout(function() { self.draw();}, frame_interval);
	return;
    }
    this.app.refresh();
    this.obj.animated_alpha = null;
}

function alpha(app,obj,alpha, duration) {
    try {
        if (obj.animated_alpha) {
	    obj.animated_alpha.end = 1;
	}
    } catch(e) {
	    
    }
    obj.animated_alpha = this;
    this.app = app;
    this.obj = obj;
    this.end = 0;
    this.starttime = Date.now();
    this.startalpha = obj.opacity;
    this.targetalpha = alpha;
    this.duration = duration*1000;
}

alpha.prototype.start = alpha_draw;
alpha.prototype.draw = alpha_draw;
exports.alpha = alpha;