//  Scicos
//
//  Copyright (C) INRIA - METALAU Project <scicos@inria.fr>
//
// This program is free software; you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 2 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
//
// See the file ../license.txt
//

function [x,y,typ]=BOUNCE(job,arg1,arg2)
    x=[];
    y=[];
    typ=[];
    select job
    case "set" then
        x=arg1;
        graphics=arg1.graphics;
        exprs=graphics.exprs
        model=arg1.model;
        if size(exprs,"*")<9 then
            exprs(8)="9.81";
            exprs(9)="0";
        end
        while %t do
            [ok,rpar1,rpar2,walls,xt,xd,y,yd,g,C,exprs]=scicos_getvalue(["Set Bounce Block"],..
            ["Mass";"Radius";"[xmin,xmax,ymin,ymax]";"xpos";"xdpos";"ypos";..
            "ydpos";"g (gravity)";"C (aerodynamic coeff"],..
            list("vec",-1,"vec",-1,"vec",-1,"vec",-1,"vec",-1,..
            "vec",-1,"vec",-1,"vec",1,"vec",1),exprs)
            if ~ok then
                break,
            end
            xt=xt(:);
            y=y(:);
            xd=xd(:);
            yd=yd(:);
            rpar1=rpar1(:);
            rpar2=rpar2(:);
            n=size(xt,"*");
            walls=walls(:);
            if walls(1)>walls(2) then
                walls=walls([2,1]);
            end
            if walls(3)>walls(3) then
                walls=walls([3,4]);
            end
            if n<>size(y,"*")|n<>size(rpar1,"*")|n<>size(rpar2,"*")|..
                n<>size(xd,"*")|n<>size(yd,"*") then
                message("All vectors must have equal size")
                ok=%f
            elseif ~(min([rpar1;rpar2])>0) then
                message("Mass and radius must be >0")
                ok=%f
            end
            if ~ok then
                break,
            end
            [model,graphics,ok]=check_io(model,graphics,[],[n,n],[],[])
            if ok then
                k=1;ipar=[];
                for i=1:n
                    for j=i+1:n
                        ipar(k)=i
                        k=k+1
                        ipar(k)=j
                        k=k+1
                    end
                end
                model.rpar=[rpar1;rpar2;walls;g;C];
                model.ipar=ipar;
                state=[xt,xd,y,yd];
                state=state';
                model.state=state(:)
                model.nzcross=n*(n-1)/2+4*n;
                graphics.exprs=exprs;
                x.graphics=graphics;
                x.model=model
                break
            end
        end
    case "define" then
        n=2
        k=1;ipar=[];
        for i=1:n
            for j=i+1:n
                ipar(k)=i
                k=k+1
                ipar(k)=j
                k=k+1
            end
        end
        walls=[0;5;0;5]
        x=[2;2.5];
        xd=[0;0];
        y=[3;5];
        yd=[0;0];
        g=9.81;
        C=0
        rpar1=ones(n,1);
        rpar2=rpar1;
        state=[x,xd,y,yd];
        state=state';
        model=scicos_model()
        model.sim=list("bounce_ball",4)
        model.in=[]
        model.out=[n;n]
        model.state=state(:)
        model.rpar=[rpar1;rpar2;walls;g;C];
        model.ipar=ipar;
        model.nzcross=n*(n-1)/2+4*n;
        model.blocktype="c"
        model.dep_ut=[%f %t]

        exprs=[strcat(sci2exp(rpar1));strcat(sci2exp(rpar2));strcat(sci2exp(walls));strcat(sci2exp(x));strcat(sci2exp(xd));strcat(sci2exp(y));strcat(sci2exp(yd))]
        gr_i=[]
        x=standard_define([3 2],model,exprs,gr_i)
    end
endfunction