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<!DOCTYPE html>
<html lang="en">
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<meta charset="UTF-8">
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<pre id="content">
<a name="l1"></a><span class=cF0>#</span><span class=cF1>define</span><span class=cF0> BALLS_NUM 7
<a name="l2"></a>#</span><span class=cF1>define</span><span class=cF0> SPRINGS_NUM 3
<a name="l3"></a>
<a name="l4"></a>#</span><span class=cF1>define</span><span class=cF0> STRETCH 500.0
<a name="l5"></a>#</span><span class=cF1>define</span><span class=cF0> GRAVITY 50.0 </span><span class=cF2>//not really gravity</span><span class=cF0>
<a name="l6"></a>#</span><span class=cF1>define</span><span class=cF0> BALL_RADIUS 5
<a name="l7"></a>#</span><span class=cF1>define</span><span class=cF0> BASE_SIZE 10
<a name="l8"></a>
<a name="l9"></a></span><span class=cF9>CMass</span><span class=cF0> balls[BALLS_NUM];
<a name="l10"></a></span><span class=cF9>CSpring</span><span class=cF0> springs[SPRINGS_NUM];
<a name="l11"></a></span><span class=cF1>F64</span><span class=cF0> collision_t;
<a name="l12"></a>
<a name="l13"></a></span><span class=cF1>U0</span><span class=cF0> </span><span class=cF5>DrawIt</span><span class=cF0>(</span><span class=cF9>CTask</span><span class=cF0> *task,</span><span class=cF9>CDC</span><span class=cF0> *dc)
<a name="l14"></a>{
<a name="l15"></a> </span><span class=cF9>I64</span><span class=cF0> i,
<a name="l16"></a> cx=task-&gt;pix_width&gt;&gt;1,
<a name="l17"></a> cy=task-&gt;pix_height&gt;&gt;1;
<a name="l18"></a> </span><span class=cF1>Bool</span><span class=cF0> snd_on=</span><span class=cF3>FALSE</span><span class=cF0>;
<a name="l19"></a> dc-&gt;color=</span><span class=cF3>BLACK</span><span class=cF0>;
<a name="l20"></a> </span><span class=cF5>GrPrint</span><span class=cF0>(dc,0,0,</span><span class=cF6>&quot;Protect your base.&quot;</span><span class=cF0>);
<a name="l21"></a> </span><span class=cF5>GrRect</span><span class=cF0>(dc,cx-BASE_SIZE,cy-BASE_SIZE,BASE_SIZE*2,BASE_SIZE*2);
<a name="l22"></a> dc-&gt;color=</span><span class=cF3>CYAN</span><span class=cF0>;
<a name="l23"></a> </span><span class=cF5>GrRect</span><span class=cF0>(dc,cx-BASE_SIZE+2,cy-BASE_SIZE+2,BASE_SIZE*2-4,BASE_SIZE*2-4);
<a name="l24"></a> dc-&gt;color=</span><span class=cF3>YELLOW</span><span class=cF0>;
<a name="l25"></a> </span><span class=cF5>GrLine</span><span class=cF0>(dc,balls[0].x,balls[0].y,
<a name="l26"></a> </span><span class=cFB>ms</span><span class=cF0>.pos.x-task-&gt;pix_left-task-&gt;scroll_x,
<a name="l27"></a> </span><span class=cFB>ms</span><span class=cF0>.pos.y-task-&gt;pix_top-task-&gt;scroll_y);
<a name="l28"></a> </span><span class=cF1>for</span><span class=cF0> (i=0;i&lt;SPRINGS_NUM;i++)
<a name="l29"></a> </span><span class=cF5>GrLine</span><span class=cF0>(dc,springs[i].end1-&gt;x,springs[i].end1-&gt;y,
<a name="l30"></a> springs[i].end2-&gt;x,springs[i].end2-&gt;y);
<a name="l31"></a>
<a name="l32"></a> dc-&gt;color=</span><span class=cF3>LTCYAN</span><span class=cF0>;
<a name="l33"></a> </span><span class=cF5>GrCircle</span><span class=cF0>(dc,balls[0].x,balls[0].y,BALL_RADIUS);
<a name="l34"></a> </span><span class=cF5>GrFloodFill</span><span class=cF0>(dc,balls[0].x,balls[0].y,</span><span class=cF3>TRUE</span><span class=cF0>);
<a name="l35"></a> dc-&gt;color=</span><span class=cF3>BLACK</span><span class=cF0>;
<a name="l36"></a> </span><span class=cF5>GrCircle</span><span class=cF0>(dc,balls[0].x,balls[0].y,BALL_RADIUS);
<a name="l37"></a>
<a name="l38"></a> </span><span class=cF1>for</span><span class=cF0> (i=1;i&lt;BALLS_NUM;i++) </span><span class=cF7>{</span><span class=cF0>
<a name="l39"></a> dc-&gt;color=</span><span class=cF3>LTPURPLE</span><span class=cF0>;
<a name="l40"></a> </span><span class=cF5>GrCircle</span><span class=cF0>(dc,balls[i].x,balls[i].y,BALL_RADIUS);
<a name="l41"></a> </span><span class=cF5>GrFloodFill</span><span class=cF0>(dc,balls[i].x,balls[i].y,</span><span class=cF3>TRUE</span><span class=cF0>);
<a name="l42"></a> </span><span class=cF1>if</span><span class=cF0> (cx-BASE_SIZE-BALL_RADIUS&lt;=balls[i].x&lt;=cx+BASE_SIZE+BALL_RADIUS &amp;&amp;
<a name="l43"></a> cy-BASE_SIZE-BALL_RADIUS&lt;=balls[i].y&lt;=cy+BASE_SIZE+BALL_RADIUS)
<a name="l44"></a> snd_on=</span><span class=cF3>TRUE</span><span class=cF0>;
<a name="l45"></a> dc-&gt;color=</span><span class=cF3>BLACK</span><span class=cF0>;
<a name="l46"></a> </span><span class=cF5>GrCircle</span><span class=cF0>(dc,balls[i].x,balls[i].y,BALL_RADIUS);
<a name="l47"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l48"></a> </span><span class=cF1>if</span><span class=cF0> (snd_on)
<a name="l49"></a> </span><span class=cF5>Snd</span><span class=cF0>(74);
<a name="l50"></a> </span><span class=cF1>else</span><span class=cF0>
<a name="l51"></a> </span><span class=cF5>Snd</span><span class=cF0>;
<a name="l52"></a>}
<a name="l53"></a>
<a name="l54"></a></span><span class=cF1>U0</span><span class=cF0> MyDerivative(</span><span class=cF9>CMathODE</span><span class=cF0> *ode,</span><span class=cF1>F64</span><span class=cF0> t,</span><span class=cF9>COrder2D3</span><span class=cF0> *,</span><span class=cF9>COrder2D3</span><span class=cF0> *)
<a name="l55"></a>{
<a name="l56"></a> </span><span class=cF9>I64</span><span class=cF0> i,j;
<a name="l57"></a> </span><span class=cF1>F64</span><span class=cF0> d,dd;
<a name="l58"></a> </span><span class=cF9>CD3</span><span class=cF0> p,p2;
<a name="l59"></a> </span><span class=cF9>CTask</span><span class=cF0> *task=ode-&gt;win_task;
<a name="l60"></a>
<a name="l61"></a> </span><span class=cF5>D3SubEqu</span><span class=cF0>(</span><span class=cF5>D3Equ</span><span class=cF7>(</span><span class=cF0>&amp;p2,
<a name="l62"></a> </span><span class=cFB>ms</span><span class=cF0>.pos.x-task-&gt;pix_left-task-&gt;scroll_x,
<a name="l63"></a> </span><span class=cFB>ms</span><span class=cF0>.pos.y-task-&gt;pix_top-task-&gt;scroll_y,0</span><span class=cF7>)</span><span class=cF0>,
<a name="l64"></a> &amp;balls[0].state-&gt;x);
<a name="l65"></a> </span><span class=cF5>D3AddEqu</span><span class=cF0>(&amp;balls[0].DstateDt-&gt;DxDt,</span><span class=cF5>D3MulEqu</span><span class=cF7>(</span><span class=cF0>&amp;p2,STRETCH</span><span class=cF7>)</span><span class=cF0>);
<a name="l66"></a>
<a name="l67"></a> </span><span class=cF5>D3Equ</span><span class=cF0>(&amp;p2,task-&gt;pix_width&gt;&gt;1,task-&gt;pix_height&gt;&gt;1,0);
<a name="l68"></a> </span><span class=cF1>for</span><span class=cF0> (i=1;i&lt;BALLS_NUM;i++) </span><span class=cF7>{</span><span class=cF0>
<a name="l69"></a> </span><span class=cF5>D3Sub</span><span class=cF0>(&amp;p,&amp;p2,&amp;balls[i].state-&gt;x);
<a name="l70"></a> </span><span class=cF1>if</span><span class=cF0> (d=</span><span class=cF5>D3Norm</span><span class=cF7>(</span><span class=cF0>&amp;p</span><span class=cF7>)</span><span class=cF0>) {
<a name="l71"></a></span><span class=cF2>//Gravity would be /(d*d*d), but that's too exponential.</span><span class=cF0>
<a name="l72"></a> </span><span class=cF5>D3MulEqu</span><span class=cF0>(&amp;p,GRAVITY/d);
<a name="l73"></a> </span><span class=cF5>D3AddEqu</span><span class=cF0>(&amp;balls[i].DstateDt-&gt;DxDt,&amp;p);
<a name="l74"></a> }
<a name="l75"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l76"></a>
<a name="l77"></a> </span><span class=cF1>for</span><span class=cF0> (i=0;i&lt;BALLS_NUM;i++)
<a name="l78"></a> </span><span class=cF1>for</span><span class=cF0> (j=i+1;j&lt;BALLS_NUM;j++) </span><span class=cF7>{</span><span class=cF0>
<a name="l79"></a> </span><span class=cF5>D3Sub</span><span class=cF0>(&amp;p,&amp;balls[j].state-&gt;x,&amp;balls[i].state-&gt;x);
<a name="l80"></a> dd=</span><span class=cF5>D3NormSqr</span><span class=cF0>(&amp;p);
<a name="l81"></a> </span><span class=cF1>if</span><span class=cF0> (dd&lt;=</span><span class=cF7>(</span><span class=cF0>2*BALL_RADIUS</span><span class=cF7>)</span><span class=cF0>*</span><span class=cF7>(</span><span class=cF0>2*BALL_RADIUS</span><span class=cF7>)</span><span class=cF0>) {
<a name="l82"></a> </span><span class=cF1>if</span><span class=cF0> (t-collision_t&gt;0.05) </span><span class=cF7>{</span><span class=cF0>
<a name="l83"></a> </span><span class=cF5>Noise</span><span class=cF0>(50,102,105);
<a name="l84"></a> collision_t=t;
<a name="l85"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l86"></a> d=</span><span class=cF5>Sqrt</span><span class=cF0>(dd)+0.0001;
<a name="l87"></a> dd=10.0*</span><span class=cF5>Sqr</span><span class=cF0>(</span><span class=cF5>Sqr</span><span class=cF7>(</span><span class=cF0>(2*BALL_RADIUS)*(2*BALL_RADIUS)-dd</span><span class=cF7>)</span><span class=cF0>);
<a name="l88"></a> </span><span class=cF5>D3MulEqu</span><span class=cF0>(&amp;p,dd/d);
<a name="l89"></a> </span><span class=cF5>D3AddEqu</span><span class=cF0>(&amp;balls[j].DstateDt-&gt;DxDt,&amp;p);
<a name="l90"></a> </span><span class=cF5>D3SubEqu</span><span class=cF0>(&amp;balls[i].DstateDt-&gt;DxDt,&amp;p);
<a name="l91"></a> }
<a name="l92"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l93"></a>
<a name="l94"></a> d=balls[0].state-&gt;x;
<a name="l95"></a> </span><span class=cF1>if</span><span class=cF0> (d-BALL_RADIUS&lt;0)
<a name="l96"></a> balls[0].DstateDt-&gt;DxDt+=</span><span class=cF5>Sqr</span><span class=cF0>(</span><span class=cF5>Sqr</span><span class=cF7>(</span><span class=cF5>Sqr</span><span class=cF0>(d-BALL_RADIUS)</span><span class=cF7>)</span><span class=cF0>);
<a name="l97"></a> </span><span class=cF1>if</span><span class=cF0> (d+BALL_RADIUS&gt;task-&gt;pix_width)
<a name="l98"></a> balls[0].DstateDt-&gt;DxDt-=</span><span class=cF5>Sqr</span><span class=cF0>(</span><span class=cF5>Sqr</span><span class=cF7>(</span><span class=cF5>Sqr</span><span class=cF0>(</span><span class=cF7>(</span><span class=cF0>d+BALL_RADIUS</span><span class=cF7>)</span><span class=cF0>-task-&gt;pix_width)</span><span class=cF7>)</span><span class=cF0>);
<a name="l99"></a>
<a name="l100"></a> d=balls[0].state-&gt;y;
<a name="l101"></a> </span><span class=cF1>if</span><span class=cF0> (d-BALL_RADIUS&lt;0)
<a name="l102"></a> balls[0].DstateDt-&gt;DyDt+=</span><span class=cF5>Sqr</span><span class=cF0>(</span><span class=cF5>Sqr</span><span class=cF7>(</span><span class=cF5>Sqr</span><span class=cF0>(d-BALL_RADIUS)</span><span class=cF7>)</span><span class=cF0>);
<a name="l103"></a> </span><span class=cF1>if</span><span class=cF0> (d+BALL_RADIUS&gt;task-&gt;pix_height)
<a name="l104"></a> balls[0].DstateDt-&gt;DyDt-=</span><span class=cF5>Sqr</span><span class=cF0>(</span><span class=cF5>Sqr</span><span class=cF7>(</span><span class=cF5>Sqr</span><span class=cF0>(</span><span class=cF7>(</span><span class=cF0>d+BALL_RADIUS</span><span class=cF7>)</span><span class=cF0>-task-&gt;pix_height)</span><span class=cF7>)</span><span class=cF0>);
<a name="l105"></a>}
<a name="l106"></a>
<a name="l107"></a></span><span class=cF1>U0</span><span class=cF0> Whap()
<a name="l108"></a>{
<a name="l109"></a> </span><span class=cF9>I64</span><span class=cF0> i;
<a name="l110"></a> </span><span class=cF9>CMathODE</span><span class=cF0> *ode=</span><span class=cF5>ODENew</span><span class=cF0>(0,1e-2,</span><span class=cF3>ODEF_HAS_MASSES</span><span class=cF0>);
<a name="l111"></a>
<a name="l112"></a> </span><span class=cF5>SettingsPush</span><span class=cF0>; </span><span class=cF2>//See </span><a href="/Wb/Adam/TaskSettings.HC.HTML#l3"><span class=cF4>SettingsPush</span></a><span class=cF0>
<a name="l113"></a> </span><span class=cF5>AutoComplete</span><span class=cF0>;
<a name="l114"></a> </span><span class=cF5>WinBorder</span><span class=cF0>;
<a name="l115"></a> </span><span class=cF5>WinMax</span><span class=cF0>;
<a name="l116"></a>
<a name="l117"></a> </span><span class=cF5>MenuPush</span><span class=cF0>(
<a name="l118"></a> </span><span class=cF6>&quot;File {&quot;</span><span class=cF0>
<a name="l119"></a> </span><span class=cF6>&quot; Abort(,CH_SHIFT_ESC);&quot;</span><span class=cF0>
<a name="l120"></a> </span><span class=cF6>&quot; Exit(,CH_ESC);&quot;</span><span class=cF0>
<a name="l121"></a> </span><span class=cF6>&quot;}&quot;</span><span class=cF0>
<a name="l122"></a> );
<a name="l123"></a> ode-&gt;derive=&amp;MyDerivative;
<a name="l124"></a> ode-&gt;drag_v2=0.002;
<a name="l125"></a> ode-&gt;drag_v3=0.00001;
<a name="l126"></a> ode-&gt;acceleration_limit=5e3;
<a name="l127"></a> </span><span class=cF5>MemSet</span><span class=cF0>(balls,0,BALLS_NUM*</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF9>CMass</span><span class=cF7>)</span><span class=cF0>);
<a name="l128"></a> </span><span class=cF5>D3Equ</span><span class=cF0>(&amp;balls[0].x,100,100,0);
<a name="l129"></a> </span><span class=cF1>for</span><span class=cF0> (i=1;i&lt;BALLS_NUM;i++)
<a name="l130"></a> </span><span class=cF5>D3Equ</span><span class=cF0>(&amp;balls[i].x,
<a name="l131"></a> </span><span class=cF5>RandI16</span><span class=cF0>%500+</span><span class=cF5>Fs</span><span class=cF0>-&gt;pix_width&gt;&gt;1,</span><span class=cF5>RandI16</span><span class=cF0>%500+</span><span class=cF5>Fs</span><span class=cF0>-&gt;pix_height&gt;&gt;1,0);
<a name="l132"></a> balls[0].x=</span><span class=cFB>ms</span><span class=cF0>.pos.x-</span><span class=cF5>Fs</span><span class=cF0>-&gt;pix_left-</span><span class=cF5>Fs</span><span class=cF0>-&gt;scroll_x;
<a name="l133"></a> balls[0].y=</span><span class=cFB>ms</span><span class=cF0>.pos.y-</span><span class=cF5>Fs</span><span class=cF0>-&gt;pix_top-</span><span class=cF5>Fs</span><span class=cF0>-&gt;scroll_y;
<a name="l134"></a> </span><span class=cF1>for</span><span class=cF0> (i=0;i&lt;BALLS_NUM;i++) </span><span class=cF7>{</span><span class=cF0>
<a name="l135"></a> balls[i].mass=1.0;
<a name="l136"></a> balls[i].drag_profile_factor=1.0;
<a name="l137"></a> </span><span class=cF5>QueIns</span><span class=cF0>(&amp;balls[i],ode-&gt;last_mass);
<a name="l138"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l139"></a> balls[2].x=balls[1].x+15;
<a name="l140"></a> balls[2].y=balls[1].y;
<a name="l141"></a> balls[3].x=balls[1].x;
<a name="l142"></a> balls[3].y=balls[1].y+15;
<a name="l143"></a> </span><span class=cF5>MemSet</span><span class=cF0>(springs,0,SPRINGS_NUM*</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF9>CSpring</span><span class=cF7>)</span><span class=cF0>);
<a name="l144"></a> springs[0].end1=&amp;balls[1];
<a name="l145"></a> springs[0].end2=&amp;balls[2];
<a name="l146"></a> springs[0].rest_len=15;
<a name="l147"></a> springs[0].const=10000;
<a name="l148"></a> </span><span class=cF5>QueIns</span><span class=cF0>(&amp;springs[0],ode-&gt;last_spring);
<a name="l149"></a> springs[1].end1=&amp;balls[1];
<a name="l150"></a> springs[1].end2=&amp;balls[3];
<a name="l151"></a> springs[1].rest_len=15;
<a name="l152"></a> springs[1].const=10000;
<a name="l153"></a> </span><span class=cF5>QueIns</span><span class=cF0>(&amp;springs[1],ode-&gt;last_spring);
<a name="l154"></a> springs[2].end1=&amp;balls[2];
<a name="l155"></a> springs[2].end2=&amp;balls[3];
<a name="l156"></a> springs[2].rest_len=</span><span class=cF3>sqrt2</span><span class=cF0>*15;
<a name="l157"></a> springs[2].const=10000;
<a name="l158"></a> </span><span class=cF5>QueIns</span><span class=cF0>(&amp;springs[2],ode-&gt;last_spring);
<a name="l159"></a>
<a name="l160"></a> collision_t=0;
<a name="l161"></a> </span><span class=cF5>QueIns</span><span class=cF0>(ode,</span><span class=cF5>Fs</span><span class=cF0>-&gt;last_ode);
<a name="l162"></a>
<a name="l163"></a> </span><span class=cF5>DocCursor</span><span class=cF0>;
<a name="l164"></a> </span><span class=cF5>DocClear</span><span class=cF0>;
<a name="l165"></a> </span><span class=cF5>Fs</span><span class=cF0>-&gt;draw_it=&amp;</span><span class=cF5>DrawIt</span><span class=cF0>;
<a name="l166"></a> </span><span class=cF5>GetChar</span><span class=cF0>;
<a name="l167"></a> </span><span class=cF5>SettingsPop</span><span class=cF0>;
<a name="l168"></a> </span><span class=cF5>QueRem</span><span class=cF0>(ode);
<a name="l169"></a> </span><span class=cF5>ODEDel</span><span class=cF0>(ode);
<a name="l170"></a> </span><span class=cF5>MenuPop</span><span class=cF0>;
<a name="l171"></a>}
<a name="l172"></a>
<a name="l173"></a>Whap;
</span></pre></body>
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