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<a name="l1"></a><span class=cF2>//Uses </span><a href="/Wb/Demo/Lectures/FixedPoint.HC.HTML#l1"><span class=cF4>fixed-point-arithmetic</span></a><span class=cF2>.</span><span class=cF0>
<a name="l2"></a>
<a name="l3"></a></span><span class=cF9>I64</span><span class=cF0> x[16],y[16],dx[16],dy[16];
<a name="l4"></a>
<a name="l5"></a></span><span class=cF1>U0</span><span class=cF0> Init()
<a name="l6"></a>{
<a name="l7"></a> </span><span class=cF9>I64</span><span class=cF0> i;
<a name="l8"></a> </span><span class=cF1>F64</span><span class=cF0> theta;
<a name="l9"></a> </span><span class=cF5>MemSet</span><span class=cF0>(x,0,</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>x</span><span class=cF7>)</span><span class=cF0>);
<a name="l10"></a> </span><span class=cF5>MemSet</span><span class=cF0>(y,0,</span><span class=cF1>sizeof</span><span class=cF7>(</span><span class=cF0>y</span><span class=cF7>)</span><span class=cF0>);
<a name="l11"></a> </span><span class=cF1>for</span><span class=cF0> (i=0;i<16;i++) </span><span class=cF7>{</span><span class=cF0>
<a name="l12"></a> theta=</span><span class=cF5>Rand</span><span class=cF0>*2*</span><span class=cF3>pi</span><span class=cF0>;
<a name="l13"></a> dx[i]=</span><span class=cF3>I32_MAX</span><span class=cF0>*</span><span class=cF5>Cos</span><span class=cF0>(theta);
<a name="l14"></a> dy[i]=</span><span class=cF3>I32_MAX</span><span class=cF0>*</span><span class=cF5>Sin</span><span class=cF0>(theta);
<a name="l15"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l16"></a>}
<a name="l17"></a>
<a name="l18"></a></span><span class=cF1>U0</span><span class=cF0> Bounce()
<a name="l19"></a>{
<a name="l20"></a> </span><span class=cF9>CDC</span><span class=cF0> *dc=</span><span class=cF5>DCAlias</span><span class=cF0>;
<a name="l21"></a> </span><span class=cF9>I64</span><span class=cF0> i,ch;
<a name="l22"></a> Init;
<a name="l23"></a> </span><span class=cF1>try</span><span class=cF0> </span><span class=cF7>{</span><span class=cF2>//Catch <CTRL-ALT-c></span><span class=cF0>
<a name="l24"></a> </span><span class=cF1>do</span><span class=cF0> {
<a name="l25"></a> </span><span class=cF1>for</span><span class=cF0> (i=0;i<16;i++) </span><span class=cF7>{</span><span class=cF0>
<a name="l26"></a> dc->color=i;
<a name="l27"></a> </span><span class=cF5>GrPlot</span><span class=cF0>(dc,x[i].i32[1],y[i].i32[1]);
<a name="l28"></a> x[i]+=dx[i];
<a name="l29"></a> y[i]+=dy[i];
<a name="l30"></a> </span><span class=cF1>if</span><span class=cF0> (!</span><span class=cF7>(</span><span class=cF0>0<=x[i]<</span><span class=cF5>Fs</span><span class=cF0>->pix_width<<32</span><span class=cF7>)</span><span class=cF0>) {
<a name="l31"></a> x[i]-=dx[i];
<a name="l32"></a> dx[i]=-dx[i];
<a name="l33"></a> }
<a name="l34"></a> </span><span class=cF1>if</span><span class=cF0> (!</span><span class=cF7>(</span><span class=cF0>0<=y[i]<</span><span class=cF5>Fs</span><span class=cF0>->pix_height<<32</span><span class=cF7>)</span><span class=cF0>) {
<a name="l35"></a> y[i]-=dy[i];
<a name="l36"></a> dy[i]=-dy[i];
<a name="l37"></a> }
<a name="l38"></a> </span><span class=cF7>}</span><span class=cF0>
<a name="l39"></a> </span><span class=cF5>Yield</span><span class=cF0>;
<a name="l40"></a> } </span><span class=cF1>while</span><span class=cF0> (!</span><span class=cF7>(</span><span class=cF0>ch=</span><span class=cF5>ScanChar</span><span class=cF7>)</span><span class=cF0> || </span><span class=cF7>(</span><span class=cF0>ch!=</span><span class=cF3>CH_SHIFT_ESC</span><span class=cF0> && ch!=</span><span class=cF3>CH_ESC</span><span class=cF7>)</span><span class=cF0>);
<a name="l41"></a> </span><span class=cF7>}</span><span class=cF0> </span><span class=cF1>catch</span><span class=cF0>
<a name="l42"></a> </span><span class=cF5>PutExcept</span><span class=cF0>;
<a name="l43"></a> </span><span class=cF5>DCFill</span><span class=cF0>(dc);
<a name="l44"></a> </span><span class=cF5>DCDel</span><span class=cF0>(dc);
<a name="l45"></a>}
<a name="l46"></a>
<a name="l47"></a>Bounce;
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