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| − | <nowiki>
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| − | <html>
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| − | <br><br>
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| − | <form name="l">
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| − | <blockquote><table border=0 cellpadding=1 cellspacing=0 bgcolor="#C0C0C0"><tr><td><table border=0 cellpadding=4 cellspacing=0 bgcolor="#F8F8F8"><tr><td>
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| − | <table><tr><td>
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| − | <table>
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| − | <tr><td align=right><b>Near Distance From Wall</b></td><td><input name="distancefromwall1" type="text" size=10></td></tr>
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| − | <tr><td align=right><b>Near Wall Distance</b></td><td><input name="walldistance1" type="text" size=10></td></tr>
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| − | <tr><td align=right><b>Far Distance From Wall</b></td><td><input name="distancefromwall2" type="text" size=10></td></tr>
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| − | <tr><td align=right><b>Far Wall Distance</b></td><td><input name="walldistance2" type="text" size=10></td></tr>
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| − | </table>
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| − | </td><td> </td><td>
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| − | <input type="button" value="Calculate Answer" onClick="javascript:calculate()"><br>
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| − | <br>
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| − | Near FOV° = <span id="fovest1"></span><br>
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| − | Far FOV° = <span id="fovest2"></span><br>
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| − | k = <span id="kanswer"></span><br>
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| − | Final FOV° = <span id="fovanswer"></span><br>
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| − | Effective focal length = <span id="angularfocallength"></span><br>
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| − | </td></tr></table>
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| − | </td></tr></table></td></tr></table></blockquote>
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| − | </form>
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| − |
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| − | <script>
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| − | function roundNumber(num,dec) {
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| − | var result = Math.round(num*Math.pow(10,dec))/Math.pow(10,dec);
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| − | return result;
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| − | }
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| − | function ffov(y,x) {
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| − | return (2*Math.atan(y/x)) * 180/Math.PI;
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| − | }
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| − | function efl(deg) {
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| − | return (36/2) / Math.tan((deg/2)/180*Math.PI);
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| − | }
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| − | function calculate() {
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| − | var x1 = 1.0 * document.l.distancefromwall1.value;
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| − | var y1 = 1.0 * document.l.walldistance1.value/2;
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| − | var x2 = 1.0 * document.l.distancefromwall2.value;
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| − | var y2 = 1.0 * document.l.walldistance2.value/2;
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| − | var k = (y1*x2 - x1*y2) / (y2-y1);
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| − | var jj = document.getElementById("kanswer");
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| − | if (jj) {
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| − | jj.innerHTML = roundNumber(k,3);
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| − | }
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| − | var fov = ffov(y1,x1);
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| − | jj = document.getElementById("fovest1");
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| − | if (jj) {
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| − | jj.innerHTML = roundNumber(fov,2)+"°";
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| − | }
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| − | var fov = ffov(y2,x2);
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| − | jj = document.getElementById("fovest2");
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| − | if (jj) {
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| − | jj.innerHTML = roundNumber(fov,2)+"°";
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| − | }
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| − | fov = ffov(y1,(x1+k));
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| − | jj = document.getElementById("fovanswer");
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| − | if (jj) {
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| − | jj.innerHTML = "<b>"+roundNumber(fov,2)+"°</b>";
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| − | }
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| − | jj = document.getElementById("angularfocallength");
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| − | if (jj) {
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| − | jj.innerHTML = "<b>"+roundNumber(efl(fov),2)+"</b>";
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| − | }
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| − | }
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| − | function lenstest1() {
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| − | document.l.distancefromwall1.value = "29.125";
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| − | document.l.walldistance1.value = "39.84375";
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| − | document.l.distancefromwall2.value = "68";
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| − | document.l.walldistance2.value = "91.375";
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| − | calculate();
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| − | }
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| − | function lenstest2() {
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| − | document.l.distancefromwall1.value = "36";
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| − | document.l.walldistance1.value = "49.625";
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| − | document.l.distancefromwall2.value = "107.4375";
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| − | document.l.walldistance2.value = "145.375";
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| − | calculate();
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| − | }
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| − | function lenstest3() {
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| − | document.l.distancefromwall1.value = "34";
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| − | document.l.walldistance1.value = "48.125";
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| − | document.l.distancefromwall2.value = "77.5625";
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| − | document.l.walldistance2.value = "107.0625";
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| − | calculate();
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| − | }
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| − | function lenstest4() {
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| − | document.l.distancefromwall1.value = "30.875";
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| − | document.l.walldistance1.value = "42.25";
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| − | document.l.distancefromwall2.value = "74.125";
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| − | document.l.walldistance2.value = "100.125";
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| − | calculate();
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| − | }
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| − | function lenstest5() {
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| − | // 700_1219, 700_1220
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| − | document.l.distancefromwall1.value = "18";
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| − | document.l.walldistance1.value = "4.08";
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| − | document.l.distancefromwall2.value = "30";
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| − | document.l.walldistance2.value = "7.0162";
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| − | calculate();
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| − | }
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| − | </script>
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| − | </td></tr></table>
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| − | </body></html>
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| − | </nowiki>
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