mirror of https://github.com/espruino/BangleApps
48 lines
1.4 KiB
JavaScript
48 lines
1.4 KiB
JavaScript
(function() {
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var heading, cnt;
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function magHandler(m) {
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var h = m.heading;
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if (isNaN(heading) || isNaN(h))
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heading = h;
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else {
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// Average
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if (Math.abs(heading-h)>180) {
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if (h<180 && heading>180) h+=360;
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if (h>180 && heading<180) h-=360;
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}
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heading = heading*0.8 + h*0.2;
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if (heading<0) heading+=360;
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if (heading>=360) heading-=360;
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}
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// only draw 1 in 2 to try and save some power!
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if (!(1&cnt++)) ci.items[0].emit('redraw');
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}
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var ci = {
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name: "Bangle",
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items: [
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{ name : "Compass",
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get : function() {
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var g = Graphics.createArrayBuffer(24,24,1,{msb:true});
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if (isNaN(heading))
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g.drawLine(8,12,16,12);
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else
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g.fillPoly(g.transformVertices([0,-10,4,10,-4,10],{x:12,y:12,rotate:-heading/57}));
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return { text : isNaN(heading)?"--":Math.round(heading),
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v : 0|heading, min : 0, max : 360,
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img : g.asImage("string") }},
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show : function() {
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Bangle.setCompassPower(1,"clkinfomag");
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Bangle.on('mag',magHandler);
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cnt=0;
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heading = undefined;
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},
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hide : function() {
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Bangle.removeListener('mag', magHandler);
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Bangle.setCompassPower(0,"clkinfomag");
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},
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run : function() { Bangle.resetCompass(); }
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}
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]
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};
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return ci;
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}) // must not have a semi-colon!
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