forked from FOSS/BangleApps
47 lines
1.2 KiB
JavaScript
47 lines
1.2 KiB
JavaScript
g.clear().setRotation(1);
|
|
// g.setRotation ALSO changes accelerometer axes
|
|
var avrAngle = undefined;
|
|
var history = [];
|
|
|
|
var R = Bangle.appRect;
|
|
var relativeTo = undefined;
|
|
|
|
function draw(v) {
|
|
if (v===undefined) v = Bangle.getAccel();
|
|
// current angle
|
|
var d = Math.sqrt(v.y*v.y + v.z*v.z);
|
|
var ang = Math.atan2(-v.x, d)*180/Math.PI;
|
|
// Median filter
|
|
if (history.length > 10) history.shift(); // pull old reading off the start
|
|
history.push(ang);
|
|
avrAngle = history.slice().sort()[(history.length-1)>>1]; // median filter
|
|
// Render
|
|
var x = R.x + R.w/2;
|
|
var y = R.y + R.h/2;
|
|
g.reset().clearRect(R).setFontAlign(0,0);
|
|
var displayAngle = avrAngle;
|
|
g.setFont("6x15").drawString("ANGLE (DEGREES)", x, R.y2-8);
|
|
if (relativeTo!==undefined) {
|
|
g.drawString("RELATIVE TO", x,y-50);
|
|
g.setFont("Vector:30").drawString(relativeTo.toFixed(1),x,y-30);
|
|
y += 20;
|
|
displayAngle = displayAngle-relativeTo;
|
|
}
|
|
g.setFont("Vector:60").drawString(displayAngle.toFixed(1),x,y);
|
|
|
|
}
|
|
|
|
draw();
|
|
Bangle.on('accel',draw);
|
|
|
|
// Pressing the button turns relative angle on/off
|
|
Bangle.setUI({
|
|
mode : "custom",
|
|
btn : function(n) {
|
|
if (relativeTo===undefined)
|
|
relativeTo = avrAngle;
|
|
else
|
|
relativeTo = undefined;
|
|
draw();
|
|
}
|
|
}); |