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BangleApps
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improved speed of arrow drawCompass() function to avoid causing issue with buttons becoming unresponsive

master
hughbarney 2021-03-17 12:49:20 +00:00
parent cc4cea3a30
commit e259fbef10
3 changed files with 33 additions and 21 deletions
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2
apps.json
View File

@ -2897,7 +2897,7 @@
"name": "Arrow Compass",
"icon": "arrow.png",
"type":"app",
"version":"0.02",
"version":"0.03",
"description": "Moving arrow compass that points North, shows heading, with tilt correction. Based on jeffmer's Navigation Compass",
"tags": "tool,outdoors",
"readme": "README.md",

1
apps/arrow/ChangeLog
View File

@ -1,2 +1,3 @@
0.01: First version
0.02: Moved arrow image load to global scope
0.03: faster drawCompass() function, does not cause buttons to become unresponsive

51
apps/arrow/app.js
View File

@ -1,19 +1,17 @@
var pal1color = new Uint16Array([0x0000,0xFFC0],0,1);
var pal2color = new Uint16Array([0x0000,0xffff],0,1);
var buf1 = Graphics.createArrayBuffer(160,160,1,{msb:true});
var buf1 = Graphics.createArrayBuffer(128,128,1,{msb:true});
var buf2 = Graphics.createArrayBuffer(80,40,1,{msb:true});
var img = require("heatshrink").decompress(atob("lEowIPMjAEDngEDvwED/4DCgP/wAEBgf/4AEBg//8AEBh//+AEBj///AEBn///gEBv///wmCAAImCAAIoBFggE/AkaaEABo="));
var intervalRef;
var bearing=0; // always point north
var heading = 0;
var oldHeading = 0;
var candraw = false;
var CALIBDATA = require("Storage").readJSON("magnav.json",1)||null;
Bangle.setLCDTimeout(30);
function flip1(x,y) {
g.drawImage({width:160,height:160,bpp:1,buffer:buf1.buffer, palette:pal1color},x,y);
buf1.clear();
g.drawImage({width:128,height:128,bpp:1,buffer:buf1.buffer, palette:pal1color},x,y);
buf1.clear();
}
function flip2(x,y) {
@ -25,18 +23,32 @@ function radians(d) {
return (d*Math.PI) / 180;
}
function drawCompass(course) {
// takes 32ms
function drawCompass(hd) {
if(!candraw) return;
buf1.setColor(1);
buf1.fillCircle(80,80,79,79);
buf1.setColor(0);
buf1.fillCircle(80,80,69,69);
buf1.setColor(1);
buf1.drawImage(img, 80, 80, {scale:3, rotate:radians(course)} );
flip1(40, 30);
if (Math.abs(hd - oldHeading) < 2) return 0;
var t1 = getTime();
hd=hd*Math.PI/180;
var p = [0, 1.1071, Math.PI/4, 2.8198, 3.4633, 7*Math.PI/4 , 5.1760];
// using polar cordinates, 64,64 is the offset from the 0,0 origin
var poly = [
64+60*Math.sin(hd+p[0]), 64-60*Math.cos(hd+p[0]),
64+44.7214*Math.sin(hd+p[1]), 64-44.7214*Math.cos(hd+p[1]),
64+28.2843*Math.sin(hd+p[2]), 64-28.2843*Math.cos(hd+p[2]),
64+63.2455*Math.sin(hd+p[3]), 64-63.2455*Math.cos(hd+p[3]),
64+63.2455*Math.sin(hd+p[4]), 64-63.2455*Math.cos(hd+p[4]),
64+28.2843*Math.sin(hd+p[5]), 64-28.2843*Math.cos(hd+p[5]),
64+44.7214*Math.sin(hd+p[6]), 64-44.7214*Math.cos(hd+p[6])
];
buf1.fillPoly(poly);
flip1(56, 56);
var t = Math.round((getTime() - t1)*1000);
LED1.write((t > 100));
}
// stops violent compass swings and wobbles, takes 3ms
function newHeading(m,h){
var s = Math.abs(m - h);
var delta = (m>h)?1:-1;
@ -48,6 +60,7 @@ function newHeading(m,h){
return hd;
}
// takes approx 7ms
function tiltfixread(O,S){
var start = Date.now();
var m = Bangle.getCompass();
@ -66,7 +79,6 @@ function tiltfixread(O,S){
return psi;
}
// Note actual mag is 360-m, error in firmware
function reading() {
var d = tiltfixread(CALIBDATA.offset,CALIBDATA.scale);
heading = newHeading(d,heading);
@ -74,6 +86,7 @@ function reading() {
if (dir < 0) dir += 360;
if (dir > 360) dir -= 360;
drawCompass(dir); // we want compass to show us where to go
oldHeading = dir;
buf2.setColor(1);
buf2.setFontAlign(-1,-1);
buf2.setFont("Vector",38);
@ -142,14 +155,12 @@ function docalibrate(e,first){
E.showPrompt(msg,{title:title,buttons:{"Start":true,"Cancel":false}}).then(action);
}
var intervalRef;
function startdraw(){
g.clear();
g.setColor(1,1,1);
Bangle.drawWidgets();
candraw = true;
intervalRef = setInterval(reading,200);
intervalRef = setInterval(reading,500);
}
function stopdraw() {