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Matrix clock: Optimized the character generation and management

master
adrian w kirk 2021-09-27 00:50:03 +01:00
parent 5ed1ce1c96
commit 8f5e58e2bc
1 changed files with 14 additions and 5 deletions
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19
apps/matrixclock/matrixclock.js
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@ -79,9 +79,11 @@ class TextShard {
/** /**
* random character chooser to be called by the shard when adding characters * random character chooser to be called by the shard when adding characters
*/ */
const chars = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789~`!@#$%^&*()_+-={}[]:";\'<>?,./|\\'; const CHAR_CODE_START = 33;
const CHAR_CODE_LAST = 126;
const CHAR_CODE_LENGTH = CHAR_CODE_LAST - CHAR_CODE_START;
function randomChar(){ function randomChar(){
return chars[Math.floor(Math.random() * chars.length)]; return String.fromCharCode(Math.floor(Math.random() * CHAR_CODE_LENGTH)+ CHAR_CODE_START);
} }
// Now set up the shards // Now set up the shards
@ -112,13 +114,17 @@ const TIME_X_COORD = 20;
const TIME_Y_COORD = 100; const TIME_Y_COORD = 100;
const DATE_X_COORD = 170; const DATE_X_COORD = 170;
const DATE_Y_COORD = 30; const DATE_Y_COORD = 30;
const RESET_PROBABILITY = 0.8;
/** /**
* main loop to draw the clock face * main loop to draw the clock face
*/ */
function draw_clock(){ function draw_clock(){
// first move all the shards down the screen // first move all the shards down the screen
for(var i=0; i<this.shards.length; i++){ for(var i=0; i<this.shards.length; i++){
if(!shards[i].isVisible() && Math.random() > 0.7){ var visible = shards[i].isVisible();
// once the shard is no longer visible we wait
// a random no of loops before reseting
if(!visible && Math.random() > RESET_PROBABILITY){
shards[i].reset(); shards[i].reset();
shards[i].length = shard_length(); shards[i].length = shard_length();
shards[i].x = shard_x(i); shards[i].x = shard_x(i);
@ -126,8 +132,11 @@ function draw_clock(){
shards[i].y = 50; shards[i].y = 50;
} }
} }
shards[i].add(); // If its still visble then add to the shard and show to screen
shards[i].show(); if(visible){
shards[i].add();
shards[i].show();
}
} }
var now = new Date(); var now = new Date();
// draw time. Have to draw time on every loop // draw time. Have to draw time on every loop