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csvContour.js
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csvContour.js
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/*csvContour
* csvContour.js
*===================================================================
* Copyright (c) 2020 Yuji SODE <yuji.sode@gmail.com>
*
* This software is released under the MIT License.
* See LICENSE or http://opensource.org/licenses/mit-license.php
*===================================================================
* Tool to draw text contour map
* This is implementation of "csvContour.tcl" in JavaScript
*--------------------------------------------------------------------
*
*=== Synopsis ===
* - `csvContour(csvMap?,void?);`
* function that returns a text contour map
* - csvMap: a numerical csv text map, that is composed of numerical values, comma (`,`) and newline character (Unicode U+000A)
* - void: an optional value to express void, and 0.0 is default value
*===================================================================
*/
//
//function that returns a text contour map
function csvContour(csvMap,VOID){
// - csvMap: a numerical csv text map, that is composed of numerical values, comma (`,`) and newline character (Unicode U+000A)
// - VOID: an optional value to express void, and 0.0 is default value
//======
VOID=!VOID?0.0:VOID;
var slf=this.window,d=csvMap.split(/\n/),map=[],c0=0,c1=0,c2=0,c3=0,h=d.length,w0=0,w=0,x=0,y=0,rules={},R='';
//
rules=contourChars();
//map is 2d array
while(y<h){
//
//estimating max width
w0=d[y].split(/,/).length;
w=w0>w?w0:w;
//
map.push(d[y].split(/,/));
y+=1;
};
y=0;
/*
* -----------------------------------------
* right down neighborhood: c0 and c1 to c3
* [c0|c1]
* [c2|c3]
*
* Vi = {c0!=ci?1:0}, and i = 1, 2 and 3
* rule: rules(`${V1}${V2}${V3}`)
* -----------------------------------------
*/
while(y<h){
x=0;while(x<w){
//
c0=map[y][x];
c0=!c0?VOID:c0;
c1=x<w-1?map[y][x+1]:VOID;
c1=!c1?VOID:c1;
c2=y<h-1?map[y+1][x]:VOID;
c2=!c2?VOID:c2;
c3=(y<h-1&&x<w-1)?map[y+1][x+1]:VOID;
c3=!c3?VOID:c3;
R+=rules[`${c0!=c1?1:0}${c0!=c2?1:0}${c0!=c3?1:0}`];
//
x+=1;
};
R+=y<h-1?'\n':'';
y+=1;
};
//
slf=d=map=c0=c1=c2=c3=h=w0=w=x=y=rules=null;
return R;
}