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286 lines
6.8 KiB
286 lines
6.8 KiB
2 years ago
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( function () {
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/**
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* Ascii generation is based on http://www.nihilogic.dk/labs/jsascii/
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* Maybe more about this later with a blog post at http://lab4games.net/zz85/blog
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*
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* 16 April 2012 - @blurspline
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*/
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class AsciiEffect {
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constructor( renderer, charSet = ' .:-=+*#%@', options = {} ) {
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// ' .,:;=|iI+hHOE#`$';
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// darker bolder character set from https://github.com/saw/Canvas-ASCII-Art/
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// ' .\'`^",:;Il!i~+_-?][}{1)(|/tfjrxnuvczXYUJCLQ0OZmwqpdbkhao*#MW&8%B@$'.split('');
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// Some ASCII settings
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const bResolution = ! options[ 'resolution' ] ? 0.15 : options[ 'resolution' ]; // Higher for more details
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const iScale = ! options[ 'scale' ] ? 1 : options[ 'scale' ];
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const bColor = ! options[ 'color' ] ? false : options[ 'color' ]; // nice but slows down rendering!
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const bAlpha = ! options[ 'alpha' ] ? false : options[ 'alpha' ]; // Transparency
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const bBlock = ! options[ 'block' ] ? false : options[ 'block' ]; // blocked characters. like good O dos
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const bInvert = ! options[ 'invert' ] ? false : options[ 'invert' ]; // black is white, white is black
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const strResolution = 'low';
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let width, height;
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const domElement = document.createElement( 'div' );
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domElement.style.cursor = 'default';
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const oAscii = document.createElement( 'table' );
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domElement.appendChild( oAscii );
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let iWidth, iHeight;
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let oImg;
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this.setSize = function ( w, h ) {
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width = w;
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height = h;
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renderer.setSize( w, h );
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initAsciiSize();
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};
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this.render = function ( scene, camera ) {
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renderer.render( scene, camera );
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asciifyImage( renderer, oAscii );
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};
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this.domElement = domElement; // Throw in ascii library from http://www.nihilogic.dk/labs/jsascii/jsascii.js
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/*
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* jsAscii 0.1
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* Copyright (c) 2008 Jacob Seidelin, jseidelin@nihilogic.dk, http://blog.nihilogic.dk/
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* MIT License [http://www.nihilogic.dk/licenses/mit-license.txt]
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*/
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function initAsciiSize() {
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iWidth = Math.round( width * fResolution );
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iHeight = Math.round( height * fResolution );
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oCanvas.width = iWidth;
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oCanvas.height = iHeight; // oCanvas.style.display = "none";
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// oCanvas.style.width = iWidth;
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// oCanvas.style.height = iHeight;
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oImg = renderer.domElement;
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if ( oImg.style.backgroundColor ) {
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oAscii.rows[ 0 ].cells[ 0 ].style.backgroundColor = oImg.style.backgroundColor;
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oAscii.rows[ 0 ].cells[ 0 ].style.color = oImg.style.color;
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}
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oAscii.cellSpacing = 0;
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oAscii.cellPadding = 0;
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const oStyle = oAscii.style;
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oStyle.display = 'inline';
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oStyle.width = Math.round( iWidth / fResolution * iScale ) + 'px';
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oStyle.height = Math.round( iHeight / fResolution * iScale ) + 'px';
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oStyle.whiteSpace = 'pre';
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oStyle.margin = '0px';
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oStyle.padding = '0px';
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oStyle.letterSpacing = fLetterSpacing + 'px';
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oStyle.fontFamily = strFont;
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oStyle.fontSize = fFontSize + 'px';
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oStyle.lineHeight = fLineHeight + 'px';
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oStyle.textAlign = 'left';
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oStyle.textDecoration = 'none';
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}
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const aDefaultCharList = ' .,:;i1tfLCG08@'.split( '' );
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const aDefaultColorCharList = ' CGO08@'.split( '' );
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const strFont = 'courier new, monospace';
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const oCanvasImg = renderer.domElement;
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const oCanvas = document.createElement( 'canvas' );
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if ( ! oCanvas.getContext ) {
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return;
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}
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const oCtx = oCanvas.getContext( '2d' );
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if ( ! oCtx.getImageData ) {
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return;
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}
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let aCharList = bColor ? aDefaultColorCharList : aDefaultCharList;
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if ( charSet ) aCharList = charSet;
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let fResolution = 0.5;
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switch ( strResolution ) {
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case 'low':
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fResolution = 0.25;
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break;
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case 'medium':
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fResolution = 0.5;
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break;
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case 'high':
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fResolution = 1;
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break;
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}
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if ( bResolution ) fResolution = bResolution; // Setup dom
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const fFontSize = 2 / fResolution * iScale;
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const fLineHeight = 2 / fResolution * iScale; // adjust letter-spacing for all combinations of scale and resolution to get it to fit the image width.
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let fLetterSpacing = 0;
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if ( strResolution == 'low' ) {
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switch ( iScale ) {
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case 1:
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fLetterSpacing = - 1;
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break;
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case 2:
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case 3:
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fLetterSpacing = - 2.1;
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break;
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case 4:
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fLetterSpacing = - 3.1;
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break;
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case 5:
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fLetterSpacing = - 4.15;
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break;
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}
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}
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if ( strResolution == 'medium' ) {
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switch ( iScale ) {
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case 1:
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fLetterSpacing = 0;
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break;
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case 2:
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fLetterSpacing = - 1;
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break;
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case 3:
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fLetterSpacing = - 1.04;
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break;
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case 4:
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case 5:
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fLetterSpacing = - 2.1;
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break;
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}
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}
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if ( strResolution == 'high' ) {
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switch ( iScale ) {
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case 1:
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case 2:
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fLetterSpacing = 0;
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break;
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case 3:
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case 4:
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case 5:
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fLetterSpacing = - 1;
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break;
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}
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} // can't get a span or div to flow like an img element, but a table works?
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// convert img element to ascii
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function asciifyImage( canvasRenderer, oAscii ) {
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oCtx.clearRect( 0, 0, iWidth, iHeight );
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oCtx.drawImage( oCanvasImg, 0, 0, iWidth, iHeight );
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const oImgData = oCtx.getImageData( 0, 0, iWidth, iHeight ).data; // Coloring loop starts now
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let strChars = ''; // console.time('rendering');
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for ( let y = 0; y < iHeight; y += 2 ) {
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for ( let x = 0; x < iWidth; x ++ ) {
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const iOffset = ( y * iWidth + x ) * 4;
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const iRed = oImgData[ iOffset ];
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const iGreen = oImgData[ iOffset + 1 ];
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const iBlue = oImgData[ iOffset + 2 ];
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const iAlpha = oImgData[ iOffset + 3 ];
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let iCharIdx;
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let fBrightness;
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fBrightness = ( 0.3 * iRed + 0.59 * iGreen + 0.11 * iBlue ) / 255; // fBrightness = (0.3*iRed + 0.5*iGreen + 0.3*iBlue) / 255;
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if ( iAlpha == 0 ) {
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// should calculate alpha instead, but quick hack :)
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//fBrightness *= (iAlpha / 255);
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fBrightness = 1;
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}
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iCharIdx = Math.floor( ( 1 - fBrightness ) * ( aCharList.length - 1 ) );
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if ( bInvert ) {
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iCharIdx = aCharList.length - iCharIdx - 1;
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} // good for debugging
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//fBrightness = Math.floor(fBrightness * 10);
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//strThisChar = fBrightness;
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let strThisChar = aCharList[ iCharIdx ];
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if ( strThisChar === undefined || strThisChar == ' ' ) strThisChar = ' ';
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if ( bColor ) {
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strChars += '<span style=\'' + 'color:rgb(' + iRed + ',' + iGreen + ',' + iBlue + ');' + ( bBlock ? 'background-color:rgb(' + iRed + ',' + iGreen + ',' + iBlue + ');' : '' ) + ( bAlpha ? 'opacity:' + iAlpha / 255 + ';' : '' ) + '\'>' + strThisChar + '</span>';
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} else {
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strChars += strThisChar;
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}
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}
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strChars += '<br/>';
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}
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oAscii.innerHTML = '<tr><td>' + strChars + '</td></tr>'; // console.timeEnd('rendering');
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// return oAscii;
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}
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}
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}
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THREE.AsciiEffect = AsciiEffect;
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} )();
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