mirror of git://git.acid.vegas/asciiblaster.git
106 lines
2.5 KiB
JavaScript
106 lines
2.5 KiB
JavaScript
var blit = (function(){
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var blit = {}
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blit.and = blit.atop = function(A, B, x, y){
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x = x || 0 ; y = y || 0
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B.forEach(function(lex, u, v){
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var cell = A.getCell(u+x, v+y)
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if (cell && lex.opacity > 0) {
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cell.assign(lex)
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}
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})
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}
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blit.or = blit.under = function(A, B, x, y){
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x = x || 0 ; y = y || 0
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B.forEach(function(lex, u, v){
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var cell = A.getCell(u+x, v+y)
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if (cell && cell.opacity == 0) {
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cell.assign(lex)
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}
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})
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}
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// copy the region of A beginning at x,y into B
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blit.copy_from = function(A, B, x, y){
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x = x || 0 ; y = y || 0
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B.forEach(function(lex, u, v){
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var cell = A.getCell(u+x, v+y)
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if (cell) {
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lex.assign(cell)
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}
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})
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}
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blit.copy_toroidal_from = function(A, B, x, y){
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x = x || 0 ; y = y || 0
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B.forEach(function(lex, u, v){
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var cell = A.get(u+x, v+y)
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if (cell) {
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lex.assign(cell)
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}
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})
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}
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blit.copy_to = function(A, B, x, y){
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x = x || 0 ; y = y || 0
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B.forEach(function(lex, u, v){
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var cell = A.getCell(u+x, v+y)
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if (cell) {
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cell.assign(lex)
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}
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})
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}
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blit.invert = function(A, B, x, y){
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x = x || 0 ; y = y || 0
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B.forEach(function(lex, u, v){
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var cell = A.getCell(u+x, v+y)
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if (cell && lex.opacity > 0) {
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cell.fg = get_inverse(cell.fg)
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cell.bg = get_inverse(cell.bg)
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}
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})
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}
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var distance_rect = function(x, y, ratio){
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return Math.sqrt((Math.pow(y * ratio, 2)) + Math.pow(x, 2))
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}
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var distance_square = function(x, y, ratio){
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return Math.sqrt((Math.pow(y * ratio, 2)) + Math.pow(x * ratio, 2))
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}
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blit.circle = function(A, lex){
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var hw = brush.w/2, hh = brush.h/2
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var ratio, distance
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if (brush.w === brush.h){
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distance = distance_square
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ratio = hw / hh * (brush.w === 3 || brush.w === 5 ? 1.2 : 1.05)
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} else {
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distance = distance_rect
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ratio = hw / hh
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}
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A.forEach(function(lex,x,y) {
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if (distance(x - hw + 0.5, y - hh + 0.5, ratio) > hw){
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lex.clear()
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}
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})
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}
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blit.cross = function(A, lex){
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A.forEach(function(lex,x,y) {
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if ((x+y)%2) {
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lex.clear()
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}
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})
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}
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blit.inverted_cross = function(A, lex){
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// 1x1 brush should still draw something
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if (A.w == 1 && A.h == 1) {
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return
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}
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A.forEach(function(lex,x,y) {
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if (!((x+y)%2)) {
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lex.clear()
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}
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})
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}
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blit.square = function(A, lex){
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// i.e. no transparency
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}
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return blit
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})()
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