1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
|
var undo = (function(){
var max_states = 200;
// undotimetotal = 0;
var stack = {undo: [], redo: []};
var current_undo = null;
var dom = {undo: undo_el, redo: redo_el};
dom.undo.is_visible = dom.redo.is_visible = false
var LexState = function(lex){
this.fg = lex.fg;
this.bg = lex.bg;
this.char = lex.char;
this.opacity = lex.opacity;
};
var update_dom_visibility = function(type){
var el = dom[type]
if (el.is_visible){
if (stack[type].length === 0) {
el.classList.add('hidden')
el.is_visible = false
}
} else if (stack[type].length > 0){
el.classList.remove('hidden')
el.is_visible = true
}
}
var update_dom = function(){
update_dom_visibility('undo')
update_dom_visibility('redo')
}
// state is an undo or redo state that might contain these props
// { lexs: {'0,0': LexState, ...}, // for sparse lex changes (eg brush, fill)
// focus: {x:, y: },
// size: {w:, h: },
// rects: [{x:, y:, w:, h:, lexs: [LexState, ...]}, ...]
// }
var new_state = function(){
var state = {lexs:{}};
save_focus(canvas.focus_x, canvas.focus_y, state)
return state
}
var new_redo = function(){
return new_state()
}
var new_undo = function(){
current_undo = new_state()
stack.redo = []
stack.undo.push(current_undo)
if (stack.undo.length > max_states) stack.undo.shift();
update_dom()
return current_undo
}
var save_focus = function(x, y, state){
state = state || current_undo
state.focus = {x:x, y:y}
}
var save_size = function(w, h, state){
state = state || current_undo
state.size = {w:w, h:h};
}
// the reason for stringifying the x y coords is so that each
// coordinate is saved only once in an undo state.
// otherwise there would be problems with, eg, a brush stroke
// that passed over the same grid cell twice.
var save_lex = function(x, y, lex, state){
// var start = Date.now()
state = state || current_undo
var lexs = state.lexs;
var xy = x + "," + y;
if (xy in lexs) return;
lexs[xy] = new LexState(lex)
// undotimetotal += Date.now() - start
}
var save_focused_lex = function(state){
state = state || current_undo
var x = canvas.focus_x
var y = canvas.focus_y
save_lex(x, y, canvas.aa[y][x], state)
}
var save_rect = function(xpos, ypos, w, h, state){
if (w === 0 || h === 0) return;
state = state || current_undo;
state.rects = state.rects || []
var aa = canvas.aa;
var rect = {x: xpos, y: ypos, w: w, h: h, lexs: []}
var lexs = rect.lexs
var xlen = xpos + w
var ylen = ypos + h
for (var y = ypos; y < ylen; y++){
var aay = aa[y]
for (var x = xpos; x < xlen; x++){
lexs.push(new LexState(aay[x]))
}
}
state.rects.push(rect)
}
var save_resize = function(w, h, old_w, old_h, state){
state = state || current_undo
save_size(old_w, old_h, state)
if (old_w > w){
// .---XX
// | XX
// |___XX
save_rect(w, 0, old_w - w, old_h, state)
if (old_h > h){
// .----.
// | |
// XXXX_|
save_rect(0, h, w, old_h - h, state)
}
} else if (old_h > h){
// .----.
// | |
// XXXXXX
save_rect(0, h, old_w, old_h - h, state)
}
}
var restore_state = function(state){
// all redo states will have a cached undo state on them
// an undo state might have a cached redo state
// if it doesn't have one, generate one
var make_redo = ! ('redo' in state || 'undo' in state);
var aa = canvas.aa
var lex, lexs;
if (make_redo){
state.redo = new_redo()
// copy saved rects that intersect with current canvas size
// important to do this before resizing canvas
if ('rects' in state){
for (var ri=0, rect; rect=state.rects[ri]; ri++){
if (rect.x >= canvas.w ||
rect.y >= canvas.h) continue;
var w = Math.min(rect.w, canvas.w - rect.x)
var h = Math.min(rect.h, canvas.h - rect.y)
save_rect(rect.x, rect.y, w, h, state.redo)
}
}
if ('size' in state){
save_resize(state.size.w, state.size.h, canvas.w, canvas.h, state.redo)
}
}
if ('size' in state){
canvas.resize(state.size.w, state.size.h, true);
}
if ('rects' in state){
for (var ri=0, rect; rect=state.rects[ri]; ri++){
lexs = rect.lexs
for (var li=0; lex=lexs[li]; li++){
var x = (li % rect.w) + rect.x
var y = ((li / rect.w)|0) + rect.y
aa[y][x].assign(lex)
}
}
}
lexs = state.lexs
for (var key in lexs){
var xy = key.split(',');
lex = aa[xy[1]][xy[0]]
if (make_redo)
save_lex(xy[0], xy[1], lex, state.redo)
lex.assign(lexs[key])
}
if ('focus' in state){
canvas.focus_x = state.focus.x
canvas.focus_y = state.focus.y
if (current_canvas === canvas){
canvas.focus()
}
}
}
var undo = function(){
var state = stack.undo.pop();
if (!state) return;
restore_state(state)
// now take the applied undo state and store it on the redo state
// and push the redo state to the redo stack
state.redo.undo = state
stack.redo.push(state.redo)
delete state.redo
update_dom()
}
var redo = function(){
var state = stack.redo.pop();
if (!state) return;
restore_state(state)
state.undo.redo = state
stack.undo.push(state.undo)
delete state.undo
update_dom()
}
return {
stack: stack,
new: new_undo,
// new_redo: new_redo,
save_focus: save_focus,
save_size: save_size,
save_lex: save_lex,
save_focused_lex: save_focused_lex,
save_rect: save_rect,
save_resize: save_resize,
undo: undo,
redo: redo
}
})()
|
