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var selection = (function(){
var creating = false, moving = false, copying = false
var selection_canvas = new Matrix (1, 1, function(x,y){
var lex = new Lex (x,y)
lex.build()
return lex
})
var selector_el = document.createElement("div")
selector_el.className = "selector_el"
selection_canvas.append(selector_el)
document.body.appendChild(selector_el)
// in selection mode..
// - we start by clicking the canvas. this positions the selection, and copies
// the character
// - then we drag down and to the right. this resizes the selection and pushes new
// rows and columns. each of these copies the character underneath.
// - on mouseup, the selection is locked. then..
// - drag the selection to move it -- this "cuts" it and leaves a blank space on the canvas.
// - shift-drag the selection to copy it
var a = [0, 0]
var b = [0, 0]
var c = [0, 0]
var d = [0, 0]
function reset () {
a[0] = a[1] = b[0] = b[1] = 0
}
function left (a,b) { return min(a[0],b[0]) }
function top (a,b) { return min(a[1],b[1]) }
function right (a,b) { return max(a[0],b[0]) }
function bottom (a,b) { return max(a[1],b[1]) }
function width (a,b) { return abs(a[0]-b[0])+1 }
function height (a,b) { return abs(a[1]-b[1])+1 }
function mag_x (a,b) { return a[0]-b[0] }
function mag_y (a,b) { return a[1]-b[1] }
function orient (a,b) {
var l = left(a,b), m = top(a,b), n = right(a,b), o = bottom(a,b)
a[0] = l ; a[1] = m ; b[0] = n ; b[1] = o
}
function contains (a,b,point) {
var contains_x = a[0] <= point[0] && point[0] <= b[0]
var contains_y = a[1] <= point[1] && point[1] <= b[1]
return (contains_x && contains_y)
}
function reposition (aa, bb) {
aa = aa || a
bb = bb || b
var cell = canvas.aa[top(aa, bb)][left(aa, bb)].span
var cell_left = cell.offsetLeft
var cell_top = cell.offsetTop
var cell_width = cell.offsetWidth
var cell_height = cell.offsetHeight
var w = width(aa, bb)
var h = height(aa, bb)
selector_el.style.top = (cell_top-1) + "px"
selector_el.style.left = (cell_left-1) + "px"
selector_el.style.width = (cell_width*w+1) + "px"
selector_el.style.height = (cell_height*h+1) + "px"
}
function down (e, lex, point){
if ( ! contains(a,b,point) ) {
copying = false
moving = false
creating = true
a[0] = point[0]
a[1] = point[1]
b[0] = point[0]
b[1] = point[1]
reposition(a,b)
selection.hidden = false
selector_el.classList.add("creating")
} else {
copying = false
moving = true
creating = false
c[0] = point[0]
c[1] = point[1]
d[0] = point[0]
d[1] = point[1]
}
show()
selector_el.classList.remove("dragging")
}
function move (e, lex, point){
if (creating) {
b[0] = point[0]
b[1] = point[1]
reposition(a,b)
}
else if (moving) {
d[0] = point[0]
d[1] = point[1]
var dx = - clamp( mag_x(c,d), b[0] - canvas.w + 1, a[0] )
var dy = - clamp( mag_y(c,d), b[1] - canvas.h + 1, a[1] )
reposition( [ a[0] + dx, a[1] + dy ], [ b[0] + dx, b[1] + dy ])
}
else if (copying) {
}
}
function up (e) {
if (creating) {
orient(a,b)
selection_canvas.resize(width(a,b), height(a,b))
reposition(a,b)
blit.copy_from( canvas, selection_canvas, a[0], a[1] )
selection_canvas.build()
selector_el.classList.remove("creating")
}
if (moving) {
var dx = - clamp( mag_x(c,d), b[0] - canvas.w + 1, a[0] )
var dy = - clamp( mag_y(c,d), b[1] - canvas.h + 1, a[1] )
a[0] += dx
a[1] += dy
b[0] += dx
b[1] += dy
blit.copy_to( canvas, selection_canvas, a[0], a[1] )
}
if (copying) {
}
creating = moving = copying = false
selector_el.classList.remove("dragging")
}
function show () {
selecting = true
}
function hide () {
reset()
selector_el.style.top = "-9999px"
selector_el.style.left = "-9999px"
selector_el.style.width = "0px"
selector_el.style.height = "0px"
creating = moving = copying = false
selection.hidden = true
selecting = false
}
var selection = {}
selection.reposition = reposition
selection.down = down
selection.move = move
selection.up = up
selection.canvas = selection_canvas
selection.show = show
selection.hide = hide
selection.hidden = true
return selection
})()
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