editor/editor.js
function editorCanvas(height, palette, preview, codepage, retina) {
"use strict";
var canvas, ctx, imageData, image, undoQueue, overlays, mirror;
canvas = ElementHelper.create("canvas", {"width": retina ? 1280 : 640, "height": retina ? height * 32 : height * 16, "style": {"width": "640px", "height": (height * 16) + "px", "verticalAlign": "bottom"}});
ctx = canvas.getContext("2d");
imageData = ctx.createImageData(retina ? 16 : 8, retina ? 32 : 16);
image = new Uint8Array(80 * height * 3);
undoQueue = [];
overlays = {};
mirror = false;
function draw(charCode, x, y, fg, bg) {
imageData.data.set(codepage.bigFont(charCode, fg, bg), 0);
ctx.putImageData(imageData, x * imageData.width, y * imageData.height);
preview.draw(charCode, x, y, fg, bg);
}
function update(index) {
draw(image[index], (index / 3) % 80, Math.floor(index / 240), image[index + 1], image[index + 2]);
}
function redraw() {
var i;
for (i = 0; i < image.length; i += 3) {
update(i);
}
}
function set(charCode, fg, bg, index) {
var x, mirrorIndex;
undoQueue[0].push([image[index], image[index + 1], image[index + 2], index]);
image[index] = charCode;
image[index + 1] = fg;
image[index + 2] = bg;
update(index);
if (mirror) {
x = (index % 240) / 3;
if (x > 39) {
mirrorIndex = (x - 40);
mirrorIndex = index - (mirrorIndex ? mirrorIndex * 2 + 1 : 1) * 3;
} else {
mirrorIndex = (39 - x);
mirrorIndex = index + (mirrorIndex ? mirrorIndex * 2 + 1 : 1) * 3;
}
undoQueue[0].push([image[mirrorIndex], image[mirrorIndex + 1], image[mirrorIndex + 2], mirrorIndex]);
image[mirrorIndex] = charCode;
image[mirrorIndex + 1] = fg;
image[mirrorIndex + 2] = bg;
update(mirrorIndex);
}
}
function setTextBlock(block, charCode, fg, bg) {
set(charCode, fg, bg, block.index);
}
function getBlock(blockX, blockY) {
var index, textY, modBlockY, charCode, foreground, background, isBlocky, upperBlockColor, lowerBlockColor;
textY = Math.floor(blockY / 2);
modBlockY = blockY % 2;
index = (textY * 80 + blockX) * 3;
charCode = image[index];
foreground = image[index + 1];
background = image[index + 2];
switch (charCode) {
case codepage.NULL:
case codepage.SPACE:
case codepage.NO_BREAK_SPACE:
upperBlockColor = background;
lowerBlockColor = background;
isBlocky = true;
break;
case codepage.UPPER_HALF_BLOCK:
upperBlockColor = foreground;
lowerBlockColor = background;
isBlocky = true;
break;
case codepage.LOWER_HALF_BLOCK:
upperBlockColor = background;
lowerBlockColor = foreground;
isBlocky = true;
break;
case codepage.FULL_BLOCK:
upperBlockColor = foreground;
lowerBlockColor = foreground;
isBlocky = true;
break;
default:
if (foreground === background) {
isBlocky = true;
upperBlockColor = foreground;
lowerBlockColor = foreground;
} else {
isBlocky = false;
}
}
return {
"index": index,
"textX": blockX,
"textY": textY,
"blockX": blockX,
"blockY": blockY,
"isUpperHalf": (modBlockY === 0),
"isLowerHalf": (modBlockY === 1),
"charCode": charCode,
"foreground": foreground,
"background": background,
"isBlocky": isBlocky,
"upperBlockColor": upperBlockColor,
"lowerBlockColor": lowerBlockColor
};
}
function getTextBlock(textX, textY) {
return getBlock(textX, textY * 2);
}
function setBlock(block, color) {
if (block.isBlocky) {
if (block.isUpperHalf) {
if (block.lowerBlockColor === color) {
set(codepage.FULL_BLOCK, color, block.background, block.index);
} else {
set(codepage.UPPER_HALF_BLOCK, color, block.lowerBlockColor, block.index);
}
} else {
if (block.upperBlockColor === color) {
set(codepage.FULL_BLOCK, color, block.background, block.index);
} else {
set(codepage.LOWER_HALF_BLOCK, color, block.upperBlockColor, block.index);
}
}
} else {
if (block.isUpperHalf) {
set(codepage.UPPER_HALF_BLOCK, color, block.background, block.index);
} else {
set(codepage.LOWER_HALF_BLOCK, color, block.background, block.index);
}
}
}
function blockLine(from, to, callback) {
var x0, y0, x1, y1, dx, dy, sx, sy, err, e2;
x0 = from.blockX;
y0 = from.blockY;
x1 = to.blockX;
y1 = to.blockY;
dx = Math.abs(x1 - x0);
sx = (x0 < x1) ? 1 : -1;
dy = Math.abs(y1 - y0);
sy = (y0 < y1) ? 1 : -1;
err = ((dx > dy) ? dx : -dy) / 2;
while (true) {
callback(getBlock(x0, y0));
if (x0 === x1 && y0 === y1) {
break;
}
e2 = err;
if (e2 > -dx) {
err -= dy;
x0 += sx;
}
if (e2 < dy) {
err += dx;
y0 += sy;
}
}
}
function setChar(block, charCode, color) {
if (block.isBlocky) {
if (block.isUpperHalf) {
set(charCode, color, block.upperBlockColor, block.index);
} else {
set(charCode, color, block.lowerBlockColor, block.index);
}
} else {
set(charCode, color, block.background, block.index);
}
}
function resolveConflict(block, colorBias, color) {
block = getBlock(block.blockX, block.blockY);
if (block.background > 7) {
if (block.isBlocky) {
if (block.foreground > 7) {
if (colorBias) {
if (block.upperBlockColor === color && block.lowerBlockColor === color) {
set(codepage.FULL_BLOCK, color, 0, block.index);
} else if (block.upperBlockColor === color) {
set(codepage.UPPER_HALF_BLOCK, block.upperBlockColor, block.lowerBlockColor - 8, block.index);
} else if (block.lowerBlockColor === color) {
set(codepage.LOWER_HALF_BLOCK, block.lowerBlockColor, block.upperBlockColor - 8, block.index);
} else {
set(image[block.index], block.foreground, block.background - 8, block.index);
}
} else {
if (block.upperBlockColor === color && block.lowerBlockColor === color) {
set(codepage.FULL_BLOCK, color, 0, block.index);
} else if (block.upperBlockColor === color) {
set(codepage.LOWER_HALF_BLOCK, block.lowerBlockColor, block.upperBlockColor - 8, block.index);
} else if (block.lowerBlockColor === color) {
set(codepage.UPPER_HALF_BLOCK, block.upperBlockColor, block.lowerBlockColor - 8, block.index);
} else {
set(image[block.index], block.foreground, block.background - 8, block.index);
}
}
} else {
if ((block.upperBlockColor === block.background) && (block.lowerBlockColor === block.background)) {
set(codepage.FULL_BLOCK, block.background, block.foreground, block.index);
} else if (block.upperBlockColor === block.background) {
set(codepage.UPPER_HALF_BLOCK, block.background, block.foreground, block.index);
} else if (block.lowerBlockColor === block.background) {
set(codepage.LOWER_HALF_BLOCK, block.background, block.foreground, block.index);
} else {
set(codepage.FULL_BLOCK, block.foreground, block.background - 8, block.index);
}
}
} else {
set(image[block.index], block.foreground, block.background - 8, block.index);
}
}
}
function resolveConflicts(colorBias, color) {
var i;
for (i = 0; i < image.length; i += 3) {
resolveConflict({"blockX": (i / 3) % 80, "blockY": Math.floor(i / 3 / 80) * 2, "index": i}, colorBias, color);
}
}
function startListening() {
palette.startListening();
}
function stopListening() {
palette.stopListening();
}
function clearImage() {
var i;
for (i = 0; i < image.length; i += 3) {
image[i] = 0;
image[i + 1] = 7;
image[i + 2] = 0;
}
redraw();
}
function init(divEditor) {
palette.init();
clearImage();
function dispatchEvent(type, x, y, shiftKey, altKey) {
var coord, evt, blockX, blockY;
blockX = Math.floor((x - divEditor.offsetLeft) / 8);
blockY = Math.floor((y - divEditor.offsetTop) / 8);
coord = getBlock(blockX, blockY);
coord.shiftKey = shiftKey;
coord.altKey = altKey;
evt = new CustomEvent(type, {"detail": coord});
canvas.dispatchEvent(evt);
}
divEditor.addEventListener("mousedown", function (evt) {
evt.preventDefault();
dispatchEvent("canvasDown", evt.pageX, evt.pageY, evt.shiftKey, evt.altKey);
}, false);
divEditor.addEventListener("mouseup", function (evt) {
evt.preventDefault();
dispatchEvent("canvasUp", evt.pageX, evt.pageY, evt.shiftKey, evt.altKey);
}, false);
divEditor.addEventListener("mousemove", function (evt) {
var mouseButton;
evt.preventDefault();
mouseButton = (evt.buttons !== undefined) ? evt.buttons : evt.which;
if (mouseButton) {
dispatchEvent("canvasDrag", evt.pageX, evt.pageY, evt.shiftKey, evt.altKey);
} else {
dispatchEvent("canvasMove", evt.pageX, evt.pageY);
}
}, false);
startListening();
canvas.style.position = "absolute";
canvas.style.left = "0px";
canvas.style.top = "0px";
divEditor.appendChild(canvas);
}
function undo() {
var values, i;
if (undoQueue.length) {
values = undoQueue.shift();
for (i = values.length - 1; i >= 0; --i) {
image[values[i][3]] = values[i][0];
image[values[i][3] + 1] = values[i][1];
image[values[i][3] + 2] = values[i][2];
update(values[i][3]);
}
return true;
}
return false;
}
function takeUndoSnapshot() {
if (undoQueue.unshift([]) > 1000) {
undoQueue.pop();
}
}
function clearUndoHistory() {
while (undoQueue.length) {
undoQueue.pop();
}
}
function removeOverlay(uid) {
document.getElementById("editor").removeChild(overlays[uid]);
delete overlays[uid];
}
function addOverlay(overlayCanvas, uid) {
if (overlays[uid]) {
removeOverlay(uid);
}
overlayCanvas.style.position = "absolute";
overlayCanvas.style.left = "0px";
overlayCanvas.style.top = "0px";
document.getElementById("editor").appendChild(overlayCanvas);
overlays[uid] = overlayCanvas;
}
function turnOnMirroring() {
mirror = true;
}
function turnOffMirroring() {
mirror = false;
}
return {
"height": height,
"init": init,
"canvas": canvas,
"clearImage": clearImage,
"redraw": redraw,
"image": image,
"getBlock": getBlock,
"setBlock": setBlock,
"getTextBlock": getTextBlock,
"setTextBlock": setTextBlock,
"blockLine": blockLine,
"setChar": setChar,
"resolveConflict": resolveConflict,
"resolveConflicts": resolveConflicts,
"takeUndoSnapshot": takeUndoSnapshot,
"undo": undo,
"clearUndoHistory": clearUndoHistory,
"turnOnMirroring": turnOnMirroring,
"turnOffMirroring": turnOffMirroring,
"addOverlay": addOverlay,
"removeOverlay": removeOverlay,
"stopListening": stopListening,
"startListening": startListening
};
}
