From d6076f20eadf7a10e10bae14b1136ebe7e71d58e Mon Sep 17 00:00:00 2001
From: Gabor Torok <gtorok@gtorok-m02.gateway.sonic.net>
Date: Tue, 1 Apr 2014 08:42:09 -0700
Subject: [PATCH] div-based renderer

---
 Makefile               |   1 +
 src/display/backend.js |   5 ++
 src/display/display.js |  13 ++++--
 src/display/tilediv.js | 104 +++++++++++++++++++++++++++++++++++++++++
 4 files changed, 119 insertions(+), 4 deletions(-)
 create mode 100644 src/display/tilediv.js

diff --git a/Makefile b/Makefile
index e86a7fd3..5dc9b247 100644
--- a/Makefile
+++ b/Makefile
@@ -12,6 +12,7 @@ SOURCES = 	src/rot.js \
 			src/display/rect.js \
 			src/display/hex.js \
 			src/display/tile.js \
+			src/display/tilediv.js \
 			src/rng.js \
 			src/stringgenerator.js \
 			src/eventqueue.js \
diff --git a/src/display/backend.js b/src/display/backend.js
index 90089d58..edf67142 100644
--- a/src/display/backend.js
+++ b/src/display/backend.js
@@ -6,6 +6,11 @@ ROT.Display.Backend = function(context) {
 	this._context = context;
 }
 
+ROT.Display.Backend.prototype.clear = function() {
+	this._context.fillStyle = this._options.bg;
+	this._context.fillRect(0, 0, this._context.canvas.width, this._context.canvas.height);
+}
+
 ROT.Display.Backend.prototype.compute = function(options) {
 }
 
diff --git a/src/display/display.js b/src/display/display.js
index 9dcffb65..76862f65 100644
--- a/src/display/display.js
+++ b/src/display/display.js
@@ -18,7 +18,13 @@
  */
 ROT.Display = function(options) {
 	var canvas = document.createElement("canvas");
-	this._context = canvas.getContext("2d");
+	if(options && options.layout == "tilediv") {
+		this._context = document.createElement("div");
+		this._context.id = "canvas";
+		this._context.style.background = options.bg;
+	} else {
+		this._context = canvas.getContext("2d");
+	}
 	this._data = {};
 	this._dirty = false; /* false = nothing, true = all, object = dirty cells */
 	this._options = {};
@@ -101,7 +107,7 @@ ROT.Display.prototype.getOptions = function() {
  * @returns {node} DOM node
  */
 ROT.Display.prototype.getContainer = function() {
-	return this._context.canvas;
+	return this._options && this._options.layout == "tilediv" ? this._context : this._context.canvas;
 }
 
 /**
@@ -219,8 +225,7 @@ ROT.Display.prototype._tick = function() {
 	if (!this._dirty) { return; }
 
 	if (this._dirty === true) { /* draw all */
-		this._context.fillStyle = this._options.bg;
-		this._context.fillRect(0, 0, this._context.canvas.width, this._context.canvas.height);
+		this._backend.clear();
 
 		for (var id in this._data) { /* redraw cached data */
 			this._draw(id, false);
diff --git a/src/display/tilediv.js b/src/display/tilediv.js
new file mode 100644
index 00000000..e4a84e6e
--- /dev/null
+++ b/src/display/tilediv.js
@@ -0,0 +1,104 @@
+/**
+ * @class Tile backend
+ * @private
+ */
+ROT.Display.Tilediv = function(context) {
+	ROT.Display.Rect.call(this, context);
+	this._options = {};
+}
+ROT.Display.Tilediv.extend(ROT.Display.Tile);
+
+ROT.Display.Tilediv.prototype.compute = function(options) {
+	this._options = options;
+	this._context.style.width = options.width * options.tileWidth + "px";
+	this._context.style.height = options.height * options.tileHeight + "px";
+}
+
+ROT.Display.Tilediv.MIN_LIGHT = 80;
+
+ROT.Display.Tilediv.prototype.draw = function(data, clearBefore) {
+	var x = data[0];
+	var y = data[1];
+	var ch = data[2];
+	var fg = data[3];
+	var bg = data[4];
+
+	var tileWidth = this._options.tileWidth;
+	var tileHeight = this._options.tileHeight;
+
+	var id = "" + x + "," + y;
+	var div = document.getElementById(id);
+	if(!div) {
+		div = this.createTileDiv(id, x, y, tileWidth, tileHeight);
+		this._context.appendChild(div);
+	}
+	var id_color = "c" + x + "," + y;
+	var div_color = document.getElementById(id_color);
+	if(!div_color) {
+		div_color = this.createColorDiv(id_color, x, y, tileWidth, tileHeight);
+		this._context.appendChild(div_color);
+	}
+
+	if (clearBefore) {
+		div.style.backgroundPosition = "0 0";
+		div.style.backgroundColor = "transparent";
+		div.style.color = "transparent";
+	}
+
+	// light
+	div_color.style.backgroundColor = fg;	
+	var fg_color = ROT.Color.fromString(div_color.style.backgroundColor);
+
+	// save color in the div for debugging
+	div_color.setAttribute("data-fg", div_color.style.backgroundColor);
+	div_color.setAttribute("data-fg_color", ROT.Color.toHex(fg_color));
+
+	// approximate alpha value from the color
+	var opacity = 0.5 +
+		(fg_color[0] < ROT.Display.Tilediv.MIN_LIGHT ? 0.1666 * (1 - fg_color[0] / ROT.Display.Tilediv.MIN_LIGHT) : 0) +
+		(fg_color[1] < ROT.Display.Tilediv.MIN_LIGHT ? 0.1666 * (1 - fg_color[1] / ROT.Display.Tilediv.MIN_LIGHT) : 0) +
+		(fg_color[2] < ROT.Display.Tilediv.MIN_LIGHT ? 0.1666 * (1 - fg_color[2] / ROT.Display.Tilediv.MIN_LIGHT) : 0);
+	div_color.style.opacity = opacity;
+
+	if (!ch) { return; }
+
+	var chars = [].concat(ch);
+	for (var i=0;i<chars.length;i++) {
+		var tile = this._options.tileMap[chars[i]];
+		if (!tile) { throw new Error("Char '" + chars[i] + "' not found in tileMap"); }
+
+		div.style.backgroundPosition = "-" + tile[0] + "px -" + tile[1] + "px";
+	}
+}
+
+ROT.Display.Tilediv.prototype.createTileDiv = function(id, x, y, tileWidth, tileHeight) {
+	div = document.createElement("div");
+	div.id = id;
+	div.className = "tile";
+	div.style.position = "absolute";
+	div.style.left = (x*tileWidth) + "px";
+	div.style.top = (y*tileHeight) + "px";
+	div.style.width = tileWidth + "px";
+	div.style.height = tileHeight + "px";
+	div.style.backgroundImage = "url(" + this._options.tileSet.src + ")";
+	div.style.zIndex = 10;
+	div.style.backgroundColor = "inherit";
+	return div;
+}
+
+ROT.Display.Tilediv.prototype.createColorDiv = function(id, x, y, tileWidth, tileHeight) {
+	div_color = document.createElement("div");
+	div_color.id = id;
+	div_color.className = "color";
+	div_color.style.position = "absolute";
+	div_color.style.left = (x*tileWidth) + "px";
+	div_color.style.top = (y*tileHeight) + "px";
+	div_color.style.width = tileWidth + "px";
+	div_color.style.height = tileHeight + "px";
+	div_color.style.zIndex = 20;
+	return div_color;
+}
+
+ROT.Display.Tilediv.prototype.clear = function() {
+}
+