svgedit/editor/svgcanvas.js

507 lines
13 KiB
JavaScript

var svgcanvas = null;
function SvgCanvas(c)
{
// private members
var container = c;
var svgns = "http://www.w3.org/2000/svg";
var svgdoc = c.ownerDocument;
var svgroot = svgdoc.createElementNS(svgns, "svg");
svgroot.setAttribute("width",640);
svgroot.setAttribute("height",480);
svgroot.setAttributeNS(null,"id","svgroot");
container.appendChild(svgroot);
var d_attr = null;
var started = false;
var obj_num = 1;
var start_x = null;
var start_y = null;
var current_mode = "path";
var current_fill = "none";
var current_stroke = "black";
var current_stroke_width = 1;
var current_stroke_style = "none";
var current_opacity = 1;
var current_stroke_opacity = 1;
var current_fill_opacity = 1;
var freehand_min_x = null;
var freehand_max_x = null;
var freehand_min_y = null;
var freehand_max_y = null;
var selected = null;
var events = {};
// private functions
var getId = function() {
return "svg_"+obj_num;
}
var call = function(event, arg) {
if (events[event]) {
return events[event](this,arg);
}
}
var assignAttributes = function(node, attrs) {
for (i in attrs) {
node.setAttributeNS(null, i, attrs[i]);
}
}
// remove unneeded attributes
// makes resulting SVG smaller
var cleanupElement = function(element) {
if (element.getAttribute('fill-opacity') == '1')
element.removeAttribute('fill-opacity');
if (element.getAttribute('opacity') == '1')
element.removeAttribute('opacity');
if (element.getAttribute('stroke') == 'none')
element.removeAttribute('stroke');
if (element.getAttribute('stroke-dasharray') == 'none')
element.removeAttribute('stroke-dasharray');
if (element.getAttribute('stroke-opacity') == '1')
element.removeAttribute('stroke-opacity');
if (element.getAttribute('stroke-width') == '1')
element.removeAttribute('stroke-width');
}
var addSvgElementFromJson = function(data) {
var shape = svgdoc.createElementNS(svgns, data.element);
assignAttributes(shape, data.attr);
cleanupElement(shape);
svgroot.appendChild(shape);
return shape;
}
var svgToString = function(elem, indent) {
var out = "";
if (elem) {
var attrs = elem.attributes;
var attr;
var i;
var childs = elem.childNodes;
// don't include scripts in output svg
if (elem.nodeName == "script") return "";
for (i=0; i<indent; i++) out += " ";
out += "<" + elem.nodeName;
for (i=attrs.length-1; i>=0; i--) {
attr = attrs.item(i);
// don't include events in output svg
if (attr.nodeName == "onload" ||
attr.nodeName == "onmousedown" ||
attr.nodeName == "onmousemove" ||
attr.nodeName == "onmouseup") continue;
out += " " + attr.nodeName + "=\"" + attr.nodeValue+ "\"";
}
if (elem.hasChildNodes()) {
out += ">\n";
indent++;
for (i=0; i<childs.length; i++)
{
if (childs.item(i).nodeType == 1) { // element node
out = out + svgToString(childs.item(i), indent);
} else if (childs.item(i).nodeType == 3) { // text node
for (j=0; j<indent; j++) out += " ";
out += childs.item(i).nodeValue + "\n";
}
}
indent--;
for (i=0; i<indent; i++) out += " ";
out += "</" + elem.nodeName + ">\n";
} else {
out += " />\n";
}
}
return out;
}
// public events
var mouseDown = function(evt)
{
var x = evt.pageX - container.offsetLeft;
var y = evt.pageY - container.offsetTop;
switch (current_mode) {
case "select":
started = true;
start_x = x;
start_y = y;
if (evt.target != svgroot)
selected = evt.target;
addSvgElementFromJson({
"element": "rect",
"attr": {
"x": x,
"y": y,
"width": 0,
"height": 0,
"id": getId(),
"fill": '#DBEBF9',
"stroke": '#CEE2F7',
"stroke-width": 1,
"fill-opacity": 0.5
}
});
break;
case "fhellipse":
case "fhrect":
case "path":
started = true;
d_attr = "M" + x + " " + y + " ";
addSvgElementFromJson({
"element": "path",
"attr": {
"d": d_attr,
"id": getId(),
"fill": "none",
"stroke": current_stroke,
"stroke-width": current_stroke_width,
"stroke-dasharray": current_stroke_style,
"stroke-opacity": current_stroke_opacity,
"opacity": current_opacity / 2
}
});
freehand_min_x = x;
freehand_max_x = x;
freehand_min_y = y;
freehand_max_y = y;
break;
case "square":
case "rect":
started = true;
start_x = x;
start_y = y;
addSvgElementFromJson({
"element": "rect",
"attr": {
"x": x,
"y": y,
"width": 0,
"height": 0,
"id": getId(),
"fill": current_fill,
"stroke": current_stroke,
"stroke-width": current_stroke_width,
"stroke-dasharray": current_stroke_style,
"stroke-opacity": current_stroke_opacity,
"fill-opacity": current_fill_opacity,
"opacity": current_opacity / 2
}
});
break;
case "line":
started = true;
addSvgElementFromJson({
"element": "line",
"attr": {
"x1": x,
"y1": y,
"x2": x,
"y2": y,
"id": getId(),
"stroke": current_stroke,
"stroke-width": current_stroke_width,
"stroke-dasharray": current_stroke_style,
"stroke-opacity": current_stroke_opacity,
"opacity": current_opacity / 2
}
});
break;
case "circle":
started = true;
addSvgElementFromJson({
"element": "circle",
"attr": {
"cx": x,
"cy": y,
"r": 0,
"id": getId(),
"fill": current_fill,
"stroke": current_stroke,
"stroke-width": current_stroke_width,
"stroke-dasharray": current_stroke_style,
"stroke-opacity": current_stroke_opacity,
"fill-opacity": current_fill_opacity,
"opacity": current_opacity / 2
}
});
break;
case "ellipse":
started = true;
addSvgElementFromJson({
"element": "ellipse",
"attr": {
"cx": x,
"cy": y,
"rx": 0,
"ry": 0,
"id": getId(),
"fill": current_fill,
"stroke": current_stroke,
"stroke-width": current_stroke_width,
"stroke-dasharray": current_stroke_style,
"stroke-opacity": current_stroke_opacity,
"fill-opacity": current_fill_opacity,
"opacity": current_opacity / 2
}
});
break;
case "delete":
var t = evt.target;
if (t == svgroot) return;
t.parentNode.removeChild(t);
call("deleted",t);
break;
}
}
var mouseMove = function(evt)
{
if (!started) return;
var x = evt.pageX - container.offsetLeft;
var y = evt.pageY - container.offsetTop;
var shape = svgdoc.getElementById(getId());
switch (current_mode)
{
case "line":
shape.setAttributeNS(null, "x2", x);
shape.setAttributeNS(null, "y2", y);
break;
case "square":
var size = Math.max( Math.abs(x - start_x), Math.abs(y - start_y) );
shape.setAttributeNS(null, "width", size);
shape.setAttributeNS(null, "height", size);
shape.setAttributeNS(null, "x", start_x < x ? start_x : start_x - size);
shape.setAttributeNS(null, "y", start_y < y ? start_y : start_y - size);
break;
case "select":
case "rect":
shape.setAttributeNS(null, "x", Math.min(start_x,x));
shape.setAttributeNS(null, "y", Math.min(start_y,y));
shape.setAttributeNS(null, "width", Math.abs(x-start_x));
shape.setAttributeNS(null, "height", Math.abs(y-start_y));
break;
case "circle":
var cx = shape.getAttributeNS(null, "cx");
var cy = shape.getAttributeNS(null, "cy");
var rad = Math.sqrt( (x-cx)*(x-cx) + (y-cy)*(y-cy) );
shape.setAttributeNS(null, "r", rad);
break;
case "ellipse":
var cx = shape.getAttributeNS(null, "cx");
var cy = shape.getAttributeNS(null, "cy");
shape.setAttributeNS(null, "rx", Math.abs(x - cx) );
shape.setAttributeNS(null, "ry", Math.abs(y - cy) );
break;
case "fhellipse":
case "fhrect":
freehand_min_x = Math.min(x, freehand_min_x);
freehand_max_x = Math.max(x, freehand_max_x);
freehand_min_y = Math.min(y, freehand_min_y);
freehand_max_y = Math.max(y, freehand_max_y);
// break; missing on purpose
case "path":
d_attr += "L" + x + " " + y + " ";
shape.setAttributeNS(null, "d", d_attr);
break;
}
}
var mouseUp = function()
{
if (!started) return;
started = false;
var element = svgdoc.getElementById(getId());
var keep = false;
switch (current_mode)
{
case "select":
if (element.getAttribute('width') == 0 &&
element.getAttribute('height') == 0) {
// only one element is selected and stored in selected variable (or null)
} else {
// element.getAttribute('x')
// element.getAttribute('y')
// should scan elements which are in rect(x,y,width,height) and select them
}
break;
case "path":
keep = true;
break;
case "line":
keep = (element.getAttribute('x1') != element.getAttribute('x2') ||
element.getAttribute('y1') == element.getAttribute('y2'));
break;
case "square":
case "rect":
keep = (element.getAttribute('width') != 0 ||
element.getAttribute('height') != 0);
break;
case "circle":
keep = (element.getAttribute('r') != 0);
break;
case "ellipse":
keep = (element.getAttribute('rx') != 0 ||
element.getAttribute('ry') != 0);
break;
case "fhellipse":
if ((freehand_max_x - freehand_min_x) > 0 &&
(freehand_max_y - freehand_min_y) > 0) {
call("changed",addSvgElementFromJson({
"element": "ellipse",
"attr": {
"cx": (freehand_min_x + freehand_max_x) / 2,
"cy": (freehand_min_y + freehand_max_y) / 2,
"rx": (freehand_max_x - freehand_min_x) / 2,
"ry": (freehand_max_y - freehand_min_y) / 2,
"id": getId(),
"fill": current_fill,
"stroke": current_stroke,
"stroke-width": current_stroke_width,
"stroke-dasharray": current_stroke_style,
"opacity": current_opacity,
"stroke-opacity": current_stroke_opacity,
"fill-opacity": current_fill_opacity
}
}));
}
break;
case "fhrect":
if ((freehand_max_x - freehand_min_x) > 0 &&
(freehand_max_y - freehand_min_y) > 0) {
call("changed",addSvgElementFromJson({
"element": "rect",
"attr": {
"x": freehand_min_x,
"y": freehand_min_y,
"width": (freehand_max_x - freehand_min_x),
"height": (freehand_max_y - freehand_min_y),
"id": getId(),
"fill": current_fill,
"stroke": current_stroke,
"stroke-width": current_stroke_width,
"stroke-dasharray": current_stroke_style,
"opacity": current_opacity,
"stroke-opacity": current_stroke_opacity,
"fill-opacity": current_fill_opacity
}
}));
}
break;
}
d_attr = null;
obj_num++;
if (!keep) {
element.parentNode.removeChild(element);
element = null;
} else if (element != null) {
element.setAttribute("opacity", current_opacity);
cleanupElement(element);
call("changed",element);
}
}
// public functions
this.save = function() {
var str = "<?xml version=\"1.0\" standalone=\"no\"?>\n"
str += "<!DOCTYPE svg PUBLIC \"-//W3C//DTD SVG 1.1//EN\" \"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd\">\n";
str += svgToString(svgroot, 0);
this.saveHandler(str);
}
this.clear = function() {
var nodes = svgroot.childNodes;
var len = svgroot.childNodes.length;
var i = 0;
for(var rep = 0; rep < len; rep++){
if (nodes[i].nodeType == 1) { // element node
nodes[i].parentNode.removeChild(nodes[i]);
} else {
i++;
}
}
}
this.getMode = function() {
return current_mode;
}
this.setMode = function(name) {
current_mode = name;
}
this.getStrokeColor = function() {
return current_stroke;
}
this.setStrokeColor = function(color) {
current_stroke = color;
}
this.getFillColor = function() {
return current_fill;
}
this.setFillColor = function(color) {
current_fill = color;
}
this.getStrokeWidth = function() {
return current_stroke_width;
}
this.setStrokeWidth = function(val) {
current_stroke_width = val;
}
this.getStrokeStyle = function() {
return current_stroke_style;
}
this.setStrokeStyle = function(val) {
current_stroke_style = val;
}
this.getOpacity = function() {
return current_opacity;
}
this.setOpacity = function(val) {
current_opacity = val;
}
this.getFillOpacity = function() {
return current_fill_opacity;
}
this.setFillOpacity = function(val) {
current_fill_opacity = val;
}
this.getStrokeOpacity = function() {
return current_stroke_opacity;
}
this.setStrokeOpacity = function(val) {
current_stroke_opacity = val;
}
this.bind = function(event, f) {
events[event] = f;
}
$(container).mouseup(mouseUp);
$(container).mousedown(mouseDown);
$(container).mousemove(mouseMove);
this.saveHandler = function(svg) {
alert(svg);
}
}