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d8a2fa4403
pointvec/desktop/sources/scripts/dotgrid.js
Devine Lu Linvega d8a2fa4403 Improved keyboard controls
2018-02-20 09:20:05 +13:00

585 lines
23 KiB
JavaScript
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function Dotgrid(width,height,grid_x,grid_y,block_x,block_y,thickness = 3,linecap = "round",linejoin = "round", color = "#000000")
{
this.controller = new Controller();
this.theme = new Theme();
this.interface = new Interface();
this.history = new History();
this.guide = new Guide();
this.render = new Render();
this.tool = new Tool();
this.keyboard = new Keyboard();
this.width = width;
this.height = height;
this.grid_x = grid_x;
this.grid_y = grid_y;
this.block_x = block_x;
this.block_y = block_y;
this.thickness = thickness;
this.linecap = linecap;
this.linejoin = linejoin;
this.color = color;
this.offset = new Pos(0,0);
// Dotgrid
this.element = document.createElement("div");
this.element.id = "dotgrid";
this.element.style.width = this.width;
this.element.style.height = this.height;
this.wrapper = document.createElement("div");
this.wrapper.id = "wrapper";
this.grid_width = this.width/this.grid_x;
this.grid_height = this.height/this.grid_y;
var cursor = null;
this.svg_el = null;
this.mirror_el = null;
this.mirror = false;
this.fill = false;
this.layer_1 = document.createElementNS("http://www.w3.org/2000/svg", "path"); this.layer_1.id = "layer_1"; this.layer_1.style.stroke = "black";
this.layer_2 = document.createElementNS("http://www.w3.org/2000/svg", "path"); this.layer_2.id = "layer_2"; this.layer_2.style.stroke = "#999";
this.layer_3 = document.createElementNS("http://www.w3.org/2000/svg", "path"); this.layer_3.id = "layer_3"; this.layer_3.style.stroke = "#ccc";
this.mirror_layer_1 = document.createElementNS("http://www.w3.org/2000/svg", "path"); this.mirror_layer_1.id = "mirror_layer_1"; this.mirror_layer_1.style.stroke = "black";
this.mirror_layer_2 = document.createElementNS("http://www.w3.org/2000/svg", "path"); this.mirror_layer_2.id = "mirror_layer_2"; this.mirror_layer_2.style.stroke = "#999";
this.mirror_layer_3 = document.createElementNS("http://www.w3.org/2000/svg", "path"); this.mirror_layer_3.id = "mirror_layer_3"; this.mirror_layer_3.style.stroke = "#ccc";
this.scale = 1;
this.install = function()
{
document.getElementById("app").appendChild(this.wrapper);
this.wrapper.appendChild(this.element);
this.element.appendChild(this.guide.el);
this.element.appendChild(this.guide.widgets);
this.wrapper.appendChild(this.render.el);
// Cursors
this.cursor = document.createElement("div");
this.cursor.id = "cursor";
this.element.appendChild(this.cursor);
this.cursor_x = document.createElement("t");
this.cursor_x.id = "cursor_x";
this.cursor_x.className = "fl"
this.element.appendChild(this.cursor_x);
this.cursor_y = document.createElement("t");
this.cursor_y.id = "cursor_y";
this.cursor_y.className = "fl"
this.element.appendChild(this.cursor_y);
this.offset_el = document.createElementNS("http://www.w3.org/2000/svg", "g");
this.mirror_el = document.createElementNS("http://www.w3.org/2000/svg", "g");
// Vector
this.svg_el = document.createElementNS("http://www.w3.org/2000/svg", "svg");
this.svg_el.setAttribute("class","vector");
this.svg_el.setAttribute("width",this.width+"px");
this.svg_el.setAttribute("height",this.height+"px");
this.svg_el.setAttribute("xmlns","http://www.w3.org/2000/svg");
this.svg_el.setAttribute("baseProfile","full");
this.svg_el.setAttribute("version","1.1");
this.svg_el.style.width = this.width;
this.svg_el.style.height = this.height;
this.svg_el.style.stroke = this.color;
this.svg_el.style.strokeWidth = this.thickness;
this.svg_el.style.fill = "none";
this.svg_el.style.strokeLinecap = this.linecap;
this.svg_el.style.strokeLinejoin = this.linejoin;
this.element.appendChild(this.svg_el);
// Preview
this.preview_el = document.createElementNS("http://www.w3.org/2000/svg", "svg");
this.preview_el.id = "preview"
this.preview_el.setAttribute("class","vector");
this.preview_el.setAttribute("width",this.width+"px");
this.preview_el.setAttribute("height",this.height+"px");
this.preview_el.setAttribute("xmlns","http://www.w3.org/2000/svg");
this.preview_el.setAttribute("baseProfile","full");
this.preview_el.setAttribute("version","1.1");
this.preview_el.style.width = this.width;
this.preview_el.style.height = this.height;
this.preview_el.style.strokeWidth = 2;
this.preview_el.style.fill = "none";
this.preview_el.style.strokeLinecap = "round";
this.element.appendChild(this.preview_el);
this.mirror_el.appendChild(this.mirror_layer_3)
this.offset_el.appendChild(this.layer_3)
this.mirror_el.appendChild(this.mirror_layer_2)
this.offset_el.appendChild(this.layer_2)
this.mirror_el.appendChild(this.mirror_layer_1)
this.offset_el.appendChild(this.layer_1)
this.svg_el.appendChild(this.offset_el);
this.svg_el.appendChild(this.mirror_el);
this.theme.start();
this.guide.start();
this.interface.start();
this.controller.add("default","*","About",() => { require('electron').shell.openExternal('https://github.com/hundredrabbits/Dotgrid'); },"CmdOrCtrl+,");
this.controller.add("default","*","Fullscreen",() => { app.toggle_fullscreen(); },"CmdOrCtrl+Enter");
this.controller.add("default","*","Hide",() => { app.toggle_visible(); },"CmdOrCtrl+H");
this.controller.add("default","*","Inspect",() => { app.inspect(); },"CmdOrCtrl+.");
this.controller.add("default","*","Documentation",() => { dotgrid.controller.docs(); },"CmdOrCtrl+Esc");
this.controller.add("default","*","Reset",() => { dotgrid.reset(); dotgrid.theme.reset(); },"CmdOrCtrl+Backspace");
this.controller.add("default","*","Quit",() => { app.exit(); },"CmdOrCtrl+Q");
this.controller.add("default","File","New",() => { dotgrid.new(); },"CmdOrCtrl+N");
this.controller.add("default","File","Open",() => { dotgrid.open(); },"CmdOrCtrl+O");
this.controller.add("default","File","Save",() => { dotgrid.save(); },"CmdOrCtrl+S");
this.controller.add("default","Edit","Copy",() => { document.execCommand('copy'); },"CmdOrCtrl+C");
this.controller.add("default","Edit","Cut",() => { document.execCommand('cut'); },"CmdOrCtrl+X");
this.controller.add("default","Edit","Paste",() => { document.execCommand('paste'); },"CmdOrCtrl+V");
this.controller.add("default","Edit","Undo",() => { dotgrid.tool.undo(); },"CmdOrCtrl+Z");
this.controller.add("default","Edit","Redo",() => { dotgrid.tool.redo(); },"CmdOrCtrl+Shift+Z");
this.controller.add("default","Edit","Delete",() => { dotgrid.tool.remove_segment(); },"Backspace");
this.controller.add("default","Edit","Deselect",() => { dotgrid.tool.clear(); },"Esc");
this.controller.add("default","Stroke","Line",() => { dotgrid.tool.cast("line"); },"A");
this.controller.add("default","Stroke","Arc",() => { dotgrid.tool.cast("arc_c"); },"S"); // 0,1
this.controller.add("default","Stroke","Arc Rev",() => { dotgrid.tool.cast("arc_r")},"D"); // 0,0
this.controller.add("default","Stroke","Bezier",() => { dotgrid.tool.cast("bezier") },"F");
this.controller.add("default","Stroke","Connect",() => { dotgrid.tool.cast("close") },"Z");
this.controller.add("default","Effect","Linecap",() => { dotgrid.mod_linecap(); },"Q");
this.controller.add("default","Effect","Linejoin",() => { dotgrid.mod_linejoin(); },"W");
this.controller.add("default","Effect","Mirror",() => { dotgrid.mod_mirror(); },"E");
this.controller.add("default","Effect","Fill",() => { dotgrid.toggle_fill(); },"R");
this.controller.add("default","Effect","Thicker",() => { dotgrid.mod_thickness(1) },"}");
this.controller.add("default","Effect","Thinner",() => { dotgrid.mod_thickness(-1) },"{");
this.controller.add("default","Effect","Thicker +5",() => { dotgrid.mod_thickness(5,true) },"]");
this.controller.add("default","Effect","Thinner -5",() => { dotgrid.mod_thickness(-5,true) },"[");
this.controller.add("default","Layers","Move Above",() => { dotgrid.tool.layer_up() },"P");
this.controller.add("default","Layers","Move Below",() => { dotgrid.tool.layer_down() },"L");
this.controller.add("default","View","Tools",() => { dotgrid.interface.toggle(); },"U");
this.controller.add("default","View","Grid",() => { dotgrid.guide.toggle(); },"H");
this.controller.add("default","View","Control Points",() => { dotgrid.guide.toggle_widgets(); },"J");
this.controller.add("default","Mode","Toggle Size",() => { dotgrid.interface.toggle_zoom(); },"CmdOrCtrl+E");
this.controller.add("default","Mode","Keyboard",() => { dotgrid.keyboard.start(); },"CmdOrCtrl+K");
this.controller.add("keyboard","*","About",() => { require('electron').shell.openExternal('https://github.com/hundredrabbits/Dotgrid'); },"CmdOrCtrl+,");
this.controller.add("keyboard","*","Fullscreen",() => { app.toggle_fullscreen(); },"CmdOrCtrl+Enter");
this.controller.add("keyboard","*","Hide",() => { app.toggle_visible(); },"CmdOrCtrl+H");
this.controller.add("keyboard","*","Inspect",() => { app.inspect(); },"CmdOrCtrl+.");
this.controller.add("keyboard","*","Documentation",() => { dotgrid.controller.docs(); },"CmdOrCtrl+Esc");
this.controller.add("keyboard","*","Reset",() => { dotgrid.reset(); dotgrid.theme.reset(); },"CmdOrCtrl+Backspace");
this.controller.add("keyboard","*","Quit",() => { app.exit(); },"CmdOrCtrl+Q");
this.controller.add("keyboard","Controls","Add vertex",() => { dotgrid.keyboard.confirm(); },"Enter");
this.controller.add("keyboard","Controls","Remove vertex",() => { dotgrid.keyboard.erase(); },"Backspace");
this.controller.add("keyboard","Select","Move Up",() => { dotgrid.keyboard.move(0,1); },"Up");
this.controller.add("keyboard","Select","Move Down",() => { dotgrid.keyboard.move(0,-1); },"Down");
this.controller.add("keyboard","Select","Move Left",() => { dotgrid.keyboard.move(1,0); },"Left");
this.controller.add("keyboard","Select","Move Right",() => { dotgrid.keyboard.move(-1,0); },"Right");
this.controller.add("keyboard","Select","XXYY(0)",() => { dotgrid.keyboard.push(0); },"0");
this.controller.add("keyboard","Select","XXYY(1)",() => { dotgrid.keyboard.push(1); },"1");
this.controller.add("keyboard","Select","XXYY(2)",() => { dotgrid.keyboard.push(2); },"2");
this.controller.add("keyboard","Select","XXYY(3)",() => { dotgrid.keyboard.push(3); },"3");
this.controller.add("keyboard","Select","XXYY(4)",() => { dotgrid.keyboard.push(4); },"4");
this.controller.add("keyboard","Select","XXYY(5)",() => { dotgrid.keyboard.push(5); },"5");
this.controller.add("keyboard","Select","XXYY(6)",() => { dotgrid.keyboard.push(6); },"6");
this.controller.add("keyboard","Select","XXYY(7)",() => { dotgrid.keyboard.push(7); },"7");
this.controller.add("keyboard","Select","XXYY(8)",() => { dotgrid.keyboard.push(8); },"8");
this.controller.add("keyboard","Select","XXYY(9)",() => { dotgrid.keyboard.push(9); },"9");
this.controller.add("keyboard","Mode","Stop Keyboard Mode",() => { dotgrid.keyboard.stop(); },"Escape");
this.controller.commit();
document.addEventListener('mousedown', function(e){ dotgrid.mouse_down(e); }, false);
document.addEventListener('mousemove', function(e){ dotgrid.mouse_move(e); }, false);
document.addEventListener('contextmenu', function(e){ dotgrid.mouse_alt(e); }, false);
document.addEventListener('mouseup', function(e){ dotgrid.mouse_up(e);}, false);
document.addEventListener('copy', function(e){ dotgrid.copy(e); e.preventDefault(); }, false);
document.addEventListener('cut', function(e){ dotgrid.cut(e); e.preventDefault(); }, false);
document.addEventListener('paste', function(e){ dotgrid.paste(e); e.preventDefault(); }, false);
window.addEventListener('drop', dotgrid.drag);
dotgrid.set_size({width:300,height:300});
this.new();
}
// FILE
this.new = function()
{
this.history.push(this.tool.layers);
dotgrid.clear();
}
this.save = function()
{
this.scale = 1
this.draw();
if(dotgrid.fill){ dotgrid.svg_el.style.fill = "black"; dotgrid.render.draw(); }
var svg = dotgrid.svg_el.outerHTML;
dialog.showSaveDialog((fileName) => {
if (fileName === undefined){ return; }
fs.writeFile(fileName+".svg", svg);
fs.writeFile(fileName+'.png', dotgrid.render.buffer());
fs.writeFile(fileName+'.dot', dotgrid.tool.export());
dotgrid.draw()
});
}
this.open = function()
{
var paths = dialog.showOpenDialog({properties: ['openFile'],filters:[{name:"Dotgrid Image",extensions:["dot"]}]});
if(!paths){ console.log("Nothing to load"); return; }
fs.readFile(paths[0], 'utf-8', (err, data) => {
if(err){ alert("An error ocurred reading the file :" + err.message); return; }
dotgrid.tool.replace(JSON.parse(data.toString().trim()));
dotgrid.draw();
});
}
// Cursor
this.translation = null;
this.mouse_down = function(e)
{
var pos = this.position_in_grid(new Pos(e.clientX+5,e.clientY-5)); pos = this.position_on_grid(pos);
if(e.altKey){ dotgrid.tool.remove_segments_at(pos); return; }
if(dotgrid.tool.vertex_at(pos)){ console.log("Begin translation"); dotgrid.translation = {from:pos,to:pos}; return; }
var o = e.target.getAttribute("ar");
if(!o){ return; }
if(o == "line"){ this.tool.cast("line"); }
if(o == "arc_c"){ this.tool.cast("arc_c"); }
if(o == "arc_r"){ this.tool.cast("arc_r"); }
if(o == "bezier"){ this.tool.cast("bezier"); }
if(o == "close"){ this.tool.cast("close"); }
if(o == "thickness"){ this.mod_thickness(); }
if(o == "linecap"){ this.mod_linecap(); }
if(o == "linejoin"){ this.mod_linejoin(); }
if(o == "mirror"){ this.mod_mirror(); }
if(o == "fill"){ this.toggle_fill(); }
if(o == "export"){ this.save(); }
}
this.mouse_move = function(e)
{
var pos = this.position_in_grid(new Pos(e.clientX+5,e.clientY-5)); pos = this.position_on_grid(pos);
if(dotgrid.translation && (Math.abs(dotgrid.translation.from.x) != Math.abs(pos.x) || Math.abs(dotgrid.translation.from.y) != Math.abs(pos.y))){ dotgrid.translation.to = pos; }
dotgrid.preview(e.target.getAttribute("ar"));
dotgrid.move_cursor(pos)
dotgrid.guide.update();
}
this.mouse_up = function(e)
{
var pos = this.position_in_grid(new Pos(e.clientX+5,e.clientY-5)); pos = this.position_on_grid(pos);
if(e.altKey){ return; }
if(pos.x > 0) { dotgrid.translation = null; return; }
if(dotgrid.translation && (Math.abs(dotgrid.translation.from.x) != Math.abs(dotgrid.translation.to.x) || Math.abs(dotgrid.translation.from.y) != Math.abs(dotgrid.translation.to.y))){
dotgrid.tool.translate(dotgrid.translation.from,dotgrid.translation.to);
dotgrid.translation = null;
this.draw();
return;
}
this.tool.add_vertex({x:pos.x * -1,y:pos.y});
dotgrid.translation = null;
this.draw();
}
this.mouse_alt = function(e)
{
var pos = this.position_in_grid(new Pos(e.clientX+5,e.clientY-5)); pos = this.position_on_grid(pos);
dotgrid.tool.remove_segments_at(pos);
e.preventDefault();
setTimeout(() => { dotgrid.tool.clear(); },150);
}
this.move_cursor = function(pos)
{
if(pos.x>0) {
this.cursor.style.visibility = "hidden"
} else {
if(this.cursor.style.visibility == "hidden") {
this.cursor.style.transition = "initial"
}
this.cursor.style.visibility = "visible"
this.cursor.style.left = Math.floor(-(pos.x-this.grid_width));
this.cursor.style.top = Math.floor(pos.y+this.grid_height);
this.update_cursor(pos);
window.setTimeout(() => dotgrid.cursor.style.transition = "all 50ms", 17 /*one frame*/)
}
}
this.update_cursor = function(pos)
{
this.cursor_x.style.left = `${-pos.x}px`;
this.cursor_x.textContent = parseInt(-pos.x/this.grid_width)
this.cursor_y.style.top = `${pos.y}px`;
this.cursor_y.textContent = parseInt(pos.y/this.grid_width)
}
this.preview = function(operation)
{
if(!operation){ return `<path d='M0,0'></path>`;}
if(operation != "line" && operation != "arc_c" && operation != "arc_r" && operation != "bezier" && operation != "close"){ return `<path d='M0,0'></path>`; }
this.preview_el.innerHTML = `<path d='${dotgrid.tool.path([{type:operation,verteces:dotgrid.tool.verteces}])}'></path>`;
}
// Toggles
this.mod_thickness = function(mod,step = false)
{
if(!mod){ mod = 1; this.thickness = this.thickness > 30 ? 1 : this.thickness }
if(step){
this.thickness = parseInt(this.thickness/5) * 5;
}
this.thickness = Math.max(this.thickness+mod,0);
this.cursor_x.textContent = this.thickness;
this.draw();
}
this.mod_linecap_index = 1;
this.mod_linecap = function(mod)
{
var a = ["butt","square","round"];
this.mod_linecap_index += 1;
this.linecap = a[this.mod_linecap_index % a.length];
this.draw();
}
this.mod_linejoin_index = 1;
this.mod_linejoin = function(mod)
{
var a = ["miter","round","bevel"];
this.mod_linejoin_index += 1;
this.linejoin = a[this.mod_linejoin_index % a.length];
this.draw();
}
this.mirror_index = 0;
this.mod_mirror = function()
{
this.mirror_index += 1;
this.mirror_index = this.mirror_index > 3 ? 0 : this.mirror_index;
this.draw();
}
this.toggle_fill = function()
{
dotgrid.fill = dotgrid.fill ? false : true;
this.draw();
}
this.set_size = function(size = {width:300,height:300},interface = true)
{
var win = require('electron').remote.getCurrentWindow();
win.setSize(size.width+100,size.height+100+(interface ? 10 : 0),true);
this.width = size.width
this.height = size.height
this.element.style.width = size.width+10
this.element.style.height = size.height+10
this.grid_x = size.width/15
this.grid_y = size.height/15
this.svg_el.setAttribute("width",size.width+"px");
this.svg_el.setAttribute("height",size.height+"px");
this.preview_el.style.width = size.width+10
this.preview_el.style.height = size.height+10
this.preview_el.setAttribute("width",size.width+"px");
this.preview_el.setAttribute("height",size.height+"px");
dotgrid.guide.resize(size);
this.interface.update();
this.draw();
}
this.draw = function(exp = false)
{
var paths = this.tool.paths();
var d = this.tool.path();
this.layer_1.setAttribute("d",paths[0]);
this.layer_2.setAttribute("d",paths[1]);
this.layer_3.setAttribute("d",paths[2]);
this.mirror_layer_1.setAttribute("d",this.mirror_index > 0 ? paths[0] : "M0,0");
this.mirror_layer_2.setAttribute("d",this.mirror_index > 0 ? paths[1] : "M0,0");
this.mirror_layer_3.setAttribute("d",this.mirror_index > 0 ? paths[2] : "M0,0");
this.svg_el.style.width = this.width;
this.svg_el.style.height = this.height;
this.svg_el.style.stroke = this.color;
this.svg_el.style.strokeLinecap = this.linecap;
this.svg_el.style.strokeLinejoin = this.linejoin;
this.svg_el.style.strokeWidth = this.thickness*this.scale;
this.svg_el.style.fill = this.fill ? this.theme.active.f_high : "none";
// Draw Mirror
if(this.mirror_index == 1){
this.mirror_layer_1.setAttribute("transform","translate("+(this.width - (this.offset.x*this.scale))+","+(this.offset.y*this.scale)+"),scale(-1,1)")
this.mirror_layer_2.setAttribute("transform","translate("+(this.width - (this.offset.x*this.scale))+","+(this.offset.y*this.scale)+"),scale(-1,1)")
this.mirror_layer_3.setAttribute("transform","translate("+(this.width - (this.offset.x*this.scale))+","+(this.offset.y*this.scale)+"),scale(-1,1)")
}
else if(this.mirror_index == 2){
this.mirror_layer_1.setAttribute("transform","translate("+((this.offset.x*this.scale))+","+(this.height - (this.offset.y*this.scale))+"),scale(1,-1)")
this.mirror_layer_2.setAttribute("transform","translate("+((this.offset.x*this.scale))+","+(this.height - (this.offset.y*this.scale))+"),scale(1,-1)")
this.mirror_layer_3.setAttribute("transform","translate("+((this.offset.x*this.scale))+","+(this.height - (this.offset.y*this.scale))+"),scale(1,-1)")
}
else if(this.mirror_index == 3){
this.mirror_layer_1.setAttribute("transform","translate("+(this.width -(this.offset.x*this.scale))+","+(this.height - (this.offset.y*this.scale))+"),scale(-1,-1)")
this.mirror_layer_2.setAttribute("transform","translate("+(this.width -(this.offset.x*this.scale))+","+(this.height - (this.offset.y*this.scale))+"),scale(-1,-1)")
this.mirror_layer_3.setAttribute("transform","translate("+(this.width -(this.offset.x*this.scale))+","+(this.height - (this.offset.y*this.scale))+"),scale(-1,-1)")
}
else{
this.mirror_layer_1.setAttribute("transform","")
this.mirror_layer_2.setAttribute("transform","")
this.mirror_layer_3.setAttribute("transform","")
}
this.offset_el.setAttribute("transform","translate("+(this.offset.x*this.scale)+","+(this.offset.y*this.scale)+")")
this.preview();
this.render.draw();
this.interface.update();
this.guide.update();
}
// Draw
this.reset = function()
{
this.tool.clear();
}
this.clear = function()
{
this.history.clear();
this.tool.reset();
this.reset();
this.thickness = 10
this.linecap = "round"
this.linejoin = "round"
this.color = "#000000"
this.draw();
}
this.drag = function(e)
{
e.preventDefault();
e.stopPropagation();
var file = e.dataTransfer.files[0];
if(!file.path || file.path.indexOf(".dot") < 0){ console.log("Dotgrid","Not a dot file"); return; }
var reader = new FileReader();
reader.onload = function(e){
dotgrid.tool.replace(JSON.parse(e.target.result.toString().trim()));
dotgrid.draw();
};
reader.readAsText(file);
}
this.copy = function(e)
{
dotgrid.scale = 1
dotgrid.width = 300
dotgrid.height = 300
dotgrid.draw();
var svg = dotgrid.svg_el.outerHTML;
e.clipboardData.setData('text/plain', dotgrid.tool.export(dotgrid.tool.layer()));
e.clipboardData.setData('text/html', svg);
e.clipboardData.setData('text/svg+xml', svg);
this.draw();
}
this.cut = function(e)
{
dotgrid.scale = 1
dotgrid.width = 300
dotgrid.height = 300
dotgrid.draw();
var svg = dotgrid.svg_el.outerHTML;
e.clipboardData.setData('text/plain', dotgrid.tool.export(dotgrid.tool.layer()));
e.clipboardData.setData('text/html', svg);
e.clipboardData.setData('text/svg+xml', svg);
dotgrid.tool.layers[dotgrid.tool.index] = [];
this.draw();
}
this.paste = function(e)
{
var data = e.clipboardData.getData("text/plain");
data = JSON.parse(data.trim());
dotgrid.tool.import(data);
this.draw();
}
// Normalizers
this.position_in_grid = function(pos)
{
return new Pos((window.innerWidth/2) - (this.width/2) - pos.x,pos.y - (30+10*(this.scale)))
}
this.position_on_grid = function(pos)
{
pos.y = pos.y - 7.5
pos.x = pos.x + 7.5
x = Math.round(pos.x/this.grid_width)*this.grid_width
y = Math.round(pos.y/this.grid_height)*this.grid_height
off = (x<-this.width || x>0 || y>this.height || y<0)
if(off) {
x = 50
y = -50
}
return new Pos(x,y);
}
}
window.addEventListener('resize', function(e)
{
dotgrid.draw()
}, false);
window.addEventListener('dragover',function(e)
{
e.stopPropagation();
e.preventDefault();
e.dataTransfer.dropEffect = 'copy';
});
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