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tessell.js
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tessell.js
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var canvas = document.getElementById("canvas");
var ctx = canvas.getContext("2d");
var SHOW_GRID = false;
var GRID_THICKNESS = 0.5;
var CELL_THICKNESS = 1;
var mainIsSet = false;
var mainTessal;
var Grid = {
offsetX: Math.floor(window.innerWidth / 2),
offsetY: Math.floor(window.innerHeight / 2),
gridSize: 25,
init: function(){
this.offsetX = Math.floor(window.innerWidth / 2);
this.offsetY = Math.floor(window.innerHeight / 2);
},
draw: function() {
ctx.beginPath();
for(var x = this.offsetX % this.gridSize; x < canvas.width; x+= this.gridSize){
ctx.moveTo(x,0);
ctx.lineTo(x,canvas.height);
}
for(var y = this.offsetY % this.gridSize; y < canvas.height; y+= this.gridSize){
ctx.moveTo(0,y);
ctx.lineTo(canvas.width,y);
}
ctx.lineWidth = GRID_THICKNESS;
ctx.stroke();
},
zoom: function(direction) {
// pixel center - the grid pixel offset / gridSize
var oldCenterGridX = ((canvas.width/2) - this.offsetX) / this.gridSize;
var oldCenterGridY = ((canvas.height/2) - this.offsetY) / this.gridSize;
if(direction == "in"){
if(this.gridSize < 200){
this.gridSize += this.gridSize * 0.1;
}
} else if (this.gridSize > 1){ // add or subtract a percentage of the current
this.gridSize -= this.gridSize * 0.1;
}
var newCenterX = oldCenterGridX * this.gridSize + this.offsetX;
var newCenterY = oldCenterGridY * this.gridSize + this.offsetY;
var zoomOffsetX = newCenterX - canvas.width/2;
var zoomOffsetY = newCenterY - canvas.height/2;
this.offsetX -= zoomOffsetX;
this.offsetY -= zoomOffsetY;
}
}
function Cell (thisX,thisY){
this.x = thisX;
this.y = thisY;
this.pxLeft = Grid.offsetX + Grid.gridSize * this.x;
this.pxTop = Grid.offsetY + Grid.gridSize * this.y;
this.pxRight = this.pxLeft + Grid.gridSize;
this.pxBottom = this.pxTop + Grid.gridSize;
this.draw = function(){
ctx.fillRect(Grid.offsetX + Grid.gridSize * this.x,
Grid.offsetY + Grid.gridSize * this.y, Grid.gridSize, Grid.gridSize);
};
this.drawTop = function(offsetX,offsetY){
ctx.beginPath();
ctx.moveTo(this.pxLeft+offsetX,this.pxTop+offsetY);
ctx.lineTo(this.pxRight+offsetX,this.pxTop+offsetY);
ctx.lineWidth = CELL_THICKNESS;
ctx.stroke();
};
this.drawLeft = function(offsetX,offsetY){
ctx.beginPath();
ctx.moveTo(this.pxLeft+offsetX,this.pxTop+offsetY);
ctx.lineTo(this.pxLeft+offsetX,this.pxBottom+offsetY);
ctx.lineWidth = CELL_THICKNESS;
ctx.stroke();
};
this.drawBottom = function(offsetX,offsetY){
ctx.beginPath();
ctx.moveTo(this.pxLeft+offsetX,this.pxBottom+offsetY);
ctx.lineTo(this.pxRight+offsetX,this.pxBottom+offsetY);
ctx.lineWidth = CELL_THICKNESS;
ctx.stroke();
};
this.drawRight = function(offsetX,offsetY){
ctx.beginPath();
ctx.moveTo(this.pxRight+offsetX,this.pxTop+offsetY);
ctx.lineTo(this.pxRight+offsetX,this.pxBottom+offsetY);
ctx.lineWidth = CELL_THICKNESS;
ctx.stroke();
};
}
function Tessellation(width,height,vertShift,horzShift){
this.cells = [];
this.x;
this.y;
this.width = width;
this.height = height;
this.vertShift = vertShift;
this.horzShift = horzShift;
this.init = function(){
this.x = Math.floor(-this.width/2);
this.y = Math.floor(-this.height/2);
for(var xi = this.x; xi < this.x+this.width; xi++){
for(var yi = this.y; yi < this.y+this.height; yi++){
this.addCell(new Cell(xi,yi));
}
}
};
this.draw = function(){
for(var i = 0; i < this.cells.length; i++){
ctx.fillStyle = "#7ca6ea";
this.cells[i].draw();
}
}
this.drawOutline= function(offsetX,offsetY){
var pxOffsetX = offsetX*Grid.gridSize || 0;
var pxOffsetY = offsetY*Grid.gridSize || 0;
for(var i = 0; i < this.cells.length; i++){
if(this.getindex(new Cell(this.cells[i].x,this.cells[i].y-1)) == -1){
this.cells[i].drawTop(pxOffsetX,pxOffsetY);
}
if(this.getindex(new Cell(this.cells[i].x-1,this.cells[i].y)) == -1){
this.cells[i].drawLeft(pxOffsetX,pxOffsetY);
}
if(this.getindex(new Cell(this.cells[i].x,this.cells[i].y+1)) == -1){
this.cells[i].drawBottom(pxOffsetX,pxOffsetY);
}
if(this.getindex(new Cell(this.cells[i].x+1,this.cells[i].y)) == -1){
this.cells[i].drawRight(pxOffsetX,pxOffsetY);
}
}
};
this.fillBoard = function(){
// the number of cells from the middle of the screen to the edge of the grid
var offsetX = Math.ceil(Grid.offsetX/Grid.gridSize);
var offsetY = Math.ceil(Grid.offsetY/Grid.gridSize);
// the number of cells from the edge of the main tessel to the start of the repeating background
var x = -this.width*(Math.ceil(offsetX/this.width));
var y = -this.height*(Math.ceil(offsetY/this.height));
// the number of tessalations displaying across the screen
var numCols = ((x*-1)/this.width) *2 +1;
var numRows = ((y*-1)/this.height) *2 +1;
// did some math to adjust the x to the shifts
var totalHorzShift = -(((y*-1)/this.height)*this.horzShift)%this.width;
for(var r = 0; r < numRows; r++){
var totalVertShift = -(((x*-1)/this.width+1)*this.vertShift)%this.height;
for(var c = 0; c < numCols; c++){
totalVertShift = (totalVertShift + this.vertShift)%this.height;
this.drawOutline(x+(c*this.width)+totalHorzShift,y+(r*this.height)+totalVertShift);
}
totalHorzShift = (totalHorzShift + this.horzShift)%this.width;
}
}
this.getindex = function(cellWeAreTesting){
for(var i = 0; i < this.cells.length; i++){
if(cellWeAreTesting.x == this.cells[i].x &&
cellWeAreTesting.y == this.cells[i].y){
return i;
}
}
return -1;
};
this.getAbstractIndex = function(cell){
var thisMainEquiv = this.getMainEquiv(cell);
for(var i = 0; i < this.cells.length; i++){
var centralEquiv = this.getMainEquiv(this.cells[i]);
if(thisMainEquiv.x == centralEquiv.x &&
thisMainEquiv.y == centralEquiv.y){
return i;
}
}
};
this.addCell = function(cellToAdd){
if(this.getindex(cellToAdd) == -1){
this.cells.push(cellToAdd);
}
}
this.removeCell = function(cellToRemove){
var index = this.getindex(cellToRemove);
if(index == -1){return}
this.cells.splice(index,1);
}
this.isInMain = function(cell){
var column = Math.floor(((cell.x-this.x) - (Math.floor((cell.y-this.y)/this.height)*this.horzShift))/this.width);
var row = Math.floor(((cell.y-this.y) - (Math.floor((cell.x-this.x)/this.width)*this.vertShift))/this.height);
if(column == 0 && row == 0){
return true;
} else {
return false;
}
}
this.getMainEquiv = function(cell){
var column = Math.floor(((cell.x-this.x) - (Math.floor((cell.y-this.y)/this.height)*this.horzShift))/this.width);
var row = Math.floor(((cell.y-this.y) - (Math.floor((cell.x-this.x)/this.width)*this.vertShift))/this.height);
var x = cell.x - (column*this.width+row*this.horzShift);
var y = cell.y - (row*this.height+column*this.vertShift);
return new Cell(x,y);
}
this.toggle = function(cellToToggle){
var index = this.getindex(cellToToggle);
// clicked on a blue cell
if(index != -1){
// remove the blue cell
this.cells.splice(index,1);
// check the 4 cells around it to see where to put it
// if more than one neibor is a valid spot or if it is not
// on the edge then ask where to put it
this.addCell(this.getMainEquiv(cellToToggle));
// clicked on a grey cell
} else {
// remove the associated blue cell
this.cells.splice(this.getAbstractIndex(cellToToggle),1);
// turn the grey cell blue
this.addCell(cellToToggle);
}
};
}
{
var mouseIsDown = false;
var mouseDownX = 0;
var mouseDownY = 0;
var topCorner,width,height;
window.onmousedown = function(Event){
mouseIsDown = true;
mouseDownX = Event.pageX;
mouseDownY = Event.pageY;
var cell = new Cell(Math.floor((mouseDownX - Grid.offsetX)/Grid.gridSize),
Math.floor((mouseDownY - Grid.offsetY)/Grid.gridSize));
if(mainIsSet){
mainTessal.toggle(cell);
} else {
topCorner = cell;
}
draw();
};
window.onmousemove = function(Event){
var cell = new Cell(Math.floor((Event.pageX - Grid.offsetX)/Grid.gridSize),
Math.floor((Event.pageY - Grid.offsetY)/Grid.gridSize));
if(mouseIsDown && !mainIsSet){
width = cell.pxLeft - topCorner.pxLeft;
height = cell.pxTop - topCorner.pxTop;
draw();
ctx.fillRect(Grid.offsetX + Grid.gridSize * topCorner.x,
Grid.offsetY + Grid.gridSize * topCorner.y,width,height);
}
};
window.onmouseup = function(){
mouseIsDown = false;
if(!mainIsSet && (width*height) >= 3){
mainIsSet = true;
mainTessal = new Tessellation(width/Grid.gridSize,height/Grid.gridSize,0,29);
mainTessal.init();
draw();
}
};
} // Mouse Handlers
{
window.addEventListener("keydown", function (event) {
if (event.defaultPrevented) {
return; // Should do nothing if the key event was already consumed.
}
// 187 +
// 189 -
//alert(event.keyCode);
switch(event.keyCode) {
case 187:
Grid.zoom("in");
break;
case 189:
Grid.zoom("out");
break;
case 32: // space
break;
default:
return;
}
// Consume the event to avoid it being handled twice
event.preventDefault();
}, true);
} // Keyboard Handler
function draw() {
// clear screen
ctx.clearRect(0,0,canvas.width,canvas.height);
if(SHOW_GRID){Grid.draw();}
if(mainIsSet){
mainTessal.draw();
mainTessal.fillBoard();
} else {
ctx.font = "20px Arial";
ctx.fillText("Click and Drag to make the tessalation the size you want",100,100);
}
}
function init() {
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
Grid.init();
mainTessal = new Tessellation(9,3,0,2);
draw();
}
window.onresize = function(){
canvas.width = window.innerWidth;
canvas.height = window.innerHeight;
Grid.init();
draw();
}
init();