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shap.js
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shap.js
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function shape(canvas,canvas1,cobj){
this.canvas = canvas;
this.canvas1=canvas1;
this.cobj = cobj;
this.bgcolor = "black";
this.bordercolor = "black";
this.type="stroke";
this.shapes="line";
this.linewidth = 1;
this.width=canvas1.width;
this.height=canvas1.height;
this.history =[];
}
shape.prototype = {
init:function(){
this.cobj.fillStyle = this.bgcolor;
this.cobj.strokeStyle = this.bordercolor;
this.cobj.lineWidth = this.linewidth;
},
line:function(x,y,x1,y1){
var that=this;
that.cobj.beginPath();
that.cobj.moveTo(x,y);
that.cobj.lineTo(x1,y1);
that.cobj.closePath();
that.cobj[that.type]();
},
rect:function(x,y,x1,y1){
var that=this;
that.cobj.beginPath();
that.cobj.rect(x,y,x1-x,y1-y);
that.cobj.closePath();
that.cobj[that.type]();
},
circle:function(x,y,x1,y1){
var that=this;
that.cobj.beginPath();
var r = Math.sqrt((x1-x)*(x1-x)+(y1-y)*(y1-y));
that.cobj.arc(x,y,r,0,Math.PI*2);
that.cobj.closePath();
that.cobj[that.type]();
},
pen:function(){
var that=this;
that.cobj[that.type]();
},
wujiao:function(x,y,x1,y1){
var that=this;
var r =Math.sqrt( (x1-x)*(x1-x)+(y1-y)*(y1-y) );
var r1=r/2;
that.cobj.beginPath();
that.cobj.moveTo(x+r,y);
for( var i=1;i<10;i++){
if (i%2==0){
that.cobj.lineTo(Math.cos(i*36*Math.PI/180)*r+x,Math.sin(i*36*Math.PI/180)*r+y);
}else{
that.cobj.lineTo(Math.cos(i*36*Math.PI/180)*r1+x,Math.sin(i*36*Math.PI/180)*r1+y);
}
}
that.cobj.closePath();
that.cobj[this.type]();
},
draw:function(){
var that = this;
that.canvas.onmousedown = function(e){
var startx = e.offsetX;
var starty = e.offsetY;
if (that.shapes=="pen"){
that.cobj.beginPath();
that.cobj.moveTo(startx,starty);
}
that.canvas.onmousemove = function(e){
that.cobj.clearRect(0,0,that.width,that.height);
if (that.history.length>0){
that.cobj.putImageData(that.history[that.history.length-1],0,0);
}
var endx = e.offsetX;
var endy = e.offsetY;
that.init();
that[that.shapes](startx,starty,endx,endy);
if (that.shapes=="pen"){
that.cobj.lineTo(endx,endy);
}
}
that.canvas.onmouseup = function(){
that.history.push(that.cobj.getImageData(0,0,that.width,that.height));
that.canvas.onmousemove=null;
that.canvas.onmouseup=null;
if(that.shapes=="pen"){
that.cobj.closePath();
}
}
}
},
xp:function(xpobj,w,h){
var that=this;
that.canvas.onmousemove = function (e) {
var ox = e.offsetX;
var oy = e.offsetY;
var lefts = ox - w / 2;
var tops = oy - h / 2;
if (lefts < 0) {
lefts = 0;
}
if (lefts > that.width - w) {
lefts = that.width - w;
}
if (tops < 0) {
tops = 0;
}
if (tops > that.height - h) {
tops = that.height - h;
}
xpobj.css({
display:"block",
left:lefts,
width:w,
height:h,
top:tops
})
}
that.canvas.onmousedown = function() {
that.canvas.onmousemove = function (e) {
var ox = e.offsetX;
var oy = e.offsetY;
var lefts = ox - w / 2;
var tops = oy - h / 2;
if (lefts < 0) {
lefts = 0;
}
if (lefts > that.width - w) {
lefts = that.width - w;
}
if (tops < 0) {
tops = 0;
}
if (tops > that.height - h) {
tops = that.height - h;
}
xpobj.css({
display:"block",
left:lefts,
width:w,
height:h,
top:tops
})
that.cobj.clearRect(lefts,tops,w,h);
}
that.canvas.onmouseup = function(){
that.history.push(that.cobj.getImageData(0,0,that.width,that.height));
that.canvas.onmousemove=null;
that.canvas.onmouseup=null;
xpobj.css({
display:"none"
})
}
}
},
select:function(selectareaobj){
var that = this;
that.init();
that.canvas.onmousedown = function(e){
var startx = e.offsetX;
var starty = e.offsetY;
var minx,miny,w,h;
that.canvas.onmousemove =function(e){
that.init();
var endx = e.offsetX;
var endy = e.offsetY;
minx=startx>endx?endx:startx;
miny=starty>endy?endy:starty;
w=Math.abs(endx-startx);
h=Math.abs(endy-starty);
selectareaobj.css({
display:"block",
left:minx,
top:miny,
width:w,
height:h
})
}
that.canvas.onmouseup = function(){
that.canvas.onmouseup=null;
that.canvas.onmousemove=null;
that.temp=that.cobj.getImageData(minx,miny,w,h);
that.cobj.clearRect(minx,miny, w,h);
that.history.push(that.cobj.getImageData(0,0,that.width,that.height));
that.cobj.putImageData(that.temp,minx,miny);
that.drag(minx,miny,w,h,selectareaobj);
}
}
},
drag:function (x,y,w,h,selectareaobj){
var that=this;
that.canvas.onmousemove=function(e){
var ox= e.offsetX;
var oy= e.offsetY;
if(ox>x&&ox<x+w&&oy>y&&oy<y+h){
that.canvas.style.cursor="move";
}else{
that.canvas.style.cursor="default";
}
}
that.canvas.onmousedown = function(e){
var ox= e.offsetX;
var oy= e.offsetY;
var cx = ox-x;
var cy = oy-y;
if(ox>x&&ox<x+w&&oy>y&&oy<y+h){
that.canvas.style.cursor="move";
}else{
that.canvas.style.cursor="default";
return;
}
that.canvas.onmousemove = function(e){
that.cobj.clearRect(0,0,that.width,that.height);
if(that.history!=0){
that.cobj.putImageData(that.history[that.history.length-1],0,0);
}
var endx= e.offsetX;
var endy= e.offsetY;
var lefts=endx-cx;
var tops=endy-cy;
if (lefts < 0) {
lefts = 0;
}
if (lefts > that.width - w) {
lefts = that.width - w;
}
if (tops < 0) {
tops = 0;
}
if (tops > that.height - h) {
tops = that.height - h;
}
selectareaobj.css({
left:lefts,
top:tops
})
x=lefts;
y=tops;
that.cobj.putImageData(that.temp,lefts,tops);
}
that.canvas.onmouseup = function(){
that.canvas.onmouseup=null;
that.canvas.onmousemove=null;
that.drag(x,y,w,h,selectareaobj);
}
}
}
}