HTML5 canvas畫圖並儲存成圖片的jcanvas外掛_html5教學技巧

使用了jcanvas插件。

複製程式碼

程式碼如下：

;
;


var maxX=-1;
var maxY=-1;
var minX =99999;
var minY=99999;
function checkData(event){
var x=event.pageX-$('canvas').offset().left;
var y=event .pageY-$('canvas').offset().top;
if(x>maxX){
maxX=x;
}else if(xminX= x;
}
if(y>maxY){
maxY=y;
}否則if(yminY=y;
}
}
$(function(){
var obj=$('canvas');
var temp_e;
var temp_draw=false;

obj.on({
mousedown:function(e){
temp_e=e;
temp_draw=true;
checkData(e);
},
mousemove:function(e ){
},
mousemove:function(e ){
if(temp_draw. ){
obj.drawLine({
行程樣式: '#000',
行程寬度: 3,
x1: temp_e.pageX-$('canvas') .offset().left , y1: temp_e.pageY-$('canvas').offset().top,
x2: e.pageX-$('canvas').offset().left, y2: e.pageY-$( 'canvas').offset().top,
}
temp_e=e;
checkData(e),
; mouseup:function(e){
temp_e=null;
checkData(e);
mouseout:function(){
temp_e=null;
temp_draw=false;
}
})
$("#clean").on ("click",function(){
maxX=-1;
maxY =-1;
minX=99999;
obj.clearCanvas();
$("#save" ).on("點擊", function(){
var image=obj.getCanvasImage("png");
alert(image)
});
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