Javascript 画布上的自由绘图变得模糊
当我在织物上使用自由绘图时,有时绘图会变得模糊! 这是一幅演示问题的图片:Javascript 画布上的自由绘图变得模糊,javascript,canvas,fabricjs,Javascript,Canvas,Fabricjs,当我在织物上使用自由绘图时,有时绘图会变得模糊! 这是一幅演示问题的图片: 这是完整的代码: var Operations = { freeDrawing:0, selection:1, move:2, erease:3 }; var Options = { EraseBrush:"#ffffff", DrawingBrushColor:'#005E7A', DrawingBrushWidth:'16', PrushPattern
这是完整的代码:
var Operations = {
freeDrawing:0,
selection:1,
move:2,
erease:3
};
var Options = {
EraseBrush:"#ffffff",
DrawingBrushColor:'#005E7A',
DrawingBrushWidth:'16',
PrushPattern:'pencil',
EraserWidth:'24'
};
var BrushePatterns = {
Pencil:'pencil',
Circle:'circle',
Spray:'spray',
Pattern:'pattern',
HLine:'hline',
VLine:'vline',
Square:'square',
Diamond:'diamond',
Texture:'texture'
};
var app = (function(){
var application={};
var canvas = window.__canvas = new fabric.Canvas('board',{defaultCursor :'crosshair',isDrawingMode:true,selection:true});
fabric.Object.prototype.set({
transparentCorners: false,
cornerColor: 'rgba(102,153,255,0.5)',
cornerSize: 12,
padding:5});
canvas.freeDrawingBrush = new fabric['PencilBrush'](canvas);
if (canvas.freeDrawingBrush) {
canvas.freeDrawingBrush.color = Options.DrawingBrushColor;
canvas.freeDrawingBrush.width = Options.DrawingBrushWidth;
canvas.freeDrawingBrush.shadow = new fabric.Shadow({
blur: 0,
offsetX: 0,
offsetY: 0,
affectStroke: true,
color: Options.DrawingBrushColor,
});
}
canvas.on('mouse:down',function(e){
});
canvas.on('mouse:up',function(e){
});
canvas.on('mouse:move',function(e){
});
/* function resizeCanvas() {
setTimeout(()=>{
var canvasContainer=document.getElementById('ccontainer');
canvas.setHeight(canvasContainer.clientHeight);
canvas.setWidth(canvasContainer.clientWidth);
canvas.renderAll();
},500);
}*/
application.activateDrawingMode=function(){
toggleOperation(Operations.freeDrawing);
}
application.activateEraseMode = function(){
toggleOperation(Operations.erease);
}
application.activateMousePointerMode = function(){
toggleOperation(Operations.selection);
}
function toggleOperation(operation){
if(operation === Operations.freeDrawing){
/*canvas.isDrawingMode=true;
canvas.selection = false;
canvas.freeDrawingBrush.color = Options.DrawingBrushColor;
canvas.freeDrawingBrush.width = Options.DrawingBrushWidth;*/
}
else if(operation === Operations.erease){
canvas.selection = false;
canvas.freeDrawingBrush.color = Options.EraseBrush;
canvas.freeDrawingBrush.width = Options.EraserWidth;
}
else if(operation === Operations.selection){
canvas.isDrawingMode = false;
canvas.selection = true;
}
}
//resize on init
//resizeCanvas();
application.canvas=canvas;
return application;
})();
function freeDrawingButtonclicked(){
app.activateDrawingMode();
}
function pointerButtonClicked(){
app.activateMousePointerMode();
}
function eraserButtonClicked(){
app.activateEraseMode();
}
我使用fabric的1.7.19版本,我有一个主页,其中包括fabric js文件和上面提到的文件。ASP.Net核心web应用程序正在使用这些文件。我看不出这个代码和那个代码之间有什么区别,但我的代码产生了这些模糊,我不知道为什么 整晚拉我的头发之后,如果你将
canvas.freeDrawingBrush.width
的值作为字符串传递,在引号'14'
之间,你会得到这个模糊度,但是如果你将这个值作为整数传递,你就不会得到这个模糊度。我认为这是一个bug,我将在Fabric.JS
GitHub存储库中创建一个问题。不管怎样,我只是想让你知道问题出在哪里,所以我帮别人留了头发。干杯 我在react中工作时,并没有通过传递数字来解决问题,而是将数据从一个组件传递到另一个组件,最后将数字解析为整数,这样就解决了问题:
canvas.freedrawingprush.width=parseInt(props.width,10)
但是感谢@Mahmoud,因为它指明了方向 是的,主要原因是没有将
整数
值传递给该属性!伙计,他们应该在文档中提到这一点!!!与您的问题没有直接关系,但我得到了那些模糊的线条,这是因为我使用css在cavas上设置了一个边框!我去掉了边界,由于某种原因,模糊消失了。。。希望它能帮助别人。