画布响应媒体屏幕最小宽度-FabricJS

问题描述 投票:3回答:2

我尝试为每种分辨率调整画布,所以我首先使用css并为每种分辨率放置媒体屏幕。

@media screen and (min-width: 320px) {
  #c {   -webkit-transform : scale(0.38);
-webkit-transform-origin : 0 0; }

https://jsfiddle.net/qj3oyzs8/

它对我有用,但是所有对象都无法正确拖动,调整大小或旋转。一种解决方案是应用zoomOut和zoomIn,例如:

http://jsfiddle.net/Q3TMA/662/

现在我需要知道的帮助,如何捕获分辨率才能在浏览器中正确打开画布比例


编辑

function screencan() {
   var widthscrencan = (window.innerWidth > 0) ? window.innerWidth : screen.width;

/*

In if has to have the same scale the css
@media screen and (min-width: 320px) {
  #c {   -webkit-transform : scale(0.38);
-webkit-transform-origin : 0 0; }
}


*/
    if(widthscrencan <= 360 ) {
           // Zoom Out


 function zoomOut() {
        // TODO limit max cavas zoom out

        canvasScale = canvasScale / SCALE_FACTOR;

        canvas.setHeight(canvas.getHeight() * (1 / SCALE_FACTOR));
        canvas.setWidth(canvas.getWidth() * (1 / SCALE_FACTOR));

        var objects = canvas.getObjects();
        for (var i in objects) {
            var scaleX = objects[i].scaleX;
            var scaleY = objects[i].scaleY;
            var left = objects[i].left;
            var top = objects[i].top;

            var tempScaleX = scaleX * (1 / SCALE_FACTOR);
            var tempScaleY = scaleY * (1 / SCALE_FACTOR);
            var tempLeft = left * (1 / SCALE_FACTOR);
            var tempTop = top * (1 / SCALE_FACTOR);

            objects[i].scaleX = tempScaleX;
            objects[i].scaleY = tempScaleY;
            objects[i].left = tempLeft;
            objects[i].top = tempTop;

            objects[i].setCoords();
        }

        canvas.renderAll();        
    }

    }               
 }
 window.onload = screencan;

不起作用

感谢您的帮助

javascript css html5-canvas media-queries fabricjs
2个回答
1
投票

快乐!我明白了:D

唯一的问题是,需要重新调整浏览器的大小。因为window.onload = zoomIn;

,因此有必要刷新页面

解决方案!我删除了CSS的查询屏幕和:

widthscrencan = (window.innerWidth > 0) ? window.innerWidth : screen.width; // capture width screen onload
canvasScale = 1; //global  

   if (widthscrencan <=360){ 

      function zoomIn() {
          var SCALE_FACTOR = .37;
          canvasScale = canvasScale * SCALE_FACTOR;

      canvas.setHeight(canvas.getHeight() * SCALE_FACTOR);
      canvas.setWidth(canvas.getWidth() * SCALE_FACTOR);

      var objects = canvas.getObjects();
      for (var i in objects) {
          var scaleX = objects[i].scaleX;
          var scaleY = objects[i].scaleY;
          var left = objects[i].left;
          var top = objects[i].top;

          var tempScaleX = scaleX * SCALE_FACTOR;
          var tempScaleY = scaleY * SCALE_FACTOR;
          var tempLeft = left * SCALE_FACTOR;
          var tempTop = top * SCALE_FACTOR;

          objects[i].scaleX = tempScaleX;
          objects[i].scaleY = tempScaleY;
          objects[i].left = tempLeft;
          objects[i].top = tempTop;

          objects[i].setCoords();
      }


      canvas.renderAll();
      alert(widthscrencan+' function 360'); 

  }

   window.onload = zoomIn;
 }






   if ((widthscrencan >=361) || (widthscrencan ==768)){ 

            function zoomIn768() {
          var SCALE_FACTOR = .45;
          canvasScale = canvasScale * SCALE_FACTOR;

          canvas.setHeight(canvas.getHeight() * SCALE_FACTOR);
          canvas.setWidth(canvas.getWidth() * SCALE_FACTOR);

          var objects = canvas.getObjects();
          for (var i in objects) {
              var scaleX = objects[i].scaleX;
              var scaleY = objects[i].scaleY;
              var left = objects[i].left;
              var top = objects[i].top;

              var tempScaleX = scaleX * SCALE_FACTOR;
              var tempScaleY = scaleY * SCALE_FACTOR;
              var tempLeft = left * SCALE_FACTOR;
              var tempTop = top * SCALE_FACTOR;

              objects[i].scaleX = tempScaleX;
              objects[i].scaleY = tempScaleY;
              objects[i].left = tempLeft;
              objects[i].top = tempTop;

              objects[i].setCoords();
          }


          canvas.renderAll();
          alert(widthscrencan+' function 768'); 


        }
          window.onload = zoomIn768;
    }

   if ((widthscrencan >=769) || (widthscrencan ==992)){ 

            function zoomIn992() {
          var SCALE_FACTOR = .5;
          canvasScale = canvasScale * SCALE_FACTOR;

          canvas.setHeight(canvas.getHeight() * SCALE_FACTOR);
          canvas.setWidth(canvas.getWidth() * SCALE_FACTOR);

          var objects = canvas.getObjects();
          for (var i in objects) {
              var scaleX = objects[i].scaleX;
              var scaleY = objects[i].scaleY;
              var left = objects[i].left;
              var top = objects[i].top;

              var tempScaleX = scaleX * SCALE_FACTOR;
              var tempScaleY = scaleY * SCALE_FACTOR;
              var tempLeft = left * SCALE_FACTOR;
              var tempTop = top * SCALE_FACTOR;

              objects[i].scaleX = tempScaleX;
              objects[i].scaleY = tempScaleY;
              objects[i].left = tempLeft;
              objects[i].top = tempTop;

              objects[i].setCoords();
          }


          canvas.renderAll();
          alert(widthscrencan+' function 992'); 


        }
          window.onload = zoomIn992;
    }

      if ((widthscrencan >=993) || (widthscrencan ==1200)){ 

            function zoomIn1200() {
          var SCALE_FACTOR = .9;
          canvasScale = canvasScale * SCALE_FACTOR;

          canvas.setHeight(canvas.getHeight() * SCALE_FACTOR);
          canvas.setWidth(canvas.getWidth() * SCALE_FACTOR);

          var objects = canvas.getObjects();
          for (var i in objects) {
              var scaleX = objects[i].scaleX;
              var scaleY = objects[i].scaleY;
              var left = objects[i].left;
              var top = objects[i].top;

              var tempScaleX = scaleX * SCALE_FACTOR;
              var tempScaleY = scaleY * SCALE_FACTOR;
              var tempLeft = left * SCALE_FACTOR;
              var tempTop = top * SCALE_FACTOR;

              objects[i].scaleX = tempScaleX;
              objects[i].scaleY = tempScaleY;
              objects[i].left = tempLeft;
              objects[i].top = tempTop;

              objects[i].setCoords();
          }


          canvas.renderAll();
          alert(widthscrencan+' function 1200'); 


        }
          window.onload = zoomIn1200;
    }


      if (widthscrencan >=1300){ 

            function zoomIn1300() {
          var SCALE_FACTOR = 1.01;
          canvasScale = canvasScale * SCALE_FACTOR;

          canvas.setHeight(canvas.getHeight() * SCALE_FACTOR);
          canvas.setWidth(canvas.getWidth() * SCALE_FACTOR);

          var objects = canvas.getObjects();
          for (var i in objects) {
              var scaleX = objects[i].scaleX;
              var scaleY = objects[i].scaleY;
              var left = objects[i].left;
              var top = objects[i].top;

              var tempScaleX = scaleX * SCALE_FACTOR;
              var tempScaleY = scaleY * SCALE_FACTOR;
              var tempLeft = left * SCALE_FACTOR;
              var tempTop = top * SCALE_FACTOR;

              objects[i].scaleX = tempScaleX;
              objects[i].scaleY = tempScaleY;
              objects[i].left = tempLeft;
              objects[i].top = tempTop;

              objects[i].setCoords();
          }


          canvas.renderAll();
          alert(widthscrencan+' function 1300'); 


        }
          window.onload = zoomIn1300;
    }

0
投票

不是使用OR运算,而是使用AND运算,它对我来说非常完美这是您的修改后的代码

谢谢。 :)

var canvas = new fabric.Canvas('c');
canvas.backgroundColor = "#Ffaafa";

var widthscrencan = (window.innerWidth > 0) ? window.innerWidth : screen.width; // capture width screen onload
var canvasScale = 1; //global  
var SCALE_FACTOR = 1.2;


window.onload = function () {
    
    var text = new fabric.Text('Text Here', { 
    left: 100, 
    top: 50 
    });
    canvas.add(text);
    
    if (widthscrencan <=360){ 
       zoomIn();
     }
    else if ((widthscrencan >=361) && (widthscrencan <= 768)){ 
          zoomIn768();
    }
    else if ((widthscrencan >=769) && (widthscrencan <= 992)){ 
          zoomIn992();
    }
    else if ((widthscrencan >=993) && (widthscrencan <= 1200)){ 
          zoomIn1200();
    }
    else  if (widthscrencan >=1300){ 
         zoomIn1300();
    }

};



function zoomIn() {
          var SCALE_FACTOR = .37;
          canvasScale = canvasScale * SCALE_FACTOR;

      canvas.setHeight(canvas.getHeight() * SCALE_FACTOR);
      canvas.setWidth(canvas.getWidth() * SCALE_FACTOR);

      var objects = canvas.getObjects();
      for (var i in objects) {
          var scaleX = objects[i].scaleX;
          var scaleY = objects[i].scaleY;
          var left = objects[i].left;
          var top = objects[i].top;

          var tempScaleX = scaleX * SCALE_FACTOR;
          var tempScaleY = scaleY * SCALE_FACTOR;
          var tempLeft = left * SCALE_FACTOR;
          var tempTop = top * SCALE_FACTOR;

          objects[i].scaleX = tempScaleX;
          objects[i].scaleY = tempScaleY;
          objects[i].left = tempLeft;
          objects[i].top = tempTop;

          objects[i].setCoords();
      }


      canvas.renderAll();
    alert('Display Area Width : '+widthscrencan+'px Function Called zoomIn'); 
  }
  
  
  function zoomIn768() {
          var SCALE_FACTOR = .45;
          canvasScale = canvasScale * SCALE_FACTOR;

          canvas.setHeight(canvas.getHeight() * SCALE_FACTOR);
          canvas.setWidth(canvas.getWidth() * SCALE_FACTOR);

          var objects = canvas.getObjects();
          for (var i in objects) {
              var scaleX = objects[i].scaleX;
              var scaleY = objects[i].scaleY;
              var left = objects[i].left;
              var top = objects[i].top;

              var tempScaleX = scaleX * SCALE_FACTOR;
              var tempScaleY = scaleY * SCALE_FACTOR;
              var tempLeft = left * SCALE_FACTOR;
              var tempTop = top * SCALE_FACTOR;

              objects[i].scaleX = tempScaleX;
              objects[i].scaleY = tempScaleY;
              objects[i].left = tempLeft;
              objects[i].top = tempTop;

              objects[i].setCoords();
          }


          canvas.renderAll();
        alert('Display Area Width : '+widthscrencan+'px Function Called zoomIn768'); 

        }
        
        
        function zoomIn992() {
          var SCALE_FACTOR = .5;
          canvasScale = canvasScale * SCALE_FACTOR;

          canvas.setHeight(canvas.getHeight() * SCALE_FACTOR);
          canvas.setWidth(canvas.getWidth() * SCALE_FACTOR);

          var objects = canvas.getObjects();
          for (var i in objects) {
              var scaleX = objects[i].scaleX;
              var scaleY = objects[i].scaleY;
              var left = objects[i].left;
              var top = objects[i].top;

              var tempScaleX = scaleX * SCALE_FACTOR;
              var tempScaleY = scaleY * SCALE_FACTOR;
              var tempLeft = left * SCALE_FACTOR;
              var tempTop = top * SCALE_FACTOR;

              objects[i].scaleX = tempScaleX;
              objects[i].scaleY = tempScaleY;
              objects[i].left = tempLeft;
              objects[i].top = tempTop;

              objects[i].setCoords();
          }


          canvas.renderAll();
          alert('Display Area Width : '+widthscrencan+'px Function Called zoomIn992'); 

        }
        
        
        function zoomIn1200() {
          var SCALE_FACTOR = .9;
          canvasScale = canvasScale * SCALE_FACTOR;

          canvas.setHeight(canvas.getHeight() * SCALE_FACTOR);
          canvas.setWidth(canvas.getWidth() * SCALE_FACTOR);

          var objects = canvas.getObjects();
          for (var i in objects) {
              var scaleX = objects[i].scaleX;
              var scaleY = objects[i].scaleY;
              var left = objects[i].left;
              var top = objects[i].top;

              var tempScaleX = scaleX * SCALE_FACTOR;
              var tempScaleY = scaleY * SCALE_FACTOR;
              var tempLeft = left * SCALE_FACTOR;
              var tempTop = top * SCALE_FACTOR;

              objects[i].scaleX = tempScaleX;
              objects[i].scaleY = tempScaleY;
              objects[i].left = tempLeft;
              objects[i].top = tempTop;

              objects[i].setCoords();
          }


          canvas.renderAll();
          alert('Display Area Width : '+widthscrencan+'px Function Called zoomIn1200'); 


        }
        
        
        function zoomIn1300() {
          var SCALE_FACTOR = 1.01;
          canvasScale = canvasScale * SCALE_FACTOR;

          canvas.setHeight(canvas.getHeight() * SCALE_FACTOR);
          canvas.setWidth(canvas.getWidth() * SCALE_FACTOR);

          var objects = canvas.getObjects();
          for (var i in objects) {
              var scaleX = objects[i].scaleX;
              var scaleY = objects[i].scaleY;
              var left = objects[i].left;
              var top = objects[i].top;

              var tempScaleX = scaleX * SCALE_FACTOR;
              var tempScaleY = scaleY * SCALE_FACTOR;
              var tempLeft = left * SCALE_FACTOR;
              var tempTop = top * SCALE_FACTOR;

              objects[i].scaleX = tempScaleX;
              objects[i].scaleY = tempScaleY;
              objects[i].left = tempLeft;
              objects[i].top = tempTop;

              objects[i].setCoords();
          }


          canvas.renderAll();
          alert('Display Area Width : '+widthscrencan+'px Function Called zoomIn1300'); 

  
        }
<canvas id="c" width="800" height="550"></canvas>



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