使用背景图像动态地将Unicode字符放在div中

时间:2012-10-08 11:37:39

标签: javascript html css

我有一张代表举重栏的图片:

enter image description here

我想在条形图的左侧和右侧放置Full Block Unicode字符(例如表示板)。

我试图用3个div来做这个:

  1. 杠铃离开:位于酒吧左侧的盘子,右对齐
  2. 杠铃中间:没有留空
  3. 杠铃右侧:栏右侧的牌照,左对齐
  4. 以下是带盘子的div的专业代表: enter image description here

    我以为我可以用浮动和div宽度的百分比来做到这一点,但我没有运气。

    这是我最近对js fiddle的尝试。


    更新

    我得到了我想要的答案,但根据评论,我发现使用Canvas是更好的路线。

    我能用这个html实现更好的结果:

    <div data-role="page" id="p1">
        <div  data-role="header"><h1>Header Page 1</h1></div>
    
        <div  data-role="content">
            <div class="bar-canvas">
                <canvas id="_barCanvas"></canvas>
            </div>
        </div>
        </div>
    
        <div  data-role="footer"><h4>Footer</h4></div>
    </div> 
    

    和这个js:

    var WIDTH_FACTOR    =    .8; //80% of screen size
    var HEIGHT_FACTOR    =    .1; //10% of height size
    var WEIGHT_SPACER    =     2;
    var ctx = $("#_barCanvas")[0].getContext("2d");
    
    ctx.canvas.width  = (window.innerWidth    *    WIDTH_FACTOR);
    ctx.canvas.height = (window.innerHeight    *    HEIGHT_FACTOR);
    
    var bar_width    =    ctx.canvas.width * .8;
    var bar_height    =    ctx.canvas.height * .1;
    var bar_x        =    (ctx.canvas.width - bar_width)
    var bar_y        =    (ctx.canvas.height * .5)    
    
    var plate_stop_width    =    bar_width * .01;
    var plate_stop_height    =    bar_height * 4;
    var plate_stop_y        =    bar_y - ((plate_stop_height - (bar_y / 2)));
    var rubber_plate_height    =    bar_height * 8;
    var rubber_plate_y        =    (ctx.canvas.height / 2) - (rubber_plate_height/2) + (bar_height/2);
    var small_plate_height    =    plate_stop_height;
    var small_plate_y        =    plate_stop_y;
    var left_plate_stop_x    =    bar_x + (bar_width * .3);
    var right_plate_stop_x    =    bar_x + (bar_width * .7);
    
    //Draw Bar
    ctx.fillStyle = "black";
    ctx.fillRect (bar_x, bar_y, bar_width, bar_height);
    
    //Draw Plate stop left
    ctx.fillStyle = "black";
    ctx.fillRect (left_plate_stop_x, plate_stop_y, plate_stop_width, plate_stop_height);
    
    //Draw Plate stop right
    ctx.fillStyle = "black";
    ctx.fillRect (right_plate_stop_x, plate_stop_y, plate_stop_width, plate_stop_height);
    
    //Draw 45 lb Plates
    var plate_width      = bar_width * .04;
    var current_plate_height     = 0;
    
    ctx.fillStyle    =    'red';
    ctx.fillRect(left_plate_stop_x - plate_width, rubber_plate_y, plate_width, rubber_plate_height);
    
    ctx.fillStyle    =    'red';
    ctx.fillRect(right_plate_stop_x + plate_stop_width, rubber_plate_y, plate_width, rubber_plate_height);
    

1 个答案:

答案 0 :(得分:1)

我做了一些改变你的标记和CSS。

Demo(仅在Chrome 22上测试)

HTML:

<div data-role="page" id="p1"> 
    <div  data-role="header"><h1>Header Page 1</h1></div> 

    <div  data-role="content">
    <div class="barbell-background">
        <div class="barbell-left">&#x2588;</div>
        <div class="barbell-right">&#x2588;</div>
    </div>
    </div> 

    <div  data-role="footer"><h4>Footer</h4></div> 
</div> 

CSS:

.barbell-background
{
    font-size:3em;
    line-height:1.4em;
    height:1.4em;
    position:relative;

    background-image:url('http://i.stack.imgur.com/ZmFY4.png');
    background-repeat:    no-repeat;
    background-position: center;
}
.barbell-left, .barbell-right
{
    position:absolute;
    color:red;
}
.barbell-left
{
    right:50%;
    margin-right:146px;
}
.barbell-right
{
    left:50%;
    margin-left:145px;
}​

正如Joachim Sauer所说,将红色方块用于div会更容易也更一致......

Another demo

HTML:

<div data-role="page" id="p1"> 
    <div  data-role="header"><h1>Header Page 1</h1></div> 

    <div  data-role="content">
    <div class="barbell-background">
        <div class="barbell-left"></div>
        <div class="barbell-right"></div>
    </div>
    </div> 

    <div  data-role="footer"><h4>Footer</h4></div> 
</div> 

CSS:

.barbell-background
{
    font-size:3em;
    line-height:1.3em;
    height:1.3em;
    position:relative;

    background-image:url('http://i.stack.imgur.com/ZmFY4.png');
    background-repeat:    no-repeat;
    background-position: center;
}
.barbell-left, .barbell-right
{
    position:absolute;
    background:red;
    width:0.5em;
    height:100%;
}
.barbell-left
{
    right:50%;
    margin-right:146px;
}
.barbell-right
{
    left:50%;
    margin-left:144px;
}​

在这两个演示中,你会看到一个像素“摇摆”。知道红色方块的内容我可以尝试解决它。​​