Changing colors on a canvas using CSS div style and JavaScript

Question

Changing colors on a canvas using CSS div style and JavaScript

Can anyone provide guidance on how to align these 3 divs horizontally?

Also, I am wondering if it is feasible to change the color of my circle based on a variable value. If possible, could someone please demonstrate with an example function?

  <html>
      <body>
        <style type="text/css">
        .circle
        {
        width:115px;
        height:115px;
        border-radius:250px;
        font-size:20px;
        color:#fff;
        line-height:115px;
        text-align:center;
        background:#000
        }
    </style>

     <div id="container"  style=" border: 2px coral solid; width:100%; height:120px;"> 

       <div class="circle">Hello</div>

       <div id="leadInfo" style="width:37%; height:115px; float:left; background-color:yellow;"> </div>

       <div id="leadInfo2" style="width:37.5%; height:115px; float:right;  background-color:blue;"> </div>

     </div>
</body>
</html>

javascript html css html5-canvas

Answer 1

Answer №1

Initially, you had this written

float: leftt;

It should be corrected to

float: left;

Furthermore, consider reducing the size of one of the yellow circles to less than 37.5%. Currently, it exceeds 100% in total causing a layout issue. Adjusting it to around 37% should resolve this problem.

Answer 2

Initially, you had this written

float: leftt;

It should be corrected to

float: left;

Furthermore, consider reducing the size of one of the yellow circles to less than 37.5%. Currently, it exceeds 100% in total causing a layout issue. Adjusting it to around 37% should resolve this problem.

Answer 3

Answer №2

<div id="container"  style=" border: 3px coral solid; width:100%; height:auto;"> 
    <div id="colorwheel" style="width:25%; float:left; border: 3px coral solid;">
    <canvas id="circlecanvas" width="100" height="100"></canvas>
    <script>
        var canvas = document.getElementById("circlecanvas");
        var context = canvas.getContext("2d");
        context.arc(50, 50, 50, 0, Math.PI * 2, false);
        context.fillStyle="red";
        context.fill()
    </script>
    </div>
    <div id="leadInfo" style="width:37.2%; height:108px; float:right; background-color:yellow;border:1px solid red;"> </div>
    <div id="contentArea" style="width:37.2%; height:108px; float:right; background-color:yellow;border:1px solid red;"> </div>
    <div style="clear:both"></div>
</div>

Answer 4

<div id="container"  style=" border: 3px coral solid; width:100%; height:auto;"> 
    <div id="colorwheel" style="width:25%; float:left; border: 3px coral solid;">
    <canvas id="circlecanvas" width="100" height="100"></canvas>
    <script>
        var canvas = document.getElementById("circlecanvas");
        var context = canvas.getContext("2d");
        context.arc(50, 50, 50, 0, Math.PI * 2, false);
        context.fillStyle="red";
        context.fill()
    </script>
    </div>
    <div id="leadInfo" style="width:37.2%; height:108px; float:right; background-color:yellow;border:1px solid red;"> </div>
    <div id="contentArea" style="width:37.2%; height:108px; float:right; background-color:yellow;border:1px solid red;"> </div>
    <div style="clear:both"></div>
</div>

Answer 5

Answer №3

When it comes to changing the color of a circle on canvas...

Unfortunately, once something is drawn on the canvas (like your circle), you cannot alter it directly.

This is because the canvas does not retain the information about where it placed your circle. The circle simply becomes an anonymous collection of pixels on the canvas.

Therefore, if you wish to modify anything on the canvas, you will need to clear the canvas and then redraw your circle using the desired fillStyle stored in a variable.

// define a variable to store the fill color
var myFillColor = "gold";

// clear the canvas
context.clearRect(0, 0, canvas.width, canvas.height);

// set the context.fillStyle to your variable
context.fillStyle = myFillColor;

// redraw your circle
context.beginPath();
context.arc(50, 50, 50, 0, Math.PI * 2, false);
context.fill();

It's important to note that context.arc is a path command and each sequence of path commands must start with context.beginPath. This signals to the browser that you are done drawing the previous path and starting a new one. Forgetting to use beginPath before creating a new path may result in all previous paths being redrawn during the next context.fill or context.stroke command.

Answer 6

When it comes to changing the color of a circle on canvas...

Unfortunately, once something is drawn on the canvas (like your circle), you cannot alter it directly.

This is because the canvas does not retain the information about where it placed your circle. The circle simply becomes an anonymous collection of pixels on the canvas.

Therefore, if you wish to modify anything on the canvas, you will need to clear the canvas and then redraw your circle using the desired fillStyle stored in a variable.

// define a variable to store the fill color
var myFillColor = "gold";

// clear the canvas
context.clearRect(0, 0, canvas.width, canvas.height);

// set the context.fillStyle to your variable
context.fillStyle = myFillColor;

// redraw your circle
context.beginPath();
context.arc(50, 50, 50, 0, Math.PI * 2, false);
context.fill();

It's important to note that context.arc is a path command and each sequence of path commands must start with context.beginPath. This signals to the browser that you are done drawing the previous path and starting a new one. Forgetting to use beginPath before creating a new path may result in all previous paths being redrawn during the next context.fill or context.stroke command.

Changing colors on a canvas using CSS div style and JavaScript

Answer №1

Answer №2

Answer №3

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