What are the methods for creating a diagonal line using GWT or the combination of HTML, CSS, and JavaScript?

I'm currently developing a web application that requires connecting elements with lines. I would prefer the lines to not be limited to just horizontal or vertical paths. Additionally, I need to be able to detect clicks on these lines. I've explored several alternatives so far:

Utilize CSS rotation

I can create a div or hr element with the specific length and then apply the CSS transform property in their style. There is a related solution available somewhere on this platform.

Advantages:

  • Simplicity.
  • Possibility to detect clicks.

Disadvantages:

  • Requires browser-specific CSS.

Generate the image on the server

I could design a web page that accepts fromx, fromy, tox, and toy as GET or POST parameters and outputs the image of the line.

Advantages:

  • Simplicity.
  • Standardization.

Disadvantages:

  • Inability to detect clicks if lines intersect (which they do).
  • Necessitates server interaction.

Use multiple small divs

I could create numerous 5x5 divs and position them to create a line.

Advantages:

  • Possibility to detect clicks.
  • Standardized approach.

Disadvantages:

  • Complexity.

Consider Giving Up

If all else fails, I may choose to use gwt-connectors. Although it only supports drawing horizontal and vertical lines, it is very easy to use and allows for moving connected objects.

Which option would you recommend? Are there any other alternatives that I may have overlooked?

javascripthtmlcssgwt

Answer №1

If your browser supports CSS3, you can check out this example: http://jsfiddle.net/rudiedirkx/MKkxX/

When it comes to connecting dots, the process involves numerous small calculations that need to be performed on the server side. Each line will have different rotations, translations, and lengths, requiring a significant amount of computation. However, this complexity is greatly simplified for the client, especially if CSS3 is supported.

Answer №2

My choice would be - a versatile JavaScript library for creating and manipulating vector graphics

Answer №3

To create a canvas element and draw lines using scripting (such as jQuery), you can leverage the support for canvas starting from IE9 and utilize the IECanvas polyfill for compatibility.

By targeting elements with the class 'wireframe', I dynamically insert canvas elements within each one, ensuring that the canvas inherits the same color as the border for a seamless design.

$(document).ready(function() {

var id = 1;

$('.wireframe').each(function() {

    var $this = $(this);
    var w = $this.width();
    var h = $this.height();


    //append canvas element with specified width and height
    $this.append('<canvas id="canvas' + id + '" width="' + w + 'px" height="' + h + 'px">');

    var canvas = document.getElementById('canvas' + id);
    var ctx = canvas.getContext('2d');

    ctx.strokeStyle = $(this).css("borderColor");

    ctx.beginPath();
    ctx.moveTo(0,0);
    ctx.lineTo(w,h);
    ctx.moveTo(0,h);
    ctx.lineTo(w,0);

    ctx.stroke();

    id++;
});

});

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