Currently, I am attempting to construct a triangular slider that resembles the one shown in the example:
While I can generate the triangle visually, the technical aspects like enabling node dragging, restricting its movement within the triangle boundaries, and calculating values based on the node's position elude me at this moment.
If anyone is aware of a plugin that can assist with this functionality, kindly share it. Alternatively, any guidance or support would be greatly valued.
To drag the node, utilize Jquery.UI draggable and include a drag event that returns false if the point falls outside the triangle's bounds (refer to: for the algorithm). It is essential to ascertain the coordinates of the triangle's vertices (http://jsfiddle.net/dLzWr/) .
//retrieve the top point of the triangle
function getTopPoint(t){
var pos = t.offset();
//include border dimensions in the offset calculation
var leftBorder = parseInt(t.css("border-left-width"),10);
var topBorder = parseInt(t.css("border-top-width"),10);
pos.left += leftBorder;
pos.top += topBorder;
return pos;
}
//fetch the bottom left point of the triangle
function bottomLeftPoint(t){
var top = getTopPoint(t);
top.top += parseInt(t.css("border-bottom-width"),10);
top.left -= parseInt(t.css("border-left-width"),10);
return top;
}
//obtain the bottom right point of the triangle
function bottomRightPoint(t){
var top = getTopPoint(t);
top.top += parseInt(t.css("border-bottom-width"),10);
top.left += parseInt(t.css("border-right-width"),10);
return top;
}
In examining the fiddle, you can calculate the distance between each vertex and the current point during the draw event, using this information to determine the values.
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