rotate and fit scatterD3

code.R

library(htmltools)
library(scatterD3)

sd3 <- scatterD3(x = mtcars$wt, y = mtcars$mpg, data=NULL, lab = rownames(mtcars),
          col_var = mtcars$cyl, symbol_var = mtcars$am,
          xlab = "Weight", ylab = "Mpg", col_lab = "Cylinders",
          symbol_lab = "Manual transmission", html_id = NULL, height = 300, width = 500)

browsable(
  tags$div(
    htmlwidgets::onRender(
      sd3,
"
function(el, x) {
debugger
  // hard coded for now assuming we want to rotate 45 degrees
  var degrees = 45;

  // https://stackoverflow.com/questions/622140/calculate-bounding-box-coordinates-from-a-rotated-rectangle
  function fitRect( rw,rh,degrees ){
    var radians = degrees * Math.PI / 180;
    
    var x1 = -rw/2,
        x2 = rw/2,
        x3 = rw/2,
        x4 = -rw/2,
        y1 = rh/2,
        y2 = rh/2,
        y3 = -rh/2,
        y4 = -rh/2;
  
    var x11 = x1 * Math.cos(radians) + y1 * Math.sin(radians),
        y11 = -x1 * Math.sin(radians) + y1 * Math.cos(radians),
        x21 = x2 * Math.cos(radians) + y2 * Math.sin(radians),
        y21 = -x2 * Math.sin(radians) + y2 * Math.cos(radians), 
        x31 = x3 * Math.cos(radians) + y3 * Math.sin(radians),
        y31 = -x3 * Math.sin(radians) + y3 * Math.cos(radians),
        x41 = x4 * Math.cos(radians) + y4 * Math.sin(radians),
        y41 = -x4 * Math.sin(radians) + y4 * Math.cos(radians);
  
    var x_min = Math.min(x11,x21,x31,x41),
        x_max = Math.max(x11,x21,x31,x41);
  
    var y_min = Math.min(y11,y21,y31,y41);
        y_max = Math.max(y11,y21,y31,y41);
  
    return [x_max-x_min,y_max-y_min];
  }
  
  // partial solution assuming width < height
  var width = el.offsetWidth;
  var height = el.offsetHeight;
  var sizes = fitRect(width, height, degrees);
  var newWidth = sizes[0];
  var newHeight = sizes[1];
  
  d3v4.select(el)
    .style('width', newWidth + 'px')
    .style('height', newHeight + 'px');
  
  d3v4.select(el).select('svg')
    .attr('transform','rotate(' + degrees + ')')
    .style('margin-top', (newHeight - height) / 2)
    .style('margin-left', (newWidth - width) / 2)
}
"
    )
  )
)