Saturday, 14 July 2018

Getting Unstuck: Day 10

As a result of signing up for Scratch Getting Unstuck I got a little carried away building a binary clock like this one in Scratch, but got really, really annoyed about not being able to place the elements just where I wanted. I remembered reading something a little while ago about the sb2 file format being an archive so I unzipped it and clocked that sprites have a scratchX and scratchY coordinate within the project.json file. That and figuring out that it uses SVG as the Vector format (why wouldn't you?) meant that I could replace the dodgy path with a circle element. This is the result and I'm quite pleased with it. Now, if only I could automagically use dynamic variable names I wouldn't have to have so many functions. Ah well.

Wednesday, 11 July 2018

Getting IE11 to play nicely with grid-area

I've been playing with CSS Grid layout lately within a Vue Component and I'm needing to place specific blocks within a grid, they are of an arbitrary position width and height and that all worked a treat within FireFox and Chrome... just not in, you guessed it, IE11.

So after banging my head against the issue for a few hours and trying everything I could think of I went to StackOverflow and asked. It seems I was being too helpful and adding the browser prefix rather than letting Vue do it for me. So far so good and StackOverflow provided the answer (thanks zero298), but it only went so far.

After looking at the issue some more I came up with the following script:

getStyle: function(x, y, a, b, c, d){
    var style = [];
    style.push("grid-row: " + x + ";");
    style.push("grid-row-span: " + d + ";");
    style.push("grid-column: " + y + ";");
    style.push("grid-column-span: " + c + ";");
    style.push("grid-area: " + x + " / " + y + " / " + a + " / " + b + ";");
    style.push("border: 1px solid white;");
    return style.join(" ");

I know that I'm using CSS for the border on the elements but IE11 doesn't support the grid-gap property for some reason, and rather than use browser detection, I figured it would be better to just do it this way for all elements. It's an interesting way of doing things as some of the properties are incompatible, which is why the decent bits of grid-area are left to the end and the IE11 specific bits get added first. IE11 doesn't support grid-area anyway so we're golden.

A little bit of extra work but should you examine the result in the bound style of an element you only see the appropriate CSS for the appropriate browser, which is nice. As I replied added in my original question on SO I just needed to trust Vue!


I got to thinking about the variables I was passing to the function above and realised that the c and d variables could be derived from subtracting the width from the x coordinate and the depth of the block from the y coordinate. Not only does this meant that the number of variables I was passing was reduced (something of an issue as the functions I was calling this from were making the calculations on the fly) but it also makes it much clearer. This is the new function:

getStyle: function(x, y, width, depth){
     * X=Row , Y=Column
     * IE11 has issues with grid-area as well as the syntax of grid-row and grid-column.
     * As such we need a polyfill for that that uses "-span" to indicate the "length" of the element
     * @param {number} x The "line" where the element should start on the horizontal grid (column) from the top
     * @param {number} y The "line" where the element should start on the vertical grid (row) from the left
     * @param {number} width The "line" where the element should end on the horizontal grid (column) from the top
     * @param {number} depth The "line" where the element should end on the vertical grid (row) from the left
    var style = [];
    style.push("grid-row: " + x);
    style.push("grid-row-span: " + (width - x));
    style.push("grid-column: " + y);
    style.push("grid-column-span: " + (depth - y));
    style.push("grid-area: " + x + " / " + y + " / " + width + " / " + depth);
    return style.join("; ");

Thursday, 28 June 2018

Colour shading with JavaScript

Shading a colour can be an utter pain but when I came across this script from CSS-TRICKS I was happy as a pig in muck. At least I was until I had to change the colour received via a call to getComputedStyle. getComputedStyle returns the colour in this format rgb(RedDecimalNumber, GreenDecimalNumber, BlueDecimalNumber) (red is rgb(255,0,0)) rather than the #RedHexadecimalNumberGreenHexadecimalNumberBlueHexadecimalNumber (red is #ff0000). The original script I was using was the one linked above so I had to convert the colour from getComputedStyle to hexadecimal, alter its shade and return it back to the original element's style as hexadecimal again.

This method seemed overly complicated, and I clocked that I didn't need to return it to the element as hexadecimal but could use it just as an RGB string in the inline CSS. Then I got to looking at the original script and realised that as getComputedStyle returns an RGB string, I could rewrite the original function to use a regex function and return that to the inline CSS instead. The following is the function:


I always forget that replace can take a function as the second argument but in this instance, it's cool that it does. The following is a less ES6y version:

o.replace(/\d+/g, function(c){
  if((parseInt(c, 10) + s) >= 255){
    return 255
    if((parseInt(c, 10) + s) <= 0){
      return 0
      return parseInt(c, 10) + s

Fun eh?

Monday, 25 June 2018

Vue simple-webpack on c9

I've lost track of how many times I've had to re-research this issue so I thought I'd best document it here. When playing through tutorials on Vue I often use c9 but had problems figuring out how to get the simple-webpack versions running. This, then, is how to get it up and running with a the vue-cli.

Open webpack.config.js and turn off the host check by adding this to the devServer object:

devServer: {
    historyApiFallback: true,
    noInfo: true,
    overlay: true,
    disableHostCheck: true

Then open package.json and alter the dev scripts object so it looks like this:

"cross-env NODE_ENV=development webpack-dev-server --host $IP --port $PORT --open --hot"

Of course, this works for me but YMMV.

Sunday, 22 April 2018

A new outdoor venue for Witchford Archers

One of the things that always impresses me about Witchford Archers is just how well we work together! Last year when we had to move venue, we worked like crazy to move all of our kit. While it might seem that all we do is shoot, and drink afterwards, in the background, there's so much activity it makes me positive about humanity!
We prepared our new outdoor venue yesterday. Nick has moved heaven and earth to secure the playing fields at Sutton C of E (VC) Primary School as a lovely place to shoot when the sun's out. Yesterday we made significant progress with building a... shed doesn't do it justice, to be honest as it's a work of art!
Designed and architected by Alan and Chris loads of work went into sourcing and preparing materials as cheaply as possible.
Aided my Derek, Nick, Oliwia and Dominic it was erected in a lovely shady spot in the playing fields over the course of Saturday the 21st of April 2018. The following show just what was accomplished!

Wednesday, 4 April 2018

Detect IE11

I'm old enough to remember why we needed jQuery: IE6.

Now I'm less used to using it and prefer vanilla JS but still wish for its universal levelling of the playing field because now I have to deal with the peculiarities of IE11 on a near daily basis so, thanks to this answer on StackOverflow, you'll often see this peppering my code:

    // Do something peculiar...

Monday, 26 March 2018

Rock your lobster

I've moved jobs, and that's all well and good, but the best thing is meeting the new people. One of whom suggested I read 12 Rules for Life by Jordan Peterson (thanks, Gorka). It's an interesting read/listen, not least because his first rule is all to do with standing up straight... and something to do with lobsters...

The thing is, my back is borked with my vertebrae all on the way to being fused together (bloody AS). Thus I'm unable to even look behind me unless I turn around (got to love mirrors in cars).

And don't get me started on Yoga! I've tried it, and I thought it was a lovely idea (I even bought a mat on offer in Sainsbury's), but I lasted all of 5 and a half sessions until I knocked it on the head. The straw that broke the camels back was the instructor's insistence that we gradually curve our backs from sitting up until we were lying flat on our backs, at which point there was an almighty slap! There was no gradual curving involved; I just crashed back because I can't gradually curve my back as it's a solid lump. Unless that is, Maria's has expanded all of her strength pummeling it once a month, at that point it sort of moves freely for a little while (or it feels as if it does anyway, or I don't care because I'm too relaxed to notice).

So never put off a decent massage (thanks, Maria) and don't worry too much about standing up straight. He, Mr Peterson, does suggest other things. If you can't stand up straight, you can do other things like looking someone squarely in the face and putting your shoulders back... he even trots out the old adage about smiling making you feel better, even if you're not feeling all that chipper to start with (It's true as well).