Easy Flags: Difference between revisions

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Line 1: Line 1:
<pre id='shellbody'>
<pre id='shellbody'>
<canvas width=150 height=100></canvas>
<div style='background:silver;padding:5px'>
<canvas id='usr' width=200 height=100></canvas>
<canvas id='ans' width=200 height=100 style='display:none'></canvas>
</div>
</pre>
</pre>
<pre id='shelljs'>
<pre id='shelljs'>
drawFlag(document.querySelector('canvas').getContext('2d'));
--snippet-usr--
drawFlag(document.getElementById('usr').getContext('2d'));
(()=>{
  --snippet-ans--
  drawFlag(document.getElementById('ans').getContext('2d'));
})();
let [a,b] = ['usr','ans']
    .map(id=>document.getElementById(id))
    .map(elem=>elem.getContext('2d').getImageData(0,0,elem.width,elem.height))
let diff = a.data.map((v,i) => v===b.data[i]?1:0).reduce((acc,v)=>acc+v,0)*100/a.data.length;
let fb = document.createElement('div');
fb.innerText = `Score: ${diff.toFixed(1)}`;
document.body.appendChild(fb);
fetch(`/reportProgress.php?uid=--snippet-uid--&qid=--snippet-qid--&score=${diff}`);
</pre>
</pre>
==Libya==
==Libya==
<div class='qu'>
<div class='qu'>
What is 6 times 7?
The flag of Libya, until 2011, was a simple green rectangle.
 
Try the program as it is given, then change it so that the green rectangle is 150 wide.
 
[[Image:flaglibya.png|border]]
<pre class='usr'>
<pre class='usr'>
function drawFlag(ctx)
function drawFlag(ctx)
{
{
   ctx.fill = 'green';
   ctx.fillStyle = 'green';
   ctx.fillRect(0,0,75,100);
   ctx.fillRect(0,0,75,100);
}   
}   
Line 18: Line 40:
function drawFlag(ctx)
function drawFlag(ctx)
{
{
   ctx.fill = 'green';
   ctx.fillStyle = 'green';
   ctx.fillRect(0,0,150,100);
   ctx.fillRect(0,0,150,100);
}   
}   
</pre>
</div>
==France==
<div class=qu title='France'>
The flag of France is blue, white  and red. 
The code given draws only one of the three rectangles required and it is in the wrong place.<br/>
[[Image:flag_guide_france.png|border]]
<pre class=usr>
function drawFlag(ctx)
{
  ctx.fillStyle = 'blue';
  ctx.fillRect(50,0,50,100);
}
</pre>
<pre class=ans>function drawFlag(ctx)
{
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,50,100);
  ctx.fillStyle = 'white';
  ctx.fillRect(50,0,50,100);
  ctx.fillStyle = 'red';
  ctx.fillRect(100,0,50,100);
}
</pre>
</div>
==Germany==
<div class=qu title='Germany'>
The flag of Germany is black, red and yellow.
Only one of the three rectangles has been drawn - and that one is in the wrong place.<br/>
[[Image:flaggermany.png|border]] <pre class=usr>
function drawFlag(ctx)
{
  ctx.fillStyle = 'yellow';
  ctx.fillRect(0,0,150,30);
}
</pre>
<pre class=ans>
function drawFlag(ctx)
{
  ctx.fillStyle = 'black';
  ctx.fillRect(0,0,150,30);
  ctx.fillStyle = 'red';
  ctx.fillRect(0,30,150,30);
  ctx.fillStyle = 'yellow';
  ctx.fillRect(0,60,150,30);
}
</pre>
</div>
==Switzerland==
<div class=qu title='Switzerland' imgOut='flag.png' width='100' height='100'
  className="Raster" level='1'>
The flag of Switzerland is red with a white cross in the center.
The background has been filled in. Use white rectangles to draw the cross.<br/>
[[Image:swissflag.png|border]] <pre class=usr>function drawFlag(ctx)
{
  ctx.fillStyle = 'red';
  ctx.fillRect(0,0,100,100);
}
</pre>
<pre class=ans>
function drawFlag(ctx)
{
  ctx.fillStyle = 'red';
  ctx.fillRect(0,0,100,100);
  ctx.fillStyle = 'white';
  ctx.fillRect(10,40,80,20);
  ctx.fillRect(40,10,20,80);
}
</pre></div>
==United Arab Emirates==
<div class=qu title='UAE' imgOut='flag.png' width='200' height='99'>
*The flag of United Arab Emirates has a red bar taking one quarter of the rectangle.
*The rectangle is 200 by 99.
[[Image:Flaguaeplain.png|border]]
<div class='dhint' title="How to draw a circle">
</div>
<pre class=usr>
function drawFlag(ctx)
{
  ctx.fillStyle = 'white';
  ctx.fillRect(50,0,150,33);
  ctx.fillStyle = 'red';
}
</pre>
<pre class=ans>
function drawFlag(ctx)
{
  ctx.fillStyle = 'red';
  ctx.fillRect(0,0,50,99);
  ctx.fillStyle = 'black';
  ctx.fillRect(50,0,150,33);
  ctx.fillStyle = 'white';
  ctx.fillRect(50,33,150,33);
  ctx.fillStyle = 'green';
  ctx.fillRect(50,66,150,33);
}
</pre>
</pre>
</div>
</div>

Latest revision as of 20:59, 1 August 2021

<div style='background:silver;padding:5px'>
<canvas id='usr' width=200 height=100></canvas>
<canvas id='ans' width=200 height=100 style='display:none'></canvas>
</div>
--snippet-usr--
drawFlag(document.getElementById('usr').getContext('2d'));
(()=>{
  --snippet-ans--
  drawFlag(document.getElementById('ans').getContext('2d'));
})();
let [a,b] = ['usr','ans']
    .map(id=>document.getElementById(id))
    .map(elem=>elem.getContext('2d').getImageData(0,0,elem.width,elem.height))
let diff = a.data.map((v,i) => v===b.data[i]?1:0).reduce((acc,v)=>acc+v,0)*100/a.data.length;
let fb = document.createElement('div');
fb.innerText = `Score: ${diff.toFixed(1)}`;
document.body.appendChild(fb);
fetch(`/reportProgress.php?uid=--snippet-uid--&qid=--snippet-qid--&score=${diff}`);

Libya

The flag of Libya, until 2011, was a simple green rectangle.

Try the program as it is given, then change it so that the green rectangle is 150 wide.

function drawFlag(ctx)
{
  ctx.fillStyle = 'green';
  ctx.fillRect(0,0,75,100);
}  
function drawFlag(ctx)
{
  ctx.fillStyle = 'green';
  ctx.fillRect(0,0,150,100);
}  

France

The flag of France is blue, white and red. The code given draws only one of the three rectangles required and it is in the wrong place.

function drawFlag(ctx)
{
  ctx.fillStyle = 'blue';
  ctx.fillRect(50,0,50,100);
}
function drawFlag(ctx)
{
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,50,100);
  ctx.fillStyle = 'white';
  ctx.fillRect(50,0,50,100); 
  ctx.fillStyle = 'red';
  ctx.fillRect(100,0,50,100); 
}

Germany

The flag of Germany is black, red and yellow.

Only one of the three rectangles has been drawn - and that one is in the wrong place.

function drawFlag(ctx)
{
  ctx.fillStyle = 'yellow';
  ctx.fillRect(0,0,150,30);
} 
function drawFlag(ctx)
{
  ctx.fillStyle = 'black';
  ctx.fillRect(0,0,150,30);
  ctx.fillStyle = 'red';
  ctx.fillRect(0,30,150,30);
  ctx.fillStyle = 'yellow';
  ctx.fillRect(0,60,150,30);
}

Switzerland

The flag of Switzerland is red with a white cross in the center.

The background has been filled in. Use white rectangles to draw the cross.

function drawFlag(ctx)
{
  ctx.fillStyle = 'red';
  ctx.fillRect(0,0,100,100);
}
function drawFlag(ctx)
{
  ctx.fillStyle = 'red';
  ctx.fillRect(0,0,100,100);
  ctx.fillStyle = 'white';
  ctx.fillRect(10,40,80,20);
  ctx.fillRect(40,10,20,80);
}

United Arab Emirates

  • The flag of United Arab Emirates has a red bar taking one quarter of the rectangle.
  • The rectangle is 200 by 99.

function drawFlag(ctx)
{
  ctx.fillStyle = 'white';
  ctx.fillRect(50,0,150,33);
  ctx.fillStyle = 'red';
}
function drawFlag(ctx)
{
  ctx.fillStyle = 'red';
  ctx.fillRect(0,0,50,99);
  ctx.fillStyle = 'black';
  ctx.fillRect(50,0,150,33);
  ctx.fillStyle = 'white';
  ctx.fillRect(50,33,150,33);
  ctx.fillStyle = 'green';
  ctx.fillRect(50,66,150,33);
}
Served by: dill at 2025-09-09T19:51

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