Flags with Rectangles: Difference between revisions
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<pre id='shellbody' | <pre id='shellbody' data-qtp='canvas'></pre> | ||
You can dive right in and start programming - or you can watch this worked example: [[Worked example Benin|Flag of Benin]] | |||
*You will need to use the method [https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/fillRect fillRect] | |||
*You will need to use the property [https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/fillStyle fillStyle] | |||
==Libya== | ==Libya== | ||
<div class='qu' data-width="150" data-height="100"> | <div class='qu' data-width="150" data-height="100"> | ||
The flag of Libya, until 2011, was a simple green rectangle. | 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. | Try the program as it is given, then change it so that the green rectangle is 150 wide. | ||
[[Image:flaglibya.png|border]] | [[Image:flaglibya.png|border]] | ||
<pre class='usr'> | <pre class='usr'> | ||
| Line 47: | Line 27: | ||
==France== | ==France== | ||
<div class=qu | <div class=qu data-width="150" data-height="100"> | ||
The flag of France is blue, white and red. | 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/> | The code given draws only one of the three rectangles required and it is in the wrong place.<br/> | ||
| Line 72: | Line 52: | ||
==Germany== | ==Germany== | ||
<div class=qu | <div class=qu data-width=150 data-height=90> | ||
The flag of Germany is black, red and yellow. | The flag of Germany is black, red and yellow. | ||
| Line 98: | Line 78: | ||
==Switzerland== | ==Switzerland== | ||
<div class=qu | <div class=qu width='100' height='100' | ||
className="Raster" level='1'> | className="Raster" level='1'> | ||
The flag of Switzerland is red with a white cross in the center. | The flag of Switzerland is red with a white cross in the center. | ||
| Line 121: | Line 101: | ||
==United Arab Emirates== | ==United Arab Emirates== | ||
<div class=qu | <div class=qu data-width='200' data-height='99'> | ||
*The flag of United Arab Emirates has a red bar taking one quarter of the rectangle. | *The flag of United Arab Emirates has a red bar taking one quarter of the rectangle. | ||
*The rectangle is 200 by 99. | *The rectangle is 200 by 99. | ||
Latest revision as of 21:33, 28 August 2023
You can dive right in and start programming - or you can watch this worked example: Flag of Benin
1) 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.
Input
xxxxxxxxxxfunction drawFlag(ctx){ ctx.fillStyle = 'green'; ctx.fillRect(0,0,75,100);} Output
function drawFlag(ctx)
{
ctx.fillStyle = 'green';
ctx.fillRect(0,0,75,100);
}
function drawFlag(ctx)
{
ctx.fillStyle = 'green';
ctx.fillRect(0,0,150,100);
}
2) 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.
Input
xxxxxxxxxxfunction drawFlag(ctx){ ctx.fillStyle = 'blue'; ctx.fillRect(50,0,50,100);}Output
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);
}
3) 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.
Input
xxxxxxxxxxfunction drawFlag(ctx){ ctx.fillStyle = 'yellow'; ctx.fillRect(0,0,150,30);} Output
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);
}
4) 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.
Input
xxxxxxxxxxfunction drawFlag(ctx){ ctx.fillStyle = 'red'; ctx.fillRect(0,0,100,100);}Output
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);
}
5) 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.
Input
xxxxxxxxxxfunction drawFlag(ctx){ ctx.fillStyle = 'white'; ctx.fillRect(50,0,150,33); ctx.fillStyle = 'red';}Output
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);
}