Flags with Lines

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Get on with the programming, don't pause to look at this worked example: Road Sign Square

England

The English flag is the cross of St. George. This is a red cross on a white background .

  • The line thickness should be 18.

Flagengland.png

function drawFlag(ctx)
{
  ctx.fillStyle = 'white';
  ctx.fillRect(0,0,150,90);
  ctx.strokeStyle = 'red';
  ctx.lineWidth = 18;
  ctx.moveTo(0,45);
  ctx.lineTo(150,45);
  ctx.stroke();
}
function drawFlag(ctx)
{
  ctx.fillStyle = 'white';
  ctx.fillRect(0,0,150,90);
  ctx.strokeStyle = 'red';
  ctx.lineWidth = 18;
  ctx.moveTo(0,45);
  ctx.lineTo(150,45);
  ctx.moveTo(75,0);
  ctx.lineTo(75,90);
  ctx.stroke();
}

Scotland

The cross of St. Andrew shows diagonal lines on a blue background.

  • Complete the flag by drawing the other diagonal line.
  • The white lines should be slightly thicker - try 18.

Flagscotland.png

function drawFlag(ctx)
{
  ctx.fillStyle = 'white';
  ctx.fillRect(0,0,150,90);
  ctx.strokeStyle = 'red';
  ctx.lineWidth = 18;
  ctx.moveTo(0,0);
  ctx.lineTo(150,90);
  ctx.stroke();
}
function drawFlag(ctx)
{
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,150,90);
  ctx.strokeStyle = 'white';
  ctx.lineWidth = 18;
  ctx.moveTo(0,0);
  ctx.lineTo(150,90);
  ctx.moveTo(0,90);
  ctx.lineTo(150,0);
  ctx.stroke();
}

Botswana

The flag of Botswana has a black stripe on a white stripe on a blue background.

Flagbotswana.png

  • The flag is 150 by 100
  • The white stripe behind the black one has width 30
  • The black stripe has width 20
  • The pale blue has rgb: '#6EB6ED'
function drawFlag(ctx)
{
  ctx.fillStyle = '#6EB6ED';
  ctx.fillRect(0,0,150,100);
}
function drawFlag(ctx)
{
  ctx.fillStyle = '#6EB6ED';
  ctx.fillRect(0,0,150,100);
  ctx.strokeStyle = 'white';
  ctx.lineWidth = 30;
  ctx.moveTo(0,50);
  ctx.lineTo(150,50);
  ctx.stroke();
  ctx.strokeStyle = 'black';
  ctx.lineWidth = 20;
  ctx.moveTo(0,50);
  ctx.lineTo(150,50);
  ctx.stroke();
}

Iceland

Flagiceland.png

  • 125 by 90
  • The white cross is 20 wide
  • The red cross is 10 wide
  • The cross line intersect at (45, 45)
function drawFlag(ctx)
{
}
function drawFlag(ctx)
{
  ctx.fillStyle = 'blue';
  ctx.fillRect(0,0,125,90);
  ctx.strokeStyle = 'white';
  ctx.lineWidth = 20;
  ctx.moveTo(45,0);
  ctx.lineTo(45,90);
  ctx.moveTo(0,45);
  ctx.lineTo(125,45);
  ctx.stroke();
  ctx.strokeStyle = 'red';
  ctx.lineWidth = 10;
  ctx.moveTo(45,0);
  ctx.lineTo(45,90);
  ctx.moveTo(0,45);
  ctx.lineTo(125,45);
  ctx.stroke();
}

Trinidad and Tobago

We can start and end lines outside the confines of the surface.

  • The white line has width 35
  • The black line has width 25

Flagtrinidad.png

function drawFlag(ctx)
{
  ctx.fillStyle = 'red';
  ctx.fillRect(0,0,150,100);
  ctx.lineWidth = 35;
  ctx.strokeStyle = 'white';
  ctx.moveTo(0,-25);
  ctx.lineTo(75,50);
  ctx.stroke();
}
function drawFlag(ctx)
{
  ctx.fillStyle = 'red';
  ctx.fillRect(0,0,150,100);
  ctx.lineWidth = 35;
  ctx.strokeStyle = 'white';
  ctx.moveTo(0,-25);
  ctx.lineTo(150,125);
  ctx.stroke();
  ctx.lineWidth = 25;
  ctx.strokeStyle = 'black';
  ctx.moveTo(0,-25);
  ctx.lineTo(150,125);
  ctx.stroke();
}