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DrawFigures.js
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DrawFigures.js
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// Rohan Skariah
// Tangia Sun
// Ryan Teoh
// Justin Wong
//We are using canvas to draw the shapes
var canvas = document.querySelector('canvas');
//Set the canvas dimensions
canvas.width = Math.ceil(window.innerWidth / 2 / 100) * 100;
canvas.height = Math.ceil(window.innerHeight / 2 / 100) * 100;
var c = canvas.getContext('2d');
//Scaling for the objects
var gridFactor = 10;
//Allows the users to change the scaling of the graph where the shapes appear.
function changeGridFactor(newGridFactor)
{
c.clearRect(0, 0, canvas.width, canvas.height);
gridFactor = newGridFactor;
drawGrid();
}
// The function draws the grid in order to gain perspective for the shapes
function drawGrid()
{
// Grid
var xGrid = 0;
var yGrid = 0;
c.globalAlpha = 0.2;
// Vertical lines
for (var i = 0; i < canvas.width / gridFactor; i++)
{
c.beginPath();
c.moveTo(xGrid, 0);
c.lineTo(xGrid, canvas.height);
c.strokeStyle = "black";
c.stroke();
xGrid += gridFactor * 5;
}
// Horizontal lines
for (var j = 0; j < canvas.height / gridFactor; j++)
{
c.beginPath();
c.moveTo(0, yGrid);
c.lineTo(canvas.width, yGrid);
c.strokeStyle = "black";
c.stroke();
yGrid += gridFactor * 5;
}
c.globalAlpha = 1;;
c.strokeStyle = "black";
c.strokeRect(0, 0, canvas.width, canvas.height);
}
// Clears the canvas
function clearCanvas()
{
c.clearRect(0, 0, canvas.width, canvas.height);
}
//Draw the circle with the input from the user
function drawCircle(radius)
{
var xPos = parseInt(canvas.width) / 2 / gridFactor;
var yPos = parseInt(canvas.height) / 2 / gridFactor;
radius = parseInt(radius);
if ((xPos + radius)> (canvas.width / gridFactor) || (yPos + radius)> (canvas.height / gridFactor))
{
alert("Not a valid input for this size window");
}
else if (radius > 0)
{
c.clearRect(0, 0, canvas.width, canvas.height);
drawGrid();
c.fillText("Radius = " + radius, gridFactor * (radius + xPos) + 10, yPos * gridFactor);
c.beginPath();
c.arc(xPos * gridFactor, yPos * gridFactor, radius * gridFactor, 0, 2* Math.PI , true);
c.stroke();
}
else
alert("Values must be non-negative, duh");
}
// Draws the rectangle shape
function drawRect(width, height)
{
if (width < 0 || height < 0)
{
alert("Values must be non-negative, duh");
}
else if (width > canvas.width / gridFactor || height > canvas.height / gridFactor)
{
alert("Not a valid input for this size window");
}
else{
var width = parseInt(width) * gridFactor;
var height = parseInt(height) * gridFactor;
var xPos = parseInt(canvas.width) / 2 ;
var yPos = parseInt(canvas.height) / 2 ;
c.clearRect(0, 0, canvas.width, canvas.height);
drawGrid();
c.strokeStyle = "black";
c.strokeRect(xPos - (width / 2), yPos - (height / 2), width, height);
}
}
// Draws the triangle
function drawTriangle(side1, side2, angle, equal)
{
var side1 = parseInt(side1) * gridFactor;
var side2 = parseInt(side2) * gridFactor;
var side3;
var angle = (parseInt(angle) % 360) * Math.PI / 180;
var xPos1, xPos2, xPos3, yPos1, yPos2, yPos3;
xPos1 = 0;
yPos1 = 0;
xPos2 = side1;
yPos2 = 0;
xPos3 = Math.round(side2 * Math.cos(angle));
yPos3 = Math.round(side2 * Math.sin(angle));
yPos3 = 2 * yPos1 - yPos3;
var xAve = (xPos1 + xPos2 + xPos3) / 3;
var yAve = (yPos1 + yPos2 + yPos3) / -3;
var xOffset = (canvas.width / 2) - xAve;
var yOffset = (canvas.height / 2) + yAve;
xPos1 += xOffset;
xPos2 += xOffset;
xPos3 += xOffset;
yPos1 += yOffset;
yPos2 += yOffset;
yPos3 += yOffset;
if (xPos1 < 0 || xPos2 < 0 || xPos3 < 0 || xPos1 > canvas.width || xPos2 > canvas.width || xPos3 > canvas.width ||
yPos1 < 0 || yPos2 < 0 || yPos3 < 0 || yPos1 > canvas.height || yPos2 > canvas.height || yPos3 > canvas.height)
{
alert("Not a valid input for this size window");
}
else{
c.clearRect(0, 0, canvas.width, canvas.height);
drawGrid();
c.beginPath();
c.moveTo(xPos1, yPos1);
c.lineTo(xPos2, yPos2);
c.lineTo(xPos3, yPos3);
c.lineTo(xPos1, yPos1);
c.strokeStyle = "black";
c.stroke();
if (equal)
{
c.beginPath();
c.arc(xPos1, yPos1, (xPos2 - xPos1) / 10, 2*Math.PI - angle, 0 , false);
c.stroke();
c.beginPath();
c.arc(xPos2, yPos2, (xPos2 - xPos1) / 10, Math.PI + angle, Math.PI , true);
c.stroke();
c.beginPath();
c.arc(xPos3, yPos3, (xPos2 - xPos1) / 10, Math.PI - angle, Math.PI - angle * 2, true);
c.stroke();
}
else
{
c.beginPath();
c.arc(xPos1, yPos1, (xPos2 - xPos1) / 10, 2*Math.PI - angle, 0 , false);
c.stroke();
}
}
}
// Draws the ellipse
function drawEllipse(majorRadius, minorRadius)
{
if ((majorRadius * gridFactor > canvas.height) || (majorRadius * gridFactor > canvas.width) ||
(minorRadius * gridFactor > canvas.height) || (minorRadius * gridFactor > canvas.width))
{
alert("Not a valid input for this size window");
}
else {
c.clearRect(0, 0, canvas.width, canvas.height);
drawGrid();
c.beginPath();
c.ellipse(canvas.width / 2, canvas.height / 2, majorRadius * gridFactor, minorRadius * gridFactor, 0, 0, 2 * Math.PI, false);
c.stroke();
}
}
console.log(canvas);