Drawing a Rotated Rectangle

Question

I realize this might be more of a math problem.

To draw the lines for my rectangles I need to solve for their corners. I have a rectangle center at (x,y) With a def

Answer 1

use this....I got succeded...

 ctx.moveTo(defaults.x1, defaults.y1);

    // Rotation formula
    var x2 = (defaults.x1) + defaults.lineWidth * Math.cos(defaults.rotation * (Math.PI / 180));
    var y2 = (defaults.y1) + defaults.lineWidth * Math.sin(defaults.rotation * (Math.PI / 180));

    ctx.lineTo(x2, y2);

    x2 = (x2) + defaults.lineHeight * Math.cos((defaults.rotation + 90) * (Math.PI / 180));
    y2 = (y2) + defaults.lineHeight * Math.sin((defaults.rotation + 90) * (Math.PI / 180));
    ctx.lineTo(x2, y2);

    x2 = (x2) + defaults.lineWidth * Math.cos((defaults.rotation + 180) * (Math.PI / 180));
    y2 = (y2) + defaults.lineWidth * Math.sin((defaults.rotation + 180) * (Math.PI / 180));
    ctx.lineTo(x2, y2);

    x2 = (x2) + defaults.lineHeight * Math.cos((defaults.rotation + 270) * (Math.PI / 180));
    y2 = (y2) + defaults.lineHeight * Math.sin((defaults.rotation + 270) * (Math.PI / 180));