Edit in JSFiddle

<script type="text/paperscript" canvas="myCanvas">
    var path = new Path({
        segments:[[40,115],[80,180],[200,20]],
        selected:true
    });
    path.fillColor = "#5CCCCC";
    
    //stroke width
    var path2 = path.clone();
    path2.position.x += 150;
    path2.fillColor = null;
    path2.strokeColor = "#5CCCCC";
    path2.strokeWidth = 10;
    
    path2.strokeCap = "round";
    path2.strokeJoin = "round";
    
    //dash
    var path3 = path2.clone();
    path3.position.x -= 150;
    path3.position.y += 200;
    
    path3.dashArray = [5,30];
    
    //style
    project.currentStyle = {
        strokeColor:"#555",
        fillColor:"#FF9640",
        strokeWidth:3
    };
    
    var firstPath = new Path.Circle({
        center:[300,300],
        radius:50
    });
    
    project.currentStyle.strokeWidth = 10;
    project.currentStyle.fillColor = "#67E667";
    
    var secondPath = new Path.Circle({
        center:[450,300],
        radius:50
    });
</script>

<canvas id="myCanvas" resize></canvas>