Function drawCrossAtPoint

Examples/FilterExample.js:475–486

(x,y)

                         canvasHeight/2 + unitRadius * pole2Imag);
        
        function drawCrossAtPoint(x,y) {
            var crossRadius = 3;
            ctx.lineWidth = 1;
            ctx.beginPath();
            ctx.moveTo(x - crossRadius, y - crossRadius);
            ctx.lineTo(x + crossRadius, y + crossRadius);
            ctx.stroke();
            ctx.beginPath();
            ctx.moveTo(x - crossRadius, y + crossRadius);
            ctx.lineTo(x + crossRadius, y - crossRadius);
            ctx.stroke();
        }
    }
    
};