Method addNode

index.js:557–588

( tool, x, y, insertIndex = -1 )

    }

    addNode( tool, x, y, insertIndex = -1 ){
        let pt = this.graph.convertScreenToPath( x, y );
        if (this.config.snap) this.graph.snapToGrid( pt );
        const node = { tool, x: pt.x, y: pt.y };
        this.activeNode = node;
        if (insertIndex != -1){
            this.nodes.splice( insertIndex, 0, node );
        }else{
            this.nodes.push( node );
        }
        const prevNode = ( insertIndex == -1 ) ? this.nodes[ this.nodes.length - 2 ] : this.nodes[ insertIndex - 1 ];

        let ptB;

        switch ( tool ){
            case 'quadraticCurveTo':
                pt = Geometry.calcLineMidPoint( prevNode, node );
                node.options = { ctrlA: pt };
                break;
            case 'bezierCurveTo':
                pt = Geometry.calcPointAlongLine( prevNode, node, 0.66 );
                ptB = Geometry.calcPointAlongLine( prevNode, node, 0.33 );
                node.options = { ctrlA: pt, ctrlB: ptB };
                break;
            case 'arc':
                const radius = ( prevNode ) ? Geometry.calcDistanceBetweenTwoPoints( prevNode, node ) : 0.5;
                node.options = { radius, start: 0, end: Math.PI*2, clockwise: false };
                break;
        }

        this.render(true);
    }

    resize(){
        this.canvas.width = window.innerWidth;