小编Gle*_*ker的帖子

我不明白如何在某一点旋转我的对象.这是我的javascript

            // create needle 
            var rsr = Raphael('rsr', '320', '240'); 
            var needle = rsr.path("m 156.74443,870.84631 -2.26177,119.38851 
            4.38851,0 z"); needle.attr({id: 'needle',parent: 'layer1',fill: 
            '#ff6600',stroke: '#000000',"stroke-width": '0.61',"stroke-linecap":
            'butt',"stroke-linejoin": 'miter',"stroke-miterlimit": '4',"stroke- 
            opacity": '1',"stroke-dasharray": 'none'}); 

            needle.rotate(0); 
            needle.transform("t0,-812.36218").data('id', 'needle'); 

            // get needle bounding box 
            var needleBox = needle.getBBox(); 

            // calculate rotation point (bottom middle)
            var x_rotate_point = needleBox.x + (needleBox.width/2); 
            var y_rotate_point = needleBox.y + needleBox.height; 

            // rotate needle
            needle.attr({rotation: 0}).animate({transform:"r45,"+x_rotate_point 
            +","+y_rotate_point}, 6000); 

            // Creates circle at rotation point 
            var circle = rsr.circle(x_rotate_point, y_rotate_point, 10); 
            circle.attr("fill", …