Javascript 如何在d3.zoom(d3v4/v5)中捕捉收缩和拉伸手势事件 背景
我正在d3v5可视化中构建多个交互。单击并拖动应该允许用户平移svg容器。滚轮应垂直平移。这两种方法都有效Javascript 如何在d3.zoom(d3v4/v5)中捕捉收缩和拉伸手势事件 背景,javascript,d3.js,Javascript,D3.js,我正在d3v5可视化中构建多个交互。单击并拖动应该允许用户平移svg容器。滚轮应垂直平移。这两种方法都有效 svg.call(d3.zoom().on("zoom", zoomed)).on("wheel.zoom", wheeled); function zoomed() { current_transform = d3.zoomTransform(g); current_transform.x += d3.event.sourceEvent.movementX; c
svg.call(d3.zoom().on("zoom", zoomed)).on("wheel.zoom", wheeled);
function zoomed() {
current_transform = d3.zoomTransform(g);
current_transform.x += d3.event.sourceEvent.movementX;
current_transform.y += d3.event.sourceEvent.movementY;
g.attr("transform", current_transform);
}
function wheeled() {
current_transform = d3.zoomTransform(g);
current_transform.y = current_transform.y - d3.event.deltaY;
g.attr("transform", current_transform);
}
问题:
我希望允许用户使用收缩和拉伸触摸手势来缩放经典意义上的svg。“wheel.zoom”
对触摸手势的模拟是什么?如何在用户的触控板或手机上挤压和拉伸时注册回调
笔记
- 大概是吧。但是 当我掐和伸的时候,不要用圆木
- 我见过
似乎在挤压和拉伸时,“wheel.zoom”和
d3.event.type==“wheel”
捕捉到了挤压手势。此外,对于所有这些事件,d3.event.deltaZ==0
结果是,当d3.event.ctrlKey
设置为True时,wheel.zoom
会发出触控板挤压。这是浏览器同意的:
很不直观,但你已经知道了
这是我的最终代码:
svg.call(d3.zoom().on("zoom", zoomed)).on("wheel.zoom", wheeled);
transform = d3.zoomTransform(g);
transform.x += margin.left;
transform.y += margin.top;
g.attr("transform", transform);
function zoomed() {
current_transform = d3.zoomTransform(g);
current_transform.x += d3.event.sourceEvent.movementX;
current_transform.y += d3.event.sourceEvent.movementY;
g.attr("transform", current_transform);
}
function wheeled() {
current_transform = d3.zoomTransform(g);
if (d3.event.ctrlKey) {
current_transform.k = current_transform.k - d3.event.deltaY * 0.01;
} else {
current_transform.y = current_transform.y - d3.event.deltaY;
}
g.attr("transform", current_transform);
}
svg.call(d3.zoom().on("zoom", zoomed)).on("wheel.zoom", wheeled);
transform = d3.zoomTransform(g);
transform.x += margin.left;
transform.y += margin.top;
g.attr("transform", transform);
function zoomed() {
current_transform = d3.zoomTransform(g);
current_transform.x += d3.event.sourceEvent.movementX;
current_transform.y += d3.event.sourceEvent.movementY;
g.attr("transform", current_transform);
}
function wheeled() {
current_transform = d3.zoomTransform(g);
if (d3.event.ctrlKey) {
current_transform.k = current_transform.k - d3.event.deltaY * 0.01;
} else {
current_transform.y = current_transform.y - d3.event.deltaY;
}
g.attr("transform", current_transform);
}