我正在使用鼠標繪製一個框,我正在使用raycast來獲取場景中鼠標的位置。所以,當mouseDown事件觸發時,我以起始點爲起點,在mouseMove發生的同時,我以終點爲結束點,然後在兩點之間繪製一個框。 我在一個空白頁面開始試圖繪圖,當一切都很好時,我將繪圖代碼移到了包含許多組件的主頁面,當然還有一個繪圖畫布的容器。 將我的代碼移動到主頁面後,鼠標位置出現問題。該框位置被移動了x和y上的畫布容器的距離。更改鼠標位置
下圖說明了問題:
紅色標記顯示在我按下鼠標開始繪製盒和藍色的表示我停止了鼠標,這裏的shiffting是Y軸,因爲我在頁面頂部有兩行組件。
這是一個簡化代碼:
<body>
<div>
<button class="btn btn-info" onclick="rotate_x()"><b>X</b></button>
<button class="btn btn-info" onclick="rotate_y()"><b>Y</b></button>
<button class="btn btn-info" onclick="rotate_z()"><b>Z</b></button>
<button class="btn btn-info" onclick="reset_rotation()"><b>Reset</b></button>
<input type="checkbox" name="selection" onchange="selection_mode_change()" checked><b>Selection mode</b>
</div>
<div>
<button class="btn btn-info" onclick="rotate_x()"><b>X</b></button>
<button class="btn btn-info" onclick="rotate_y()"><b>Y</b></button>
<button class="btn btn-info" onclick="rotate_z()"><b>Z</b></button>
<button class="btn btn-info" onclick="reset_rotation()"><b>Reset</b></button>
<input type="checkbox" name="selection" onchange="selection_mode_change()" checked><b>Selection mode</b>
</div>
<script>
var container;
var camera, scene, renderer, dirLight;
var raycaster;
var mouse;
var is_mouse_down = false;
var area;
var start, end;
var objects = [];
init();
animate();
function init() {
container = document.createElement('div');
document.body.appendChild(container);
camera = new THREE.PerspectiveCamera(70, window.innerWidth/window.innerHeight, 1, 1000000);
camera.position.set(0, 0, 1000);
scene = new THREE.Scene();
// Box
var area_geometry = new THREE.BoxGeometry(1, 1, 1);
area = new THREE.Mesh(area_geometry, new THREE.MeshBasicMaterial({
color: 0x00ff00,
opacity: 0.2,
visible: true
}));
area.position.x = 0;
area.position.y = 0;
area.position.z = 0;
area.scale.x = 1;
area.scale.y = 1;
area.scale.z = 1;
scene.add(area);
// plane for the raycast intersection
var geometry = new THREE.BoxGeometry(100, 100, 100);
var object = new THREE.Mesh(geometry, new THREE.MeshBasicMaterial({
color: Math.random() * 0xffffff,
opacity: 0.1,
visible: false
}));
object.position.x = 0;
object.position.y = 0;
object.position.z = -1000;
object.scale.x = 100;
object.scale.y = 100;
object.scale.z = 1;
scene.add(object);
objects.push(object);
raycaster = new THREE.Raycaster();
mouse = new THREE.Vector2();
// Light
dirLight = new THREE.DirectionalLight(0xffffff, 1);
dirLight.position.set(camera.position.x, camera.position.y, camera.position.z);
scene.add(dirLight);
renderer = new THREE.CanvasRenderer();
renderer.setClearColor(0xffffff);
renderer.setPixelRatio(window.devicePixelRatio);
renderer.setSize(window.innerWidth, window.innerHeight);
container.appendChild(renderer.domElement);
document.addEventListener('mousedown', onDocumentMouseDown, false);
document.addEventListener('mouseup', onDocumentMouseUp, false);
document.addEventListener('mousemove', onDocumentMouseMove, false);
document.addEventListener('touchstart', onDocumentTouchStart, false);
window.addEventListener('resize', onWindowResize, false);
}
function onWindowResize() {
camera.aspect = window.innerWidth/window.innerHeight;
camera.updateProjectionMatrix();
renderer.setSize(window.innerWidth, window.innerHeight);
}
function onDocumentTouchStart(event) {
event.preventDefault();
event.clientX = event.touches[0].clientX;
event.clientY = event.touches[0].clientY;
onDocumentMouseDown(event);
}
function onDocumentMouseDown(event) {
event.preventDefault();
start = get_intersection_point(event);
is_mouse_down = true;
}
function onDocumentMouseUp(event) {
event.preventDefault();
is_mouse_down = false;
}
function onDocumentMouseMove(event) {
if (is_mouse_down) {
end = intersection(event);
update_selection_area_view(start, end);
}
}
function animate() {
requestAnimationFrame(animate);
render();
}
function render() {
camera.lookAt(scene.position);
renderer.render(scene, camera);
}
function get_intersection_point(event) {
mouse.x = (event.clientX/renderer.domElement.clientWidth) * 2 - 1;
mouse.y = -(event.clientY/renderer.domElement.clientHeight) * 2 + 1;
raycaster.setFromCamera(mouse, camera);
var intersects = raycaster.intersectObjects(objects);
if (intersects.length > 0) {
return intersects[0].point;
}
return null;
}
function update_selection_area_view(start, end) {
width = Math.abs(start.x - end.x);
height = Math.abs(start.y - end.y);
center = new THREE.Vector3(-(start.x + end.x)/2, -(start.y + end.y)/2, (start.z + end.z)/2);
area.position.x = center.x;
area.position.y = center.y;
area.position.z = center.z;
area.scale.x = width;
area.scale.y = height;
area.scale.z = 1;
}
</script>
</body>
我不知道爲什麼發生這種情況,如何解決這個問題。
謝謝
謝謝,我知道問題的原因,我不知道如何表達我的需要。 我在這裏找到了解決方案:https://stackoverflow.com/questions/29518886/moved-coordinat es-of-the-scene-when-dom-element-with-renderer-is-the-top 其中容器的頂部是:container.getBoundingClientRect()。top Thanks^_ ^ –