We have a large canvas contained in a scrollviewer. The user can move the canvas by dragging with the mouse, or using the scrollbars.
How can we change the zoom (scale) in the scrollviewer while keeping the current center point?
I think the issue is getting the correct CenterX and CenterY for the ScaleTransform:
var st = MapCanvas.RenderTransform as ScaleTransform;
if (null != st)
{
st.CenterX = point.X;
st.CenterY = point.Y;
st.ScaleX = st.ScaleY = scale;
}
Thanks for any hints...
It's been a while since I looked at transforms, but you might want to try setting the RenderTransformOrigin of MapCanvas to new Point(0.5, 0.5) (or set it in XAML)
Related
I'm developing an app with blazor client-side and I need to render a 3D scene.
I have an issue and I guess it is material-related.
I have a composition of parallelepipeds where one of them is fully opaque and the others are transparent.
Depending on the camera angle, the transparent ones completely disappear:
Example where everything is visible:
Example with 2 missing:
Example with all missing:
Code for transparent parallelepipeds
var geometry = new THREE.CubeGeometry(item.xDimension * _scene.normalizer, item.yDimension * _scene.normalizer, item.zDimension * _scene.normalizer);
var material = new THREE.MeshBasicMaterial();
var box = new THREE.Mesh(geometry, material);
box.material.color = new THREE.Color("gray");
box.material.opacity = 0.8;
box.material.transparent = true;
Code for the camera:
var camera = new THREE.PerspectiveCamera(60, width / height, 0.1, 100);
camera.position.set(1.3, 1.3, 1.3);
camera.lookAt(0, 0, 0);
I'm using OrbitControls and every object size is between 0 an 1 (_scene.normalizer is for that purpose)
Do you know why this is happening?
Edit:
I found it being a material depth function issue. Do you know which should I use?
Thanks,
Transparency is tricky with WebGL because a transparent object writes to the depthmap, and then the renderer assumes that subsequent objects behind it are occluded so it skips drawing them. You could avoid this by playing with the material's .depthTest and .depthWrite attributes (see the docs):
box.material.color = new THREE.Color("gray");
box.material.opacity = 0.8;
box.material.transparent = true;
box.material.depthWrite = false;
In my Cocos2d js android app i have a UI button as
var button=new ccui.Button();
button.loadTextures(res.play_png,res.play_png);
button.setAnchorPoint(cc.p(0,0));
button.x=size.width/2;
button.y=size.height/2;
this.addChild(button);
The button loads and i am able to set it at any position on the screen.
But i am unable to change its width and height to specified number of pixels.
I want something like
button.width=100;
button.height=100;
I did not find any method to do that...
Any help how to accomplish this would be greatful.
Thanks.
The buttons i use are options like play,how to play,share etc..
So i have to position them in such a way that they dont overlap or get distorted for various screen resolutions...
How can i use the setScale method in this context???
We can make a call to a function that can scale the size of the UIButton by performing an action. In this case, the following code might help:
performScaleAction : function()
{
var duration = 0; // duration in seconds for performing this action
var scaleX = 0.5; // scale factor for X-axis
var scaleY = 0.5; // scale factor for Y-axis
var scaleAction = new cc.ScaleTo(duration , scaleX , scaleY );
this.runAction(scaleAction);
}
Now, call the above function in the following way:
this.performScaleAction();
this.addChild(button);
So, if the actual height of the image used for creating the UIButton is h, in this case, the new size as displayed on the screen would be h times scaleX . Same for the width of the UIButton.
Hope this helps!
for (int i = 0; i < length; i++)
{
Image img1 ;
img1 = null;
img1= new Image();
img1.Height = snhei;
img1.Width = snwid;
BitmapImage BitImg = new BitmapImage(new Uri("/Assets/midtail.png", UriKind.Relative));`
img1.VerticalAlignment = VerticalAlignment.Top;
img1.HorizontalAlignment = HorizontalAlignment.Left;
img1.Source = BitImg;
img1.Stretch = Stretch.Fill;
img1.Name = "mid" + i.ToString() ;
img1.Margin = new Thickness(image_width*i, 0, 0, 0);
stackp.Children.Add(img1);
}
after running i get first image at 0,0
then it is render the one image_width below
The problem is your container. The StackPanel will, as it name indicates, try to stack the images. Then you apply the margin, moving the picture farther away.
You have two solutions, depending on what you want:
If you just want the images to be displayed side by side, set the Orientation property of your StackPanel to Horizontal. Then, remove your line of code that sets the margin, since the positioning is automatically handled by the StackPanel
If you still want to position the pictures manually, then you have to use another type of container. Replace your StackPanel by a Canvas or a Grid.
I have a moving camera in camera container which flies arond the scene on giving paths like an airplane; so it can move to any position x,y,z positive and negative. The camera container is looking at his own future path using a spline curve.
Now I want to rotate the camera using the mouse direction but still keeping the general looking at position while moving forward with object. You could say, i want to turn my head on my body: while moving the body having the general looking at direction, i am turning my head around to lets say 220 degree up and down. So i can't look behind my body.
In my code the cameraContainer is responsible to move on a pline curve and to lookAt the moving direction. The camera is added as a child to the cameraContainer responsible for the rotation using the mouse.
What i don't get working properly is the rotation of the camera. I guess its a very common problem. Lets say the camera when moving only on x-axes moves not straight, it moves like a curve. Specially in different camera positions, the rotation seems very different. I was tryiing to use the cameraContainer to avoid this problem, but the problem seems nothing related to the world coordinates.
Here is what i have:
// camera is in a container
cameraContainer = new THREEJS.Object3D();
cameraContainer.add(camera);
camera.lookAt(0,0,1);
cameraContainer.lookAt(nextPositionOnSplineCurve);
// Here goes the rotation depending on mouse
// Vertical
var mouseVerti = 1; // 1 = top, -1 = bottom
if(window.App4D.mouse.y <= instance.domCenterPos.y) // mouse is bottom?
mouseVerti = -1;
// how far is the mouse away from center: 1 most, 0 near
var yMousePerc = Math.abs(Math.ceil((instance.domCenterPos.y - window.App4D.mouse.y) / (instance.domCenterPos.y - instance.domBoundingBox.bottom) * 100) / 100);
var yAngleDiffSide = (instance.config.scene.camera.maxAngle - instance.config.scene.camera.angle) / 2;
var yRotateRan = mouseVerti * yAngleDiffSide * yMousePerc * Math.PI / 180;
instance.camera.rotation.x += yRotateRan; // rotation x = vertical
// Horizontal
var mouseHori = 1; // 1 = top, -1 = bottom
if(window.App4D.mouse.x <= instance.domCenterPos.x) // mouse is left?
mouseHori = -1;
// how far is the mouse away from center: 1 most, 0 near
var xMousePerc = Math.abs(Math.ceil((instance.domCenterPos.x - window.App4D.mouse.x) / (instance.domCenterPos.x - instance.domBoundingBox.right) * 100) / 100);
var xAngleDiffSide = (instance.config.scene.camera.maxAngle - instance.config.scene.camera.angle) / 2;
var xRotateRan = mouseHori * xAngleDiffSide * xMousePerc * Math.PI / 180;
instance.camera.rotation.y += xRotateRan; // rotation y = horizontal
Would be really thankful if someone can give me a hint!
I got the answer after some more trial and error. The solution is to simply take the initial rotation of y in consideration.
When setting up the camera container and the real camera as child of the container, i had to point the camera to the frontface of the camera container object, in order to let the camera looking in the right direction. That lead to the initial rotation of 0, 3.14, 0 (x,y,z). The solution was to added 3.14 to the y rotation everytime i assigned (as mentioned by WestLangley) the mouse rotation.
cameraReal.lookAt(new THREE.Vector3(0,0,1));
cameraReal.rotation.y = xRotateRan + 3.14;
I am doing DoubleAnimation of the Width property of a Canvas. I want to shrink the canvas to 1/5 th of the size.
var widthAnimation = new DoubleAnimation();
widthAnimation.Duration = new TimeSpan(0,0,1);
StoryBoard.SetTarget(widthAnimation, Canvas1);
StoryBoard.SetTargetProperty(widthAnimation, new PropertyPath("Width"));
widthAnimation.From = Canvas1.Width;
widthAnimation.To = Canvas1.Width * .2;
StoryBoard stb = new StoryBoard();
stb.Children.Add(widthAnimation);
stb.Begin();
Somehow, the above animation does not shrink the size to 1/5th. Instead, it enlarges the canvas. Any clues why the animation is doing something funny?
The canvas was wrapped in a viewbox. The Viewbox size was fixed, while the canvas within it shrinked. The text expanded. Not sure why. But, I fixed the problem by applying the animation to the Viewbox rather than the Canvas. And it works all fine now.