I'm drawing a canvas programmatically, given a bunch of path data from somewhere else and adding it to the canvas as
// This is actually done more elaborately, but will do for now
PathFigureCollection figures = GetPathFigureCollection();
var path = new Path
{
Data = new PathGeometry { Figures = figures },
Fill = GetFill(),
Stroke = GetStroke(),
StrokeThickness = GetThickness()
};
MyCanvas.Children.Add(path);
Now, I have the canvas in a ScrollViewer, so I want to make sure that I can scroll all the way to reveal the entire path (actually paths - I have several, generated the same way) but no further. I tried this:
var drawingWidth = MyCanvas.Children
.OfType<FrameworkElement>()
.Max(e => Canvas.GetLeft(e) + e.ActualWidth);
MyCanvas.Width = drawingWidth;
This works well for some other elements (the drawing also has a few text blocks and ellipses), but for the paths both Canvas.GetLeft(e) and e.ActualWith (as well as some other things I tried like e.RenderSize.Width and e.DesiredSize.With) all return 0. Since the element that extends farthest to the right is a path, this results in a canvas that is too small.
How do I get the width of the Path elements too?
Ha, found it!
Rewriting the LINQ query as a loop, I could cast paths to Path, and use path.Data.Bounds.Right as the right edge of that element.** I might be able to convert the code back to a LINQ query now that I know what I want to do (I always find them more readable than stateful loops...).
I found this when I, after having perused the link provided by markE where, as a side note, it was stated that
If your design requirements allow more rough approximates, then you will find that cubic Bezier curves are always contained within their control points.
So, if I could find the right-most control point of all the path figures in my path, I would be home. Intellisense did the rest of the job for me :)
Related
I have a chart with a legend whose symbol I replaced per the example in the docs. It looks like this:
var marker = chart.legend.markers.template;
marker.disposeChildren();
let dollar = marker.createChild(am4core.Image);
dollar.width = 40;
dollar.height = 40;
dollar.verticalCenter = "top";
dollar.horizontalCenter = "left";
dollar.strokeWidth = 2;
dollar.strokeOpacity = 1;
dollar.adapter.add("href", function (href: any, target: any) {
return `http://host.com?id=${target.dataItem.dataContext.dummyData.value`;
});
And this works, my images are displayed, little faces :) - I would like to add a border around the image of the same color of the series so that you can identify the marker in the legend with the series. But I can't find the right set of settings to make this a thing.
Is this possible?
EDIT -
So, I tried the following chage to the above and got a decent result. It's a bit hacky, so there might be a better way. If not, I guess this works.
//marker.disposeChildren(); <= don't do this
marker.width = "50px";
marker.height = "50px";
Basically the original marker remains and is behind the image. The marker has to be made larger so that it sticks out and creates a pseudo border.
I'm going to answer this one myself, since I have a working solution and no one lese answered :)
The edit above does what it is needed. Doesn't see like a great solution, a border around an image should be doable. But this gets us what we want.
Solution:
Make the marker bigger than the image
Place the image above the marker
In this case, we do not remove child elements of the marker, like the sample code on amchart4 shows, since you need it.
I'm using Builder v1.80.06
I can vary the position of a polygon every repeat easily enough
e.g. I have a Positions list
positions=[[1,1],[1.1,0.9],...]
and in the 'Position field' have :
$positions[0]
and then change it's value in a code block on each repeat.
BUT I want to vary the size in a similar manner with a $sizes list but get an error.
Looking at the generated code, the problem is at the object creation stage. the code generated is:
for a hard coded polygon (ie ok)
polygon_1 = visual.Rect(win=win, name='polygon_1',
width=[1.5, .2][0], height=[1.5, .2][1],
ori=0, pos=[0, -0.6],
lineWidth=1, lineColor=[1,1,1], lineColorSpace=u'rgb',
fillColor=[0,1,0], fillColorSpace=u'rgb',
opacity=1,interpolate=True)
for one populated by a variable (not working):
polygon_2= visual.Rect(win=win, name='polygon_2',
width=1.0[0], height=1.0[1],
ori=0, pos=[0,0],
lineWidth=1, lineColor=[1,1,1], lineColorSpace=u'rgb',
fillColor=[1,0,0], fillColorSpace=u'rgb',
opacity=1,interpolate=True)
It complains (rightly) that 1.0[0] makes no sense on the width and height parameters
Even though I have my sizes list instantiated in a code block right at the beginning of the experiment instead of reading $sizes[0] a default float value of 1.0 is used.
Any other suggestions for how to vary the polygon size dynamically at runtime using builder?
I could just take the generated code and drop it into coder I suppose and fix the problem but I want to hand this over to a researcher so would like for them to be able to maintain it.
thanks,
If you set size to be a tuple/list with a pair values [1.2,1.5] or [1,1] does that not fix it?
When you change attributes at runtime, just change the attribute of an existing stimulus instead of instantiating a full new stimulus. The latter is quite heavy on ressources, causing unreliable timing. So do
stim = visual.Rect(win) # instantiation, ressource heavy
stim.attribute = newValue # change attribute. lighter.
I can think of two ways you could do it in a pretty neat way. The first is to set width and height explicitly instead of the size attribute, but using a size-like value. So (removing all parameters not of interest):
polygon_2 = visual.Rect(win)
# Unpack the x,y-sizes to the stimulus .width and .height attributes
newSize = (1.5, 0.2)
polygon_2.width, polygon_2.height = newSize
The second, if the size attribute is really important to use, is to use the Polygin with edges=4 to make it a rectangle:
polygon_2 = visual.Polygon(win=win, edges=4, size=(1.5, 0.2))
# Setting size
polygon_2.size = (0.8, 0.4)
Do try Jon's suggestion first. But the idea with visual.Rect and visual.Circleis to use substitute Polygon's size and vertices for something more relevant. So size can do unexpected things if width/height etc. are not 1.
I have a circle-shaped dynamic body and I need to resize it during the game (It appears like a point, then it grows to a circle and after that it starts moving). How should I do that?
I have an idea - it's to use some animation (Circle has the same radius, but due to animation it looks like the circle grows), but I'm not sure if it's right way or not. (Besides I don't know how to realize it)
For scaling circle, if you are using sprite just scale it sprite.setScale(float), if your sprite is attached to Box2d Circle-shape then get the Body's shape and set the radius
Shape shape = body.getFixture().getShape;
shape.setRadius(radiusValue);
and if you are using ShapeRenderer just multiply the points of ShapeRenderer.
I assume that you are talking about a Box2D body.
It is not possible to change a circle-shaped fixture with Box2D. Box2D is a rigid body simulator. What you would have to do is destroy the fixture and replace it with a smaller/bigger version of the circle. But this will cause a lot of problems, since you cannot destroy a fixture when there is still a contact for example.
It would be better to keep the circle the same size and just simulate a change in size with an animation of a texture on top.
If you cannot simulate that, then maybe try the following approach: Have several versions of that circle in different sizes and keep them on top of each other. Implement a ContactFilter which will only cause contacts for the one circle which is currently "active".
Inside any Object class with box2d, I use the following for dynamic resizing:
public void resize(float newradius) {
this.body.destroyFixture(this.fixture);
fixtureDef.density = (float) (this.mass/(Math.PI*newradius*newradius));
this.radius = newradius;
CircleShape circle = new CircleShape();
circle.setRadius(newradius);
this.fixtureDef.shape = circle;
circle.dispose();
this.fixture = body.createFixture(fixtureDef);
this.fixture.setUserData(this);
}
You can also see the following topic: How to change size after it has been created
This question relates to a previous question I have asked.
I have a series of 48 textures on flat square meshes that I am rendering and they all combine to form one "scene." They each have a large percentage of of transparency with one or two smaller images, and when they are line up, I should be able to see the full scene. I expected this would work without much issue, but when when I went to test it, I see the top-most texture, and then anywhere it would have transparency, it is just the clear color.
At first, I thought it was an issue with how I was loading the image and somehow was disabling the alpha, but after playing around with the clear color, I realized that there was some transparency.
Second, I tried was to enable blending - this works if all the textures get combined on a single z plane.
I have posted my image loading and blending code on the question I linked to above.
Now I am starting to think it may be an issue with the depth buffer, so I added the following code to my window dependent resources:
Microsoft::WRL::ComPtr<ID3D11DepthStencilState> DepthDefault;
D3D11_DEPTH_STENCIL_DESC depthstencilDesc;
ZeroMemory(&depthstencilDesc, sizeof(depthstencilDesc));
depthstencilDesc.DepthEnable = FALSE;
depthstencilDesc.DepthWriteMask = D3D11_DEPTH_WRITE_MASK_ALL;
depthstencilDesc.DepthFunc = D3D11_COMPARISON_ALWAYS;
depthstencilDesc.StencilEnable = FALSE;
depthstencilDesc.BackFace.StencilDepthFailOp = D3D11_STENCIL_OP_KEEP;
depthstencilDesc.BackFace.StencilFailOp = D3D11_STENCIL_OP_KEEP;
depthstencilDesc.BackFace.StencilFunc = D3D11_COMPARISON_ALWAYS;
depthstencilDesc.BackFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
depthstencilDesc.FrontFace.StencilDepthFailOp = D3D11_STENCIL_OP_KEEP;
depthstencilDesc.FrontFace.StencilFailOp = D3D11_STENCIL_OP_KEEP;
depthstencilDesc.FrontFace.StencilFunc = D3D11_COMPARISON_ALWAYS;
depthstencilDesc.FrontFace.StencilPassOp = D3D11_STENCIL_OP_KEEP;
DX::ThrowIfFailed( direct3d.device->CreateDepthStencilState(&depthstencilDesc, DepthDefault.GetAddressOf() ) );
direct3d.context->OMSetDepthStencilState(DepthDefault.Get(), 0);
Even with this code, I am only seeing the topmost layer. Am I missing something, or am I setting something incorrectly?
Edit: To visualize the problem, it's as if I had 48 panes of glass that are all the same size and they are all in a row. Each piece of glass has one image somewhere on it. When you look through all the glass panes, you get one extra awesome image of all the smaller images combined. For me, directx or the pixel shader is only drawing the first glass pane and filling all the transparency of the first pane with the clear/background color.
Edit: The code I'm using to create the depthstencilview:
CD3D11_TEXTURE2D_DESC depthStencilDesc( DXGI_FORMAT_D24_UNORM_S8_UINT, backBufferDesc.Width, backBufferDesc.Height, 1, 1, D3D11_BIND_DEPTH_STENCIL );
ComPtr<ID3D11Texture2D> depthStencil;
DX::ThrowIfFailed( direct3d.device->CreateTexture2D( &depthStencilDesc, nullptr, &depthStencil ) );
auto viewDesc = CD3D11_DEPTH_STENCIL_VIEW_DESC(D3D11_DSV_DIMENSION_TEXTURE2D);
DX::ThrowIfFailed( direct3d.device->CreateDepthStencilView( depthStencil.Get(), &viewDesc, &direct3d.depthStencil ) );
That code is literally right above my depth test/ D3D11_DEPTH_STENCIL_DESC code. I'm presuming that this creates the depth code.
I think you might need to sort the order in which you render your vertices if you want to render semi-transparencies with a depth buffer. If you don't want to use a depth buffer - perhaps just don't define/create/set it?
I have a Zedgraph textobj which I want to place always in the same x, y position (ASP.NET image). I noticed that the text doesn't always show in the same starting x position. It shifts depending on the text's length. I tried to have the text to have the same length by padding it with spaces. It helped a little but the result is not always consistent. I am using PaneFraction for coordType.
What's the proper method to have a piece of text to always show in the same x position. I am using textobj as a title because the native title property always shows up centered and I need my title be left aligned to the graph.
No, it does not depend on text lenght, however...
It depends on various other things:
Horizontal and vertical align of the text box (see: Location )
Current size of the pane. The font size is scaled dynamically to fit the changing size of the chart.
Counting proper positions to have TextObj (or any other object) always at the same place is quite hard. So you need avoid as much as you can any numbers/fractions in your location coordinates. ZedGraph sometimes calculates the true position in quite odd way then.
You haven't provided any code, so it's hard to tell if and where you made the mistake (if any). But, if I were you, I would do something like that:
TextObj fakeTitle = new TextObj("some title\n ", 0.0, 0.0); // I'm using \n to have additional line - this would give me some space, margin.
fakeTitle.Location.CoordinateFrame = CoordType.ChartFraction;
fakeTitle.Location.AlignH = AlignH.Left; // Left align - that's what you need
fakeTitle.Location.AlignV = AlignV.Bottom; // Bottom - it means, that left bottom corner of your object would be located at the left top corner of the chart (point (0,0))
fakeTitle.FontSpec.Border.IsVisible = false; // Disable the border
fakeTitle.FontSpec.Fill.IsVisible = false; // ... and the fill. You don't need it.
zg1.MasterPane[0].GraphObjList.Add(fakeTitle);
I'm using ChartFraction coordinates instead of PaneFraction (as drharris suggests) coordinates to have the title nicely aligned with the left border of the chart. Otherwise it would be flushed totally to the left side (no margin etc...) - it looks better this way.
But make sure you didn't set too big font size - it could be clipped at the top
Are you using this constructor?
TextObj(text, x, y, coordType, alignH, alignV)
If not, then be sure you're setting alignH to AlignH.Left and alignV to AlignV.Top. Then X and Y should be 0, 0. PaneFraction for the coordType should be the correct option here, unless I'm missing your intent.
Alternatively, you can simply download Zedgraph code, edit it to Left-align the title (or even better, provide an option for this, which should have been done originally), and then use it in production. Beauty of open source.