transformation

问题 I have a problem moving world coordinates to ndc coordinates than calculate something with it and move it back inside the shader. The Code looks like that: vec3 testFunc(vec3 pos, vec3 dir){ //pos and dir are in worldspace, convert to NDC vec4 NDC_dir = MVP * vec4(dir,0); vec4 NDC_pos = MVP * vec4(pos,1); NDC_dir /= NDC_dir.w; NDC_pos /= NDC_pos.w; //... do some caclulations => get newPos in NDC //Transform newPos back to worldspace vec4 WS_newPos = inverse(MVP) * vec4(newPos,1); return WS

问题 I'm playing around with the 2.0.0-SNAPSHOT, and I want to set the page to landscape and also rotate my picture. So I've done page.setRotation(90); There seems to be a bug with using PDFBox and AffineTransform This code doesn't do anything like I'd expect: AffineTransform at = new AffineTransform(w, 0, 0, h, 20, 20); at.translate(0.5, 1); at.rotate(Math.toRadians(90)); Width and Height have to be tiny to keep the image on the page, rotate by itself squishes the image, and translate before

问题 I´m researching how to transform XML from one format to another in a Java project. What alternatives are there and what are their pros and cons? Alternatives I´ve found so far: XSLT/XQuery XML-binding both formats to Java and do the mapping in Java Groovy 回答1: If you're transforming XML to XML, then you'll only make extra work for yourself if you go via a non-XML representation (such as Java objects). Using a high-level declarative language is the way to go, and that means XSLT or XQuery. In

问题 Like the title tells: Is it possible to write a PHP-Function in a XSL-Document and call it afterwards? I have no case, where I wanna do that. Its just a thing it came into my mind while learning XSL. In XSL you can compose something like: <xsl:processing-instruction name="php"> ...some php... </xsl> The PHP code will be run in your rendered page. Is it possible to create e.g. a PHP Function in the processing-instruction and call it later (in the same template)? Pseudo-Sample: <xsl:template>

问题 I am currently working on a step line chart with a zoom and panning functionality. Since the amount of data I need to process is pretty large, i can not afford to recreate the whole path of the step line, every time layoutPlotChildren() is called. So my idea was to create the path element once and just transform it on zoom an pan events. So far everything worked out as planned, but i am having a big problem when I'm trying to scale the path. Since the Path class is inherited from Shape,

问题 I am a beginner in XSLT. Below is source XML which i receive. Request tag constains the FlightId which is being used to filter the Result tag. Source XML: <Response> <Request> <RequestedFlights> <FlightId>2121</FlightId> <FlightId>2584</FlightId> </RequestedFlights> </Request> <Result> <Flights> <Flight> <Segments> <Segment> <Id>1</Id> <FlightNumber>2121</FlightNumber> </Segment> <Segment> <Id>2</Id> <FlightNumber>1121</FlightNumber> </Segment> </Segments> </Flight> <Flight> <Segments>

问题 Considering data like: from sklearn.preprocessing import OneHotEncoder import numpy as np dt = 'object, i4, i4' d = np.array([('aaa', 1, 1), ('bbb', 2, 2)], dtype=dt) I want to exclude the text column using the OHE functionality. Why does the following not work? ohe = OneHotEncoder(categorical_features=np.array([False,True,True], dtype=bool)) ohe.fit(d) ValueError: could not convert string to float: 'bbb' It says in the documentation: categorical_features: “all” or array of indices or mask :

问题 I have a massive python dictionary with over 90,000 entries. For reasons I won't get into, I need to store this dictionary in my database and then at a later point recompile dictionary from the database entries. I am trying to set up a procedure to verify that my storage and recompilation was faithful and that my new dictionary is equivalent to the old one. What is the best methodology for testing this. There are minor differences and I want to figure out what they are. 回答1: The most obvious

问题 The iOS 5 documentation reveals that GLKMatrix4MakeLookAt operates the same as gluLookAt . The definition is provided here: static __inline__ GLKMatrix4 GLKMatrix4MakeLookAt(float eyeX, float eyeY, float eyeZ, float centerX, float centerY, float centerZ, float upX, float upY, float upZ) { GLKVector3 ev = { eyeX, eyeY, eyeZ }; GLKVector3 cv = { centerX, centerY, centerZ }; GLKVector3 uv = { upX, upY, upZ }; GLKVector3 n = GLKVector3Normalize(GLKVector3Add(ev, GLKVector3Negate(cv))); GLKVector3

问题 I'm doing an animated transform in Raphael (and Snap.svg, which does the same). If I apply a rotation to a basic element, it rotates normally as I would expect. However, if I already have a previous transform applied (even if its t0,0 or r0), the element seems to scale down and back up, as though it always has to fit in its previous bounding box or something. Here is an example fiddle var r1 = s.rect(0,0,100,100,20,20).attr({ fill: "red", opacity: "0.8", stroke: "black", strokeWidth: "2" });