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问题 I've created my own custom preference objects that extend Preference. I've only created them because there are no Preferences for these custom data types. Everything is working, but my custom preferences don't have the same appearance because they are missing the horizontal divider that the system preference objects have. I've looked for the code that is creating the horizontal divider, but I can't find where it is done. The built in divider isn't just a thin bar. There is a bit of a gradient

问题 I want to draw a line in opengl. glBegin(GL_LINES); glVertex2f(.25,0.25); glVertex2f(.75,.75); glEnd(); this code draw line but if i want to draw a line from coordinate(10,10) to coordinate(20,20) what will i do ? what it means (.25,.25) and (.75, .75) ? 回答1: (.25, .25) and (.75,.75) are line's start and end point. To draw a line from (10,10) to (20,20): glBegin(GL_LINES); glVertex2f(10, 10); glVertex2f(20, 20); glEnd(); 回答2: Each point value in glVertex2f is between -1 and 1, bottom left is

问题 I am learning some GUI stuff on Java and I think Im missing something here. I have some components vertically listed using BoxLayout, such as some JButtons one above other. Now I want to separate them drawing a line between them. Do I have to use the Graphics library or is there some Swing way to separate the components with a line? Going straight to the question: How to draw a line to separate components (such as JButtons) and which is the recommended way of doing it? Thanks! 回答1: JSeparator

问题 I have 30 experimental trials that I logged on a DAQ and I read these in to MATLAB using xlsread. I have a plot now where I show all 30 trials on one figure. What I want to do is create a movie where it shows them plotting one by one. Really I have a total of 60 line plots (30 inputs and 30 outputs), so it would be great if I could show the input and output for one, then the next, etc. Right now my code is similar to this: In_1 = xlsread(filename.xls, #1); In_2 = xlsread(filename.xls, #2); ..

问题 Update: Here's an example of the issue - http://jsfiddle.net/Hffks/2/ I'm trying to use D3 to code a line graph and my line is being closed at the end, by which I mean it acts as a closed path where the first and last points are the same. My data comes in the following JSON format: [ entityA : [ { time : 1230000, // time since epoch attribute1 : 123 // numeric value attribute2 : 123 // numeric value }, { time : 1230010, // time since epoch attribute1 : 123 // numeric value attribute2 : 123 //

问题 I am attempting to draw a line in a custom View . Here I've created a simple Path with just a single segment, created a PathShape from that, and finally stuck that into a ShapeDrawable with the intention of using that to draw on the Canvas inside onDraw() . However, this does not work. See my example, here. package com.example.test; import android.content.Context; import android.graphics.Canvas; import android.graphics.Color; import android.graphics.Paint; import android.graphics.Path; import

问题 I'm trying to get the amount of lines in a TextView . I've searched here for a solution, basically every thread has the same answer : contentheight/fontlineheight. I have a TextView with 8 lines, i run this code and i get contsize : 1.944413 NSLog(@"contsize : %f", descLabel.contentSize.height/descLabel.font.lineHeight); What am i doing wrong? 回答1: For iOS7, a version that take care that you can have differents font (and font size) in your UITextView : - (NSUInteger)numberOfLinesInTextView:

问题 I would like to color X-axis intervals of a plot line with different colours between these points: 52660, 106784, 151429, 192098, 233666, 273857, 307933, 343048, 373099, 408960, 441545, 472813, 497822, 518561, 537471, 556747, 571683, 591232, 599519, 616567, 625727, 633745 The intervals represent SNP positions along 22 chromosomes. The problem is that the intervals are unequal (e.g. 52660 - 106784, 106784 - 151429, ... 472813 - 497822, ...). Y-axis values represent ancestry frequencies. X-axis

问题 How can I lock a line(or a part of a line) in a "QTextEdit" control? I can do this: when I move the cursor position at that part of the line, the cursor will be moved automatically to the next first position that not belongs to that part of the line. Maybe you have antoher idea. Thank you! 回答1: I would connect to the QTextEdit::cursorPositionChanged() and handle the movement there. http://qt-project.org/doc/qt-4.8/qtextcursor.html#position http://qt-project.org/doc/qt-4.8/qtextedit.html

问题 there's this problem about line crossings I saw somewhere and was trying to solve. There's a 64x64 grid of 8 bit pixels and it has a bunch of 1 pixel wide vertical and horizontal lines of different colors on it. All parallel lines have at least one space between them. The problem is to find the number of line crossings that each set of colored lines makes (e.g. all green line crossings count towards one sum). And find which set of lines had the fewest amount of crossings. Also, all vertical