line

问题 Given a starting point, a heading, a distance, and a line segment, find the first point along this heading that is the specified distance away from this line segment. I covered two cases, but I haven't been able to cover the last one. First case: heading away from the line. Ignore it even if the starting point is within the specified distance. Second case: It intersects the line. I solved it using trig and triangles. Initially didn't consider the next case. Third case: It is heading towards

问题 I have a script that begins with: sed 's!'$1'!'$2'!g' file.txt > new.txt ; $1 and $2 are variable and a third variable $3 is used later in the script, the script is executed in this format: ./script.sh variable variable2 variable3 The next part of the script adds the third variable to a text file: sed "s!><!> $3 <!4" newer.txt > newest.txt What I want to do now is use the output from "newest.txt" (which is one line and includes characters like /<>"/ as it's in html) and replace a line in

问题 How make ZigZag line, vertical Not horizontal with css I try, but I can't 回答1: Try this you can adjust their size using background-size property. .con{ width:200px; height:200px; background: linear-gradient(45deg, #ECEDDC 25%, transparent 25%) 0 -50px, linear-gradient(135deg, #ECEDDC 25%, transparent 25%) 0 -50px, linear-gradient(225deg, #ECEDDC 25%, transparent 25%), linear-gradient(315deg, #ECEDDC 25%, transparent 25%); background-size: 20px 20px; background-color: #EC173A; } <div class=

问题 I am still learning Scilab (5.5.2), so I am writing and running test codes to familiarize myself with the software. To test the numerical differential equation solver, I started easy from the equation dy/dx = A , which has as solution y = Ax+c (line equation). This is the code I wrote: // Function y = A*x+1 function ydot=fn(x, A) ydot=A endfunction A=2; //Initial conditions x0=0; y0=A*x0+1; //Numerical Solution x=[0:5]; y= ode(y0,x0,x,fn); //Analytical solution y2 = A*x+1; clf(); plot(x, y);

问题 I'm trying to use colormap to assign colors to lines on a plot. The data for each line is generated from a file, and the number of files imported/ lines plotted are variable each time. My code for this is: d = uigetdir(pwd, 'Select a folder'); files = dir(fullfile(d, '*.txt')); len = length(files); for i = 1:len a = files(i).name; filename{i} = a; path = [d,'\',a]; colour = round(random('unif',0,200,1,3))/255; data = dlmread(path); plot(data(:,1), data(:,2),'color',colour,'linewidth',2); hold

问题 I'm trying to draw a line where by clicking a button, the line "grows" to a further x and y point that are the next numbers in the data array while the previous x and y points that have already been "drawn" remain there. I was able to successfully make this work by adding X2 and Y2 attributes to my line on a click function, but I'd like it to be so where you click again, the line grows to the next X and Y point in the data array: dataGDP[2].date and dataGDP[2].GDPreal. var realGDPline =

问题 I have two lines specified by two points with x and y coordinate each. The first point (where the lines begin) is equal meaning that I have 3 points A, B and C where one line is from A to B and the other one from A to C. I would then want to calculate the angle between the two lines starting at the right side of the first line . The result needn't be accurate I actually only need to know if this angle is greater or less than 180° (π rad). Thanks for any help - you needn't write any code,

问题 I want to delete a single line through a JButton in Jframe. But I don't know how... I allready tried: public void button1_ActionPerformed(ActionEvent evt) { int count = 1; count = TextArea1.getLineCount(); But it's not working... I appreciate every kind of help :)) Or anyone knews another method to solve this problem? 回答1: You need to use GetText() to get what is already in the TextArea and then remove the line. Once you have modified the text you can put it back using SetText(). Of course

问题 i used image.HoughLine to find line in my image. i want to know the angle of each line. so i tried : double deltaY = line.P2.Y - line.P1.Y; double deltaX = line.P2.X - line.P1.X; double angle; if (deltaX != 0) angle = Math.Atan2(deltaY, deltaX); else angle = 90; but , it returns 0 and -1 , while the lines in image at least have 15 degree . ( i rotated the image myself ). what's wrong? and what is Direction in LineSegment2D class, could it help ? 回答1: I Found myself the solution. you know what

问题 i want to include scrollbar and navigator, range selector functionality in my line graph . something similar to http://www.highcharts.com/products/highstock Can this be done on d3 if so give me a link on a tutorial or code. the code is var margin = {top: 10, right: 10, bottom: 100, left: 40}, margin2 = {top: 430, right: 10, bottom: 30, left: 40}, width = 2000 - margin.left - margin.right, height = 500 - margin.top - margin.bottom, height2 = 500 - margin2.top - margin2.bottom; var parseDate =