line

问题 I want to draw a line chart in flutter. I follow this tutorial, it works fine if the date and month is different. But why if it only has one date and one point, the graph turn to this? Code /// Timeseries chart example import 'package:charts_flutter/flutter.dart' as charts; import 'package:flutter/material.dart'; void main() { runApp( MaterialApp( title: 'My app', // used by the OS task switcher theme: ThemeData( accentIconTheme: const IconThemeData.fallback().copyWith( color: Colors.white, )

问题 I want to draw a line chart in flutter. I follow this tutorial, it works fine if the date and month is different. But why if it only has one date and one point, the graph turn to this? Code /// Timeseries chart example import 'package:charts_flutter/flutter.dart' as charts; import 'package:flutter/material.dart'; void main() { runApp( MaterialApp( title: 'My app', // used by the OS task switcher theme: ThemeData( accentIconTheme: const IconThemeData.fallback().copyWith( color: Colors.white, )

问题 In Java, I have a class Line that has two variables : m and b , such that the line follows the formula mx + b . I have two such lines. How am I to find the x and y coordinates of the intersection of the two lines? (Assuming the slopes are different) Here is class Line : import java.awt.Graphics; import java.awt.Point; public final class Line { public final double m, b; public Line(double m, double b) { this.m = m; this.b = b; } public Point intersect(Line line) { double x = (this.b - line.b)

问题 I am trying to draw a line on an image using mouse operations. I am using OpenCV library. My code import matplotlib.pyplot as plt import cv2 src_window = 'CV2 Window' SHOW_DEBUG_STEPS = True drag = 0 select_flag = 0 x1 = 0 x2 = 0 y1 = 0 y2 = 0 point1 = [x1,y1] point2 = [x2,y2] SCALAR_YELLOW = (0.0,255.0,255.0) cap = cv2.VideoCapture('example_01.mp4') def closeAll(): cap.release() cv2.destroyAllWindows() def retn(ret): if not ret: print('Error reading the frame') closeAll() def frm(fFrame): if

问题 What is the reason that lw 0 doesn't have zero linewidth, i.e. invisible? What I find in the gnuplot manual: The line width and point size are multipliers for the current terminal's default width ... Ok, if lw 0 is a multiplier then the resulting linewidth should be zero independent of the terminal's default linewidth. The reason for asking is to eventually have the possibility to use with linespoints and programmatically switch within a loop between with lines and with points . Code: ###

问题 I know there exist some functions like lineRenderer etc, but I want to create a straight line in the scene using two points(in Vector3 form). I don't want to draw the line by using any key or using the mouse, I just want to see the line in the scene when I trigger some event or just after I click play button. Can anyone help me? 回答1: Ok, I've figured it out by using LineRenderer like this: var line: GameObject=GameObject.Find("/LineRenderer"); fence = Instantiate(line,Pos,Rotation); fence

问题 I'm having trouble reading an entire specific line of a text file using Python. I currently have this: load_profile = open('users/file.txt', "r") read_it = load_profile.readline(1) print read_it Of course this will just read one byte of the first line, which is not what I want. I also tried Google but didn't find anything. 回答1: What are the conditions of this line? Is it at a certain index? Does it contain a certain string? Does it match a regex? This code will match a single line from the

问题 I'd like to run a macro on every line in a selection, rather than totalling up the number of lines in my head. For instance, I might write a macro to transform: Last, First Into First Last and I'd like it to run on all these lines: Stewart, John Pumpkin, Freddy Mai, Stefan ... Any ideas Vim gurus? EDIT: This is just an example, obviously this is trivialy regexable, but there are other instances that come up that aren't quite so easy that I'd prefer to use macros. 回答1: Suppose you had a macro

问题 I am creating a java application and wanting to make it so that a user can click on a line in order to make an event occur. The line is simply defined by its 2 endpoints, both of which have a x and a y coordinate. Any ideas on how I can I can check if a position collected from the mouse press event (with a x and y coordinate) can be checked to see if it is on this line? I want to make it so that the hit detection for the line is a little bit forgiving for the user so that as long as the mouse

问题 Is there a possibility to force JLists to display all items on one line? setOrientationLayout() does not give you that option. 回答1: list.setLayoutOrientation(JList.HORIZONTAL_WRAP); list.setVisibleRowCount(1); 来源： https://stackoverflow.com/questions/7144689/force-jlist-to-not-wrap-at-all