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问题 SOLUTION AT BOTTOM OF THIS QUESTION I have this code: public void lineImproved(int x0, int y0, int x1, int y1, Color color) { int pix = color.getRGB(); int dx = x1 - x0; int dy = y1 - y0; raster.setPixel(pix, x0, y0); if (Math.abs(dx) > Math.abs(dy)) { // slope < 1 float m = (float) dy / (float) dx; // compute slope float b = y0 - m*x0; dx = (dx < 0) ? -1 : 1; while (x0 != x1) { x0 += dx; raster.setPixel(pix, x0, Math.round(m*x0 + b)); } } else if (dy != 0) { // slope >= 1 float m = (float)

问题 I have several random line segments. I have to check if there is any intersection between any two line segments. Lines may be connected or not. What would be a good algorithm for this problem? 回答1: Assuming you're talking about line segments here (otherwise, simply compare the slopes of the lines: if they have unequal slopes, they intersect). To find out if a [single] intersection exists in a set of 2 or more line segments, you can use the Shamos-Hoey algorithm. To find all intersections in a

问题 I want to crop the image between two lines, as shown in the image below. But the bottom line is not recognized well with HoughLinesP . The bottom line points are not really edged because of eroding, but is it important? How can I detect the bottom line, and then crop the image according to these 2 lines? Original image: Processed image: Canny edged: Lines detected: Code For Line Detection : Mat dst, cdst,src2; cv::blur( src, src2, cv::Size(5,5) ); Canny(src2, dst, 150, 300, 5); cvtColor(dst,

问题 Here is the code: local physics = require "physics" physics.start() local lines = {} local lineGroup = display.newGroup() local prevX,prevY local isDrawing = false local i = 0 local function distanceBetween(x1, y1, x2, y2) local dist_x = x2 - x1 local dist_y = y2 - y1 local distanceBetween = math.sqrt((dist_x*dist_x) + (dist_y*dist_y)) return distanceBetween end local function drawLine(e) if(e.phase == "began") then prevX = e.x prevY = e.y isDrawing = true i = i + 1 print"began" elseif(e

问题 I want to adjust the line spacing of edittext. I use a long line, and when I cross the line, linespacing is applied. However, linespacing does not apply when I input Enter key. 回答1: This Library fixed the EditText linespacing issue https://github.com/hanks-zyh/LineHeightEditText 回答2: use this code for line space between two line android:lineSpacingExtra="10dp" whole code is <EditText android:id="@+id/edittext" android:layout_margin="@dimen/activity_horizontal_margin" android:layout_width=

问题 This question already has answers here : How to add a carriage return to XML output in Java (3 answers) Closed 5 years ago . I referred to the following tutorial to create XML file using JAVA. http://www.mkyong.com/java/how-to-create-xml-file-in-java-dom/ However, when I open the xml file, it appears in 1 extremely long single line. This makes it very hard for me to verify the result, and I am sure it is possible to have linebreaks for every element tag. But I do not have any clue how to do

问题 I created a line chart, and added a button whose click method make the line thicker (lineWidth 7pt). However, each time I mouse over the line or the legend, the line restore to its original width (which I believe is 2 pt). So I added the following plot options to disable the "hover" function: line: { states: { hover: { enabled: false, } } }, But it only resolves the issue partially -- after I set lineWidth to 7 pt using the button, the line width will still be reset to its original 2 pt after

问题 I need to draw a tangent to a curve at a particular point (say the point is chosen by the user). I have written a code that allows the user to manually pick up two points and then a line is drawn between them. But I would like to automate the process. Can someone please suggest any algorithms/already implemented matlab codes to do so? 回答1: Try the function below. Of course, it needs lots of tweaking to apply to your case, but I think this is roughtly what you want. function test hh = figure(1