Question link: POJ-1696 Question meaning have n n n points, among which y y The point with the smallest y coordinate is recorded as ( x A , y A ) (x_A,y_A) (xA?,yA?), an ant starts from ( 0 , y A ) (0,y_A) (0,yA?) can only turn left or go straight in the current […]
Tag: geometry
Computational Geometry +2sat: 1020T3
http://cplusoj.com/d/senior/p/SS231019C We do this conversion Then 0/1 must choose one, and 2/3 must choose one. Then it becomes a 2sat problem If two triangles intersect, one can be selected and the other cannot be selected. One of the diagonal triangles is chosen and one is not chosen. One does not choose, one chooses The triangle […]
Use of PreferenceKey/preference key, GeometryPreferenceKey/geometry view preference key, ScrollViewOffsetPreferenceKey/scroll view offset preference key
1. Basic use of PreferenceKey preference key 1.1 Create a basic usage view of the preference key PreferenceKeyBootcamp.swift import SwiftUI /// Preferences/Preferences key struct PreferenceKeyBootcamp: View { @State private var text: String = “Hello, world!” var body: some View { NavigationView { VStack { SecondaryScreen(text: text) .navigationTitle(“Navigation Title”) } } .onPreferenceChange(CustomTitlePreferenceKey.self) { value in if […]
[Transfer] [Revit] Revit secondary development – reading CAD geometry and text based on teigha (providing source code, reference package and exception resolution)…
1. Download the 64-bit Teigha complete package: Link: https://pan.baidu.com/s/1KXW54YlkkWJZNQYhbc99kw Extraction code: 0505 2. Choose 64-bit VS platform architecture, .net version 4.0 or above: 3.dll must be referenced manually: (emphasis) static string dll = @”D:\Desktop\Rvt\bin\Debug\TD_Mgd.dll”;//Reference location Assembly a = Assembly.UnsafeLoadFrom(dll); 4. If the above precautions are not handled correctly, the following exception will occur:1. Not a […]
ScrollViewReader/Positioning scroll view, GeometryReader/Getting view update parameters, MultipleSheets/Multiple working views, Mask/Usage of five-star evaluation view
1. ScrollViewReader positions the scroll view 1.1 Implementation /// Position the scroll view struct ScrollViewReaderBootcamp: View { @State var scrollToIndex: Int = 0 @State var textFiledText: String = “” var body: some View { VStack { TextField(“Enter a # here…”, text: $textFiledText) .padding(.horizontal) .frame(height: 55) .border(Color.gray) .padding(.horizontal) .keyboardType(.numberPad) Button(“Scroll now”) { // add animation if […]
External pole geometry OpenCV-Python v4.7.0
Goals In this section We will learn the basics of multi-view geometry We will learn what are external poles, external pole lines, external pole constraints, etc. Basic concepts When capturing an image using a pinhole camera, we lose an important piece of information, the depth of the image. In other words, how far each point […]
Computational Geometry 06The ultimate secret of computational geometry
There are two classic methods in computational geometry, also known as the ultimate secret (actually it can only be used when there is no other way) – enumeration and divide and conquer. The final secret is generally used when the number of geometric points is small and other algorithms cannot solve it correctly Enumeration and […]
[SLAM] Front-end-Visual Odometer’s Antipolar Geometry
Article directory [SLAM] Front-end-Visual Odometer’s Antipolar Geometry 1. Epipolar geometry 2.Essential matrix and its solution 3. Homography matrix and its solution 3. Triangulation 4.Think 4.1 What are the degrees of freedom of the essential matrix? 4.2 The process of finding the essential matrix by direct method involves solving homogeneous linear equations. For solutions to homogeneous […]
UnityGeometry Shader implementation
https://www.cnblogs.com/jaffhan/p/7565178.html Unity’s official documentation has less content about Geometry Shader. However, it is also because most Unity developers are oriented towards mobile platform development, so Geometry Shader, as a feature of DirectX 10, has not been widely used by developers. First of all, you need to know the difference between Geometry Shader, Vertex Shader and […]
poj2826 An Easy Problem?! (Computational Geometry)
portal ?Question meaning Two wooden blocks form a slot, given the two endpoints of the two wooden blocks Rainwater falls vertically. How much rainwater can be held in the trough? ?Thoughts Find situations where rainwater cannot be collected We let the higher point of the line segment be point s and the lower point be […]