pan

How to zoom to center of canvas, not to center of context

由 荒凉一梦 提交于 2021-02-08 06:52:48
问题 I have a canvas, size 400 x 400. On it, i have drawn a map area, 200 x 200. I have translated this to the center of the canvas. I can zoom in and out, all is well. But, when i pan, it zooms from the center of my map area. I want it to always zoom from the center of the canvas no matter where the map area is. I think i need to negate the pan coords somehow, but i can't figure it out. Here is my code: var canvas = document.getElementById("myCanvas"); var ctx = canvas.getContext("2d"); var

Moving Camera in SpriteKit Swift

由 蹲街弑〆低调 提交于 2021-02-07 03:06:12
问题 I am creating a game in sprite kit using swift, and I am trying to be able to move the SKScene around with a finger because not all of the nodes fit within the scene. I have already created world, overlay, and camera nodes with this code. override func didMoveToView(view: SKView) { world = self.childNodeWithName("world")! if !isCreated { isCreated = true // Camera setup self.anchorPoint = CGPoint(x: 0.5, y: 0.5) self.world = SKNode() self.world.name = "world" addChild(self.world) self.cam =

Moving Camera in SpriteKit Swift

由 你。 提交于 2021-02-07 03:03:16
问题 I am creating a game in sprite kit using swift, and I am trying to be able to move the SKScene around with a finger because not all of the nodes fit within the scene. I have already created world, overlay, and camera nodes with this code. override func didMoveToView(view: SKView) { world = self.childNodeWithName("world")! if !isCreated { isCreated = true // Camera setup self.anchorPoint = CGPoint(x: 0.5, y: 0.5) self.world = SKNode() self.world.name = "world" addChild(self.world) self.cam =

emgucv: pan card improper skew detection in C#

由 北慕城南 提交于 2020-06-29 04:00:09
问题 I am having three image of pan card for testing skew of image using emgucv and c#. 1st image which is on top Detected 180 degree working properly. 2nd image which is in middle Detected 90 dgree should detected as 180 degree. 3rd image Detected 180 degree should detected as 90 degree. One observation I am having that i wanted to share here is when i crop unwanted part of image from up and down side of pan card using paint brush, it gives me expected result using below mention code. Now i

emgucv: pan card improper skew detection in C#

由 夙愿已清 提交于 2020-06-29 04:00:03
问题 I am having three image of pan card for testing skew of image using emgucv and c#. 1st image which is on top Detected 180 degree working properly. 2nd image which is in middle Detected 90 dgree should detected as 180 degree. 3rd image Detected 180 degree should detected as 90 degree. One observation I am having that i wanted to share here is when i crop unwanted part of image from up and down side of pan card using paint brush, it gives me expected result using below mention code. Now i

Swift开发：仿Clear手势操作(拖拽、划动、捏合)UITableView

由 大兔子大兔子 提交于 2020-04-17 03:32:26
【推荐阅读】微服务还能火多久？>>> 这是一个完全依靠手势的操作ToDoList的演示，功能上左划删除，右划完成任务，拖拽调整顺序，捏合张开插入。 项目源码: https://github.com/luan-ma/ClearStyleDemo.Swift 初始化 TDCToDoItem.swift 定义模型对象 TDCToDoListController.swift 继承自 UITableViewController， 演示UITableView操作 var items = [ TDCToDoItem(text: "Feed the cat"), TDCToDoItem(text: "Buy eggs"), TDCToDoItem(text: "Pack bags for WWDC"), TDCToDoItem(text: "Rule the web"), TDCToDoItem(text: "Buy a new iPhone"), TDCToDoItem(text: "Find missing socks"), TDCToDoItem(text: "Write a new tutorial"), TDCToDoItem(text: "Master Objective-C"), TDCToDoItem(text: "Remember your wedding anniversary

百度网pan下载-IDM+油猴

由 瘦欲@ 提交于 2020-03-17 06:40:25
所需工具： chrome浏览器 油猴插件 百度网盘插件 Internet Download Manager 1. 安装上述所需工具 IDM 插件会在IDM软件安装完毕后自动安装，只需在chrome浏览器扩展中启用即可，chrome://extensions/ 2.下载操作 打开网页百度网盘，选中所需下载资源，点击生成连接，点击链接，选择IDM下载即可。 3.tips (1)出现无权限下载错误，在弹出的窗口里修改应用 ID 为 778750。 有些文件需要用 ID 250528 下载，有些文件又需要用 778750 ，也就是在这两个 ID 之间来回切换。 (2)更新IDM插件。 (3)不要在「分享页面」上使用，打开百度网盘页面选择资源下载 来源： CSDN 作者： Mr-LH 链接： https://blog.csdn.net/niuchi2570/article/details/104855902

Python数据分析与挖掘所需的Pandas常用知识

由 99封情书 提交于 2020-03-01 08:42:49
Pandas基于两种数据类型：series与dataframe。 一个series是一个一维的数据类型，其中每一个元素都有一个标签。series类似于Numpy中元素带标签的数组。其中，标签可以是数字或者字符串。 一个dataframe是一个二维的表结构。Pandas的dataframe可以存储许多种不同的数据类型，并且每一个坐标轴都有自己的标签。你可以把它想象成一个series的字典项。 Pandas常用知识 一、读取csv文件为dataframe 二、dataframe的数据概况 三、取列数据 四、取行数据 五、取某一单元格数据 六、缺失值处理 七、归一化处理 八、排序 九、索引重新编号 十、求均值 十一、矢量化操作（批量操作） 十二、透视表 一、读取csv文件为dataframe Pandas很好的一点是，可以操作表文件。输出为dataframe格式，这点很nice。 使用pandas.read_csv()读取csv文件，输出为dataframe格式数据。 这里数据data.csv数据集下载自百度地图。 import pandas as pd filepath = r'C:/Users/lenovo/Desktop/20180108-百度地图/20180108-百度地图/data.csv' df = pd.read_csv(filepath) #为了方便，我只显示三行

Flutter: How to implement Rotate and Pan/Move gesture for any container?

由 孤者浪人 提交于 2020-02-23 07:08:48
问题 I have implemented the Scale gesture for the container. Also, I have added onHorizontalDragUpdate and onVerticalDragUpdate. But when I try to add both, I get an exception saying can't implement both with Scale gesture. Even for Pan gesture, it throws the same exception. Below is my code: import 'package:flutter/material.dart'; import 'package:vector_math/vector_math_64.dart' hide Colors; import 'dart: math' as math; class HomeScreen extends StatefulWidget { @override State<StatefulWidget>

Flutter: How to implement Rotate and Pan/Move gesture for any container?

由 本秂侑毒 提交于 2020-02-23 07:08:12
问题 I have implemented the Scale gesture for the container. Also, I have added onHorizontalDragUpdate and onVerticalDragUpdate. But when I try to add both, I get an exception saying can't implement both with Scale gesture. Even for Pan gesture, it throws the same exception. Below is my code: import 'package:flutter/material.dart'; import 'package:vector_math/vector_math_64.dart' hide Colors; import 'dart: math' as math; class HomeScreen extends StatefulWidget { @override State<StatefulWidget>
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