19、GTK开发:绘图程序、应用技巧与信号机制全解析

GTK开发:绘图程序、应用技巧与信号机制全解析

1. 简单绘图程序Scribble

在开发绘图程序时,我们可以借助扩展设备信息来丰富程序的功能。当设备启用后,我们就能使用事件结构额外字段中的扩展设备信息。即便未启用扩展事件,这些字段也会有合理的默认值,所以使用这些信息是安全的。

在操作上,我们需要调用 gdk_input_window_get_pointer() 函数来替代 gdk_window_get_pointer ,因为后者不会返回扩展设备信息。 gdk_input_window_get_pointer 函数的原型如下:

void gdk_input_window_get_pointer( GdkWindow *window,
                                   guint32 deviceid,
                                   gdouble *x,
                                   gdouble *y,
                                   gdouble *pressure,
                                   gdouble *xtilt,
                                   gdouble *ytilt,
                                   GdkModifierType *mask)
cargo run -- --force-gtk4 Using GTK version: gtk4 AppStateManager 正在运行... 当前应用状态: AppState { counter: 0, data: [], config: Config { theme: "", language: "", auto_save: false } } 性能统计 - 平均读取: 51.11μs, 平均写入: 0.00μs, 读写比例: 1.0:1 检测到写操作增加,建议使用 Mutex 性能统计 - 平均读取: 0.00μs, 平均写入: 0.00μs, 读写比例: 0.0:1 Running main application with multi-threading support and window management. SHA256 digest: SHA256:b94d27b9934d3e08a52e52d7da7dabfac484efe37a5380ee9088f7ace2efcde9 Loading user: 1: Alice Loading user: 2: Bob Loading user: 3: Charlie Loaded 3 users from database Database setup completed successfully Starting Linux GTK4 application... Linux GTK4 application activating... Message system initialized ✓ Added cell at row 0, col 0, text: 'Cell 0-0' ✓ Added cell at row 0, col 1, text: 'Cell 0-1' ✓ Added cell at row 0, col 2, text: 'Cell 0-2' ✓ Added cell at row 0, col 3, text: 'Cell 0-3' ✓ Added cell at row 0, col 4, text: 'Cell 0-4' ✓ Added cell at row 1, col 0, text: 'Cell 1-0' ✓ Added cell at row 1, col 1, text: 'Cell 1-1' ✓ Added cell at row 1, col 2, text: 'Cell 1-2' ✓ Added cell at row 1, col 3, text: 'Cell 1-3' ✓ Added cell at row 1, col 4, text: 'Cell 1-4' ✓ Added cell at row 2, col 0, text: 'Cell 2-0' ✓ Added cell at row 2, col 1, text: 'Cell 2-1' ✓ Added cell at row 2, col 2, text: 'Cell 2-2' ✓ Added cell at row 2, col 3, text: 'Cell 2-3' ✓ Added cell at row 2, col 4, text: 'Cell 2-4' ✓ Added cell at row 3, col 0, text: 'Cell 3-0' ✓ Added cell at row 3, col 1, text: 'Cell 3-1' ✓ Added cell at row 3, col 2, text: 'Cell 3-2' ✓ Added cell at row 3, col 3, text: 'Cell 3-3' ✓ Added cell at row 3, col 4, text: 'Cell 3-4' ✓ Added cell at row 4, col 0, text: 'Cell 4-0' ✓ Added cell at row 4, col 1, text: 'Cell 4-1' ✓ Added cell at row 4, col 2, text: 'Cell 4-2' ✓ Added cell at row 4, col 3, text: 'Cell 4-3' ✓ Added cell at row 4, col 4, text: 'Cell 4-4' (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:38:21-23: Percentages are not allowed here (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:65:13-21: No property named "position" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:69:13-16: No property named "top" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:70:13-17: No property named "left" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:71:13-18: No property named "right" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:75:13-19: No property named "bottom" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:76:13-17: No property named "left" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:77:13-18: No property named "right" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:81:13-16: No property named "top" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:82:13-19: No property named "bottom" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:83:13-17: No property named "left" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:87:13-16: No property named "top" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:88:13-19: No property named "bottom" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.778: Theme parser error: <data>:89:13-18: No property named "right" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.779: Theme parser error: <data>:101:13-28: No property named "backdrop-filter" (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.779: Theme parser error: <data>:105:35-40: Percentages are not allowed here (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.779: Theme parser error: <data>:109:35-39: Percentages are not allowed here (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.779: Theme parser error: <data>:113:35-40: Percentages are not allowed here (baota-gtk4:33879): Gtk-WARNING **: 09:31:23.779: Theme parser error: <data>:117:35-39: Percentages are not allowed here (baota-gtk4:33879): GLib-GObject-CRITICAL **: 09:31:23.779: cannot register existing type 'GdkDisplayManager' (baota-gtk4:33879): GLib-CRITICAL **: 09:31:23.779: g_once_init_leave_pointer: assertion 'result != 0' failed (baota-gtk4:33879): GLib-GObject-CRITICAL **: 09:31:23.779: g_object_new_with_properties: assertion 'G_TYPE_IS_OBJECT (object_type)' failed 段错误 (核心已转储) cargo run -- --flutter --force-linux Running `/home/kingjeeps/target/debug/baota-gtk4 --flutter --force-linux` === 运行 Cairo 功能测试 === 当前工作目录: "/media/kingjeeps/stc3/baota-gtk4" 检查路径: Pictures/test_image.png -> 存在: true 检查路径: ../Pictures/test_image.png -> 存在: false 检查路径: ./Pictures/test_image.png -> 存在: true 检查路径: /media/kingjeeps/stc3/baota-gtk4/Pictures/test_image.png -> 存在: true IoError(Custom { kind: Other, error: "测试 IO 错误" }) Image dimensions: 100x100 图像加载成功,尺寸: 100x100 图像颜色类型: Rgb8 Read integer: 1196314761 图像信息: 颜色类型: Rgb8 宽度: 800 高度: 600 Context 绘图操作完成 === 启动 GTK Cairo 应用程序 === 未知选项 --flutter error: unexpected argument '--flutter' found 这个在cargo run时无错误,在cargo run -- --flutter --force-linux时无法识别:未知选项 --flutter ,然后退出,为什么?
10-25
内容概要:本文设计了一种基于PLC的自动洗衣机控系统内容概要:本文设计了一种,采用三菱FX基于PLC的自动洗衣机控系统,采用3U-32MT型PLC作为三菱FX3U核心控器,替代传统继-32MT电器控方式,提升了型PLC作为系统的稳定性自动化核心控器,替代水平。系统具备传统继电器控方式高/低水,实现洗衣机工作位选择、柔和过程的自动化控/标准洗衣模式切换。系统具备高、暂停加衣、低水位选择、手动脱水及和柔和、标准两种蜂鸣提示等功能洗衣模式,支持,通过GX Works2软件编写梯形图程序,实现进洗衣过程中暂停添加水、洗涤、排水衣物,并增加了手动脱水功能和、脱水等工序蜂鸣器提示的自动循环控功能,提升了使用的,并引入MCGS组便捷性灵活性态软件实现人机交互界面监控。控系统通过GX。硬件设计包括 Works2软件进行主电路、PLC接梯形图编程线关键元,完成了启动、进水器件选型,软件、正反转洗涤部分完成I/O分配、排水、脱、逻辑流程规划水等工序的逻辑及各功能模块梯设计,并实现了大形图编程。循环小循环的嵌; 适合人群:自动化套控流程。此外、电气工程及相关,还利用MCGS组态软件构建专业本科学生,具备PL了人机交互C基础知识和梯界面,实现对洗衣机形图编程能力的运行状态的监控操作。整体设计涵盖了初级工程技术人员。硬件选型、; 使用场景及目标:I/O分配、电路接线、程序逻辑设计及组①掌握PLC在态监控等多个方面家电自动化控中的应用方法;②学习,体现了PLC在工业自动化控中的高效自动洗衣机控系统的性可靠性。;软硬件设计流程 适合人群:电气;③实践工程、自动化及相关MCGS组态软件PLC的专业的本科生、初级通信联调工程技术人员以及从事;④完成PLC控系统开发毕业设计或工业的学习者;具备控类项目开发参考一定PLC基础知识。; 阅读和梯形图建议:建议结合三菱编程能力的人员GX Works2仿真更为适宜。; 使用场景及目标:①应用于环境MCGS组态平台进行程序高校毕业设计或调试运行验证课程项目,帮助学生掌握PLC控系统的设计,重点关注I/O分配逻辑、梯形图实现方法;②为工业自动化领域互锁机及循环控结构的设计中类似家电控系统的开发提供参考方案;③思路,深入理解PL通过实际案例理解C在实际工程项目PLC在电机中的应用过程。控、时间循环、互锁保护、手动干预等方面的应用逻辑。; 阅读建议:建议结合三菱GX Works2编程软件和MCGS组态软件同步实践,重点理解梯形图程序中各环节的时序逻辑互锁机,关注I/O分配硬件接线的对应关系,并尝试在仿真环境中调试程序以加深对自动洗衣机控流程的理解。
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