allegro | 易学教程

Allegro-修改Shape边界

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Shape画好后并不能一次成形想要小修小改怎么办？解决方案：方案一：单击 Shape select 图标想要修改的Shape边界拐点出现小方框可以拖动小方框到想要的位置也可以把鼠标放在边界线上出现双向箭头后可以整体拖动方案二：单击 Shape Edit Boundary 图标单击想要修改的边界线按照想要修改的外形重新画边界欢迎关注公众号学习更多硬件知识来源： CSDN 作者：米恩学习呢链接： https://blog.csdn.net/qq_41038655/article/details/103604554

Equality Operator Overloading in Allegro

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问题 One of my friends is trying to overload an equality operator for comparing colours in Allegro, however it does not work,He gets the error "no match for operator==" This is overloaded outside the Color class/struct, the overloaded operator function is shown below: typedef ALLEGRO_COLOR Color; bool operator==(const Color& rhs) const { if(_col.a==rhs.a && _col.b==rhs.b && _col.g==rhs.g && _col.r==rhs.r) return true; else return false; } . . . //Data member Color _col Im thinking this does not

Allegro native dialogues not recognized

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问题 I got allegro5 set up, and simple programs (like displaying a window, filling it with a black background) work fine. When I try importing other headers (like native dialogs) though, I run into problems. For example, when compiling this code #include <allegro5/allegro.h> #include <allegro5/allegro_native_dialog.h> int main(){ if(al_init()) { al_show_native_message_box(al_get_current_display(), "Window Title", "Content Title", "The error message here", NULL, ALLEGRO_MESSAGEBOX_ERROR); return 0;

how do you make a background in allegro with c++?

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问题 i'm fairly new at programming with allegro, and i wanna change the background color of my programs from something more pleasant than black haha :) can some one help please? and just for a reference of what im doing #include <allegro.h> BITMAP* buffer; BITMAP* bmp; int cursor_x = 20; int cursor_y = 20; int getMouseInfo(){ if(mouse_b & 1){ cursor_x = mouse_x; cursor_y = mouse_y; return 1; } return 0; } void updateScreen(){ show_mouse(NULL); circlefill ( buffer, cursor_x, cursor_y, 60, makecol(

Anti-aliasing in allegro 5

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问题 How do I make allegro 5 use anti-aliasing when drawing? I need diagonal lines to appear smooth. Currently, they are only lines of shaded pixels, and the edges look hard. 回答1: To enable anti aliasing for the primitives: // before creating the display: al_set_new_display_option(ALLEGRO_SAMPLE_BUFFERS, 1, ALLEGRO_SUGGEST); al_set_new_display_option(ALLEGRO_SAMPLES, 8, ALLEGRO_SUGGEST); display = al_create_display(640, 480); Note that anti-aliasing will only work for primitives drawn directly to

cannot compile allegro using visual c++

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问题 I just downloaded the allegro library I make a new empty project then add a source file I add this line of code: #include <allegro.h> I compile and get the following error: c:\allegro\include\allegro5\internal\alconfig.h(28) : fatal error C1083: Cannot open include file: 'allegro5/platform/alplatf.h': No such file or directory so I go into alconfig.h and change: #include "allegro5/platform/alplatf.h" to: #include "../../allegro5/platform/alplatf.h.cmake" it now gives me this error: c:\allegro

Compiler detects allegro.h, but not allegro_primitives.h

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问题 When I compile my Allegro 5 program using g++, it complains about undefined reference to 'al_init_primitives_addon', al_draw_filled_rectangle and other such functions that are found in allegro_primitives.h. It does not complain about functions in allegro.h like al_create_display . Includes: #include <allegro5/allegro.h> #include <allegro5/allegro_primitives.h> #include "objects.h" #include "main.h" Compiler command: g++ main.cpp -o game -lallegro -I/usr/include/allegro5 -L/usr/lib/allegro5

Undefined reference to 'main'

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问题 You got to love linker errors *sarcasm*. Any way, I am developing a psp game using the psp port of allegro which came with pspsdk. And after I fixed all the other undefined references this one stumps me. The full error message and makefile and code below: Error details 1>------ Build started: Project: PSP Pong, Configuration: Debug Win32 ------ 1> psp-g++ -I. -IC:/pspsdk/psp/sdk/include -O2 -G0 -Wall -I. -IC:/pspsdk/psp/sdk/include -O2 -G0 -Wall -fno-exceptions -fno-rtti -D_PSP_FW_VERSION=150

硬件工程师离不开的那些电路设计工具，你会有几个呢

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　　EDA技术是在电子CAD技术基础上发展起来的计算机软件系统，是指以计算机为工作平台，融合了应用电子技术、计算机技术、信息处理及智能化技术的最新成果，进行电子产品的自动设计。利用EDA工具，可以将电子产品从电路设计、性能分析到设计出IC版图或PCB版图的整个过程在计算机上自动处理完成。　　　　EDA常用软件　　EDA工具层出不穷，目前进入我国并具有广泛影响的EDA软件有：protel、MentorPADS、OrCAD、Mentor WG、Mentor EN、allegro、EWB、PSPICE、 Synopsys等等。按主要功能或主要应用场合，大致可分为电路设计与仿真工具、PCB设计软件、IC设计软件、PLD设计工具及其它EDA软件。　　电子电路设计与仿真工具　　电子电路设计与仿真工具包括：　　SPICE/PSPICE、EWB、Matlab、SystemView、Multisim、MMICAD等。下面简单介绍前三个软件。　　1)SPICE：由美国加州大学推出的电路分析仿真软件，现在用得较多的是PSPICE6.2，在同类产品中是功能最为强大的模拟和数字电路混合仿真 EDA软件，它可以进行各种各样的电路仿真、激励建立、温度与噪声分析、模拟控制、波形输出、数据输出、并在同一窗口内同时显示模拟与数字的仿真结果。无论对哪种器件哪些电路进行仿真，都可以得到精确的仿真结果

Allegro 5 crashes on calling al_clear_to_color(ALLEGRO_COLOR)

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问题 I'm starting at Allegro 5, but soon I got stuck in the second hello-world-like program I'm coding. After some debugging, I concluded that the program crashes when it calls the function al_clear_to_color(ALLEGRO_COLOR) . I've tried linking allegro statically and dynamically, but the problem still remains. I'm completely lost. Here is the code: #include <cstdio> #include <allegro5/allegro.h> int main() { ALLEGRO_DISPLAY *display; ALLEGRO_KEYBOARD_STATE kbState; if(!al_init()) return 0; if(!al