新手：将 RGB 渲染为 GTK 小部件 - 如何？

发布于 2024-09-01 12:41:32 字数 900 浏览 9 评论 0原文

大图：我想在 Linux 机器上通过 GTK 渲染 RGB 图像。

我是一个沮丧的 GTK 新手，所以请原谅我。

我假设我应该创建一个 Drawable_area 来渲染图像——正确吗？

然后我是否必须创建附加到该区域的图形上下文？如何？

我的简单应用程序（甚至还没有解决 RGB 问题，是这样的：

int main(int argc, char** argv) {

GdkGC     * gc     = NULL;
GtkWidget * window = NULL;
GtkDrawingArea * dpage = NULL;
GtkWidget * page = NULL;

gtk_init( &argc, & argv );

window = gtk_window_new( GTK_WINDOW_TOPLEVEL );
page = gtk_drawing_area_new( );
dpage = GTK_DRAWING_AREA( page );
gtk_widget_set_size_request( page, PAGE_WIDTH, PAGE_HEIGHT );
gc = gdk_gc_new( GTK_DRAWABLE( dpage ) );

gtk_widget_show( window );
gtk_main();

return (EXIT_SUCCESS);

}

我的 dpage 显然不是“可绘制”（尽管它是一个绘图区域）。我是对于以下问题感到困惑：a）如何获取/创建后续函数调用所需的图形上下文？ b) 我是否接近解决方案，或者我是否已经完全*#&@&错误的是没有希望 c) 婴儿学步教程。（我以 hello world 为基础开始，所以我已经做到了这一点）。

任何和所有的帮助表示赞赏。

原文

Big picture: I want to render an RGB image via GTK on a linux box.

I'm a frustrated GTK newbie, so please forgive me.

I assume that I should create a Drawable_area in which to render the image -- correct?

Do I then have to create a graphics context attached to that area? How?

my simple app (which doesn't even address the rgb issue yet is this:

int main(int argc, char** argv) {

GdkGC     * gc     = NULL;
GtkWidget * window = NULL;
GtkDrawingArea * dpage = NULL;
GtkWidget * page = NULL;

gtk_init( &argc, & argv );

window = gtk_window_new( GTK_WINDOW_TOPLEVEL );
page = gtk_drawing_area_new( );
dpage = GTK_DRAWING_AREA( page );
gtk_widget_set_size_request( page, PAGE_WIDTH, PAGE_HEIGHT );
gc = gdk_gc_new( GTK_DRAWABLE( dpage ) );

gtk_widget_show( window );
gtk_main();

return (EXIT_SUCCESS);

}

my dpage is apparently not a 'drawable' (though it is a drawing area). I am confused as to a) how do I get/create the graphics context which is required in subsequent function calls?
b) am I close to a solution, or am I so completely *#&@& wrong that there is no hope
c) a baby steps tutorial. (I started with hello world as my base, so I got that far).

any and all help appreciated.

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