X11编程，一些问题

问题1：如何在X11窗口中绘制一个简单的矩形？

解决方法：

#include <X11/Xlib.h>

int main() {
    Display* display = XOpenDisplay(NULL);
    int screen = DefaultScreen(display);
    Window root = RootWindow(display, screen);
    Window window = XCreateSimpleWindow(display, root, 0, 0, 500, 500, 0, BlackPixel(display, screen), WhitePixel(display, screen));
    XSelectInput(display, window, ExposureMask);
    XMapWindow(display, window);
    
    while (1) {
        XEvent event;
        XNextEvent(display, &event);
        if (event.type == Expose) {
            XFillRectangle(display, window, DefaultGC(display, screen), 50, 50, 200, 100);
        }
        if (event.type == ButtonPress) {
            break;
        }
    }
    
    XDestroyWindow(display, window);
    XCloseDisplay(display);
    return 0;
}

问题2：如何在X11窗口中获取鼠标点击事件的坐标？

解决方法：

#include <X11/Xlib.h>

int main() {
    Display* display = XOpenDisplay(NULL);
    int screen = DefaultScreen(display);
    Window root = RootWindow(display, screen);
    Window window = XCreateSimpleWindow(display, root, 0, 0, 500, 500, 0, BlackPixel(display, screen), WhitePixel(display, screen));
    XSelectInput(display, window, ButtonPressMask);
    XMapWindow(display, window);
    
    while (1) {
        XEvent event;
        XNextEvent(display, &event);
        if (event.type == ButtonPress) {
            int x = event.xbutton.x;
            int y = event.xbutton.y;
            printf("Mouse clicked at (%d, %d)\n", x, y);
            break;
        }
    }
    
    XDestroyWindow(display, window);
    XCloseDisplay(display);
    return 0;
}

问题3：如何在X11窗口中显示一张图片？

解决方法：

#include <X11/Xlib.h>
#include <X11/Xutil.h>

int main() {
    Display* display = XOpenDisplay(NULL);
    int screen = DefaultScreen(display);
    Window root = RootWindow(display, screen);
    Window window = XCreateSimpleWindow(display, root, 0, 0, 500, 500, 0, BlackPixel(display, screen), WhitePixel(display, screen));
    XSelectInput(display, window, ExposureMask);
    XMapWindow(display, window);
    
    XImage* image;
    image = XCreateImage(display, CopyFromParent, DefaultDepth(display, screen), ZPixmap, 0, NULL, 500, 500, 32, 0);
    image->data = (char*)malloc(image->bytes_per_line * image->height);
    
    for (int y = 0; y < image->height; y++) {
        for (int x = 0; x < image->width; x++) {
            XPutPixel(image, x, y, 0xFF0000);
        }
    }
    
    XPutImage(display, window, DefaultGC(display, screen), image, 0, 0, 0, 0, image->width, image->height);
    XFlush(display);
    free(image->data);
    XDestroyImage(image);
    
    while (1) {
        XEvent event;
        XNextEvent(display, &event);
        if (event.type == ButtonPress) {
            break;
        }
    }
    
    XDestroyWindow(display, window);
    XCloseDisplay(display);
    return 0;
}

这些示例代码演示了如何在X11窗口中绘制矩形、获取鼠标点击事件的坐标以及显示一张图片。注意，这些代码仅为示例，可能需要根据具体的需求进行修改和调整。