问DukTape在过剩窗口上显示JavaScript画布

EN

// C/C++ code:
// C function to be used in the Javascript engine 
int js_draw_rect(duk_context *ctx) {
    // get parameters from javascript function call
    int pos_x = duk_get_number(ctx, -4);
    int pos_y = duk_get_number(ctx, -3);
    ...

    // C/C++ code to draw the rectangle (in your case probably GLUT)
    draw_rectangle(pos_x, pos_y, ...);
    return 0;
}

int main(void) {
    duk_context *ctx;
    ...

    // this snippet adds a binding for the function 'js_draw_rect' so it can be called from Javascript code
    duk_push_global_object(ctx);
    duk_push_c_function(ctx, js_draw_rect, 4/*number of args the JS function has*/);
    duk_put_prop_string(ctx, -2 /*idx:global*/, "drawRect"/*name of function in JS environment*/);
    duk_pop(ctx);
}

// Javascript code:
drawRect(50, 50, 100, 200);
...