worked on rendering code

worked on code for libgui for rendering a user interface

src/user/lib/libgui/libgui_core.rs

@@ -0,0 +1,274 @@
+use crate::std::io::Frame;
+use alloc::{vec::Vec, vec, boxed::Box, string::ToString};
+use crate::kernel::render::{BUFFER_WIDTH, BUFFER_HEIGHT, RENDERER};
+use crate::{println, print};
+/*
+
+- this library will provide useful structures for creating simple
+  command line based interfaces using ascii
+
+*/
+
+
+
+/// all interface elements must implement this trait in order to be
+/// rendered on the screen
+trait Element { // default behaviour for all elements
+    
+    fn render(&self) -> (Vec<Vec<char>>, (usize, usize)) { // recursive method for rendering the 
+                       // specified frame to the screen
+        // insert rendering code for specific frame here
+        // this should also render all children of the element
+        (Vec::<Vec<char>>::new(), (0, 0))
+    }
+    
+}
+
+
+
+pub struct Container { // a simple container objects for grouping
+                       // other containers together
+    frame: Vec<Vec<char>>,
+    elements: Vec<Box<dyn Element>>,
+    position: (usize, usize), // x,y
+    //
+    outlined: bool,
+    dimensions: (usize, usize), // x,y
+}
+
+impl Container {
+    
+    fn new(position: (usize, usize), dimensions: (usize, usize), outlined: bool) -> Container {
+        Self { 
+            frame: vec![vec![' '; dimensions.0 as usize]; dimensions.1 as usize],
+            elements: Vec::new(),
+            position,
+            outlined,
+            dimensions,
+        }
+    }
+    fn place(&self, element: Vec<Vec<char>>) {
+        return // unimplemented
+    }
+    
+}
+
+impl Element for Container {
+
+    fn render(&self) -> (Vec<Vec<char>>, (usize, usize)) { // returns all elements as a single frame
+
+        let mut charmap = Vec::<Vec<char>>::new();
+
+        let mut frstline: Vec<char>;
+        let mut midlines: Vec<char>;
+        let mut lastline: Vec<char>;
+
+
+        if self.outlined {
+            frstline = vec!['┌'];
+            midlines = vec!['│'];
+            lastline = vec!['└'];
+
+            frstline.append(&mut vec!['─'; self.dimensions.0 -2]);
+            midlines.append(&mut vec![' '; self.dimensions.0 -2]);
+            lastline.append(&mut vec!['─'; self.dimensions.0 -2]);
+                    
+            frstline.append(&mut vec!['┐']);
+            midlines.append(&mut vec!['│']);
+            lastline.append(&mut vec!['┘']);
+        
+        
+            charmap.push(frstline);
+            for _ in 0..self.dimensions.1 -2 {
+                charmap.push(midlines.clone());
+            }
+            charmap.push(lastline);
+        
+        }
+        
+        // render child elements
+        
+        for element in &self.elements {
+            let r = (*element).render();
+            
+            // rendering code for child elements goes here
+
+
+            // code to render the object at the position marked by offset within the container
+
+        
+            for (i, row) in r.0.iter().enumerate() {
+                for (j, chr) in row.iter().enumerate() {             // r.0 is the rendered element
+                                                                     // r.1.0 is the x offset
+                    charmap[i + r.1.1][j + r.1.0] = *chr;         // r.1.1 is the y offset
+                }                                           
+            }
+        }
+        
+        return (charmap, self.position);
+        
+    }
+}
+
+
+
+pub struct IndicatorBar {
+    length: usize,
+    filled: usize,
+    abs: usize,
+    position: (usize, usize),
+}
+
+impl IndicatorBar {
+    fn new(position: (usize, usize), length: usize) -> IndicatorBar {
+        IndicatorBar { position, length, abs: 0, filled: 0 }
+    }
+    fn set_value(&mut self, value: usize) { // takes a value from 1-100% 
+        // and turns it into a corresponding length filled
+        self.filled = value
+    }
+}
+
+impl Element for IndicatorBar {
+    fn render(&self) -> (Vec<Vec<char>>, (usize, usize)) {
+        let numlen = (self.abs.to_string().as_str()).len();
+        let relfilled = (self.filled as f64 / 100.0 * ((self.length - numlen) as f64)) as usize;
+        
+        let mut line = Vec::<char>::new();
+        line.append(&mut (self.abs.to_string().chars().collect()));
+        line.append(&mut vec!['▓'; relfilled]);
+        line.append(&mut vec!['░'; self.length-numlen-relfilled]);
+
+
+        let mut rendered = Vec::new();
+        rendered.push(line);
+
+
+        println!("RENDERED: {:?}", rendered);
+        
+        return (rendered, (self.position))
+    }
+}
+
+
+
+
+
+
+
+// functions that deal with the rendering and interaction between objects being
+// rendered.
+
+pub fn render_frame(elements: Vec<Container>) {
+    let mut buffer: Frame = [[' '; BUFFER_WIDTH]; BUFFER_HEIGHT];
+    
+    for frame in elements.iter() {
+
+        let f = frame.render();
+        
+        for (i, row) in f.0.iter().enumerate() {
+            for (j, chr) in row.iter().enumerate() {
+                let mut current = &buffer[i + f.1.1][j + f.1.0];
+                let newchar = overlap_check(*current, *chr);
+                buffer[i + f.1.1][j + f.1.0] = newchar;
+                
+                //print!("{}", buffer[i+frame.position.1][j+frame.position.0]);
+            }
+        }
+        
+    }
+    
+    //println!("{:?}", buffer);
+    
+    RENDERER.lock().render_frame(buffer)
+}
+
+pub fn overlap_check(oldchar: char, newchar: char) -> char {
+    match (oldchar, newchar) {
+        //┌│└ ┐┘─    
+        ('│', '─')|('┌', '┘')|('└', '┐') => '┼',
+        ('┌', '└') => '├',
+        ('┐', '┐') => '┤',
+
+        (_, _) => newchar
+    }
+}
+
+// function to return a charmap of the outline of an object
+
+fn gen_outline(dimensions: (usize, usize)) -> Vec<Vec<char>> {
+    let mut charmap = Vec::<Vec<char>>::new();
+    
+    let mut frstline = vec!['┌'];
+    let mut midlines = vec!['│'];
+    let mut lastline = vec!['└'];
+
+    frstline.append(&mut vec!['─'; dimensions.0 -2]);
+    midlines.append(&mut vec![' '; dimensions.0 -2]);
+    lastline.append(&mut vec!['─'; dimensions.0 -2]);
+                    
+    frstline.append(&mut vec!['┐']);
+    midlines.append(&mut vec!['│']);
+    lastline.append(&mut vec!['┘']);
+        
+        
+    charmap.push(frstline);
+    for _ in 0..dimensions.1 -2 {
+        charmap.push(midlines.clone());
+    }
+    charmap.push(lastline);
+
+    return charmap
+}
+
+
+
+
+
+
+
+
+
+
+
+
+// testing functions
+
+pub fn test_elements() {
+    println!("e");
+
+    let mut containers = Vec::<Container>::new();
+
+    //for _ in 0..10 {
+    //    containers.push(generate_box());
+    //}
+
+    containers.push(Container::new((5, 5), (15, 5), true));
+    containers.push(Container::new((10, 3), (50, 15), true));
+
+    let mut bar = IndicatorBar::new((10, 10), 12);
+    let mut bar2 = IndicatorBar::new((10, 11), 12);
+    
+    
+    bar.set_value(43);
+    bar.abs = 101;
+    bar2.set_value(14);
+    bar2.abs= 15;
+    containers[1].elements.push(Box::new(bar));
+    containers[1].elements.push(Box::new(bar2));
+    
+    
+    render_frame(containers);
+    return 
+}
+
+// function to generate a box in a random location on the screen.
+
+fn generate_box() -> Container {
+    use crate::std::random::Random;
+    let width = Random::int(5, 20);
+    let height = Random::int(5, 10);
+    let xoffset = Random::int(5, 50);
+    let yoffset = Random::int(5, 10);
+    Container::new((width, height), (xoffset, yoffset), true)
+}

src/user/lib/libgui/mod.rs

@@ -0,0 +1,2 @@
+pub mod libgui_core;
+pub mod libgui_elements;