immo 0.1.0

Processing of various images (e.g., drawing of square systems)
Documentation 
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use crate::error::{ErrorKind, ImageError, ImageType};

pub struct Png(Vec<u8>, u32, u32);

impl Png {
    pub fn new(width: u32, height: u32) -> Self {
        let mut data = vec![];
        for _i in 0..width * height {
            data.push(0);
            data.push(0);
            data.push(0);
            data.push(0);
        }
        Self {
            0: data,
            1: width,
            2: height,
        }
    }

    pub fn clear(&mut self, color: (u8, u8, u8, u8)) {
        let mut data = vec![];
        for _ in 0..self.1 * self.2 {
            data.push(color.0);
            data.push(color.1);
            data.push(color.2);
            data.push(color.3);
        }
        self.0 = data;
    }

    pub fn line(
        &mut self,
        from: (u32, u32),
        to: (u32, u32),
        thickness: u32,
        color: (u8, u8, u8, u8),
    ) -> Result<(), ImageError> {
        if from.1 == to.1 {
            // Horizontal
            self.fill_rectangle(from.0, from.1, from.0 + to.0, thickness, color)?;
        } else if from.0 == to.0 {
            // Vertical
            self.fill_rectangle(from.0, from.1, thickness, from.1 + to.1, color)?;
        } else if from.0 < to.0 {
            // Right lopsided
            let shift = to.0 - from.0;
            let mut shift_x_count = 0;
            let mut shift_y_count = 0;

            let height = (from.1 + to.1) / shift;

            for _ in 0..shift {
                self.fill_rectangle(
                    from.0 + shift_x_count,
                    from.1 + shift_y_count,
                    thickness,
                    height,
                    color,
                )?;
                shift_x_count += thickness;
                shift_y_count += height;
            }

            let actual_height = height * shift;
            if actual_height < from.1 + to.1 {
                self.fill_rectangle(
                    from.0 + shift_x_count - 1,
                    from.1 + shift_y_count,
                    thickness,
                    from.1 + to.1 - actual_height,
                    color,
                )?;
            }
        } else if to.0 < from.0 {
            // Left lopsided
        }

        Ok(())
    }

    pub fn point(&mut self, x: u32, y: u32, color: (u8, u8, u8, u8)) -> Result<(), ImageError> {
        if x >= self.1 {
            return Err(ImageError::new_simple(ErrorKind::OutOfRange(self.1 - 1, x)));
        }

        if y >= self.2 {
            return Err(ImageError::new_simple(ErrorKind::OutOfRange(self.2 - 1, y)));
        }

        let index = if x == 0 {
            (x * 4 + (y * self.2) * 4) as usize
        } else {
            (x * 4 + (y * self.2) * 4) as usize
        };

        self.0[index] = color.0;
        self.0[index + 1] = color.1;
        self.0[index + 2] = color.2;
        self.0[index + 3] = color.3;

        Ok(())
    }

    pub fn fill_rectangle(
        &mut self,
        x: u32,
        y: u32,
        width: u32,
        height: u32,
        color: (u8, u8, u8, u8),
    ) -> Result<(), ImageError> {
        let mut xc = 0;
        let mut yc = 0;

        if width == 0 || height == 0 {
            return Err(ImageError::new_simple(ErrorKind::InvalidValue(
                ImageType::Png,
            )));
        }

        let mut vec = vec![];

        for _i in 0..((self.1 * self.2) * 4) {
            if xc >= x && xc <= (width + x) {
                if yc >= y && yc <= (height + y) - 1 {
                    vec.push((xc, yc, color));
                }
            }
            xc += 1;
            if xc == self.1 * 4 {
                yc += 1;
                xc = 0;
            }
        }

        for i in vec {
            match self.point(i.0, i.1, i.2) {
                Ok(_) => {}
                Err(err) => {
                    error!("{}", err);
                }
            }
        }

        Ok(())
    }

    pub fn draw_rectangle(
        &mut self,
        x: u32,
        y: u32,
        width: u32,
        height: u32,
        thickness: u32,
        color: (u8, u8, u8, u8),
    ) -> Result<(), ImageError> {
        if width == 0 || height == 0 || thickness == 0 {
            return Err(ImageError::new_simple(ErrorKind::InvalidValue(
                ImageType::Png,
            )));
        }

        if thickness >= width {
            return Err(ImageError::new_simple(ErrorKind::InvalidValue(
                ImageType::Png,
            )));
        }

        self.fill_rectangle(x, y, width, thickness, color)?;

        self.fill_rectangle(x, y, thickness, height, color)?;

        self.fill_rectangle(x + width - thickness, y, thickness, height, color)?;

        self.fill_rectangle(x, y + height - thickness, width, thickness, color)?;

        Ok(())
    }

    pub fn as_slice(&self) -> &[u8] {
        self.0.as_slice()
    }
}