export function drawLine()

in libs/screen/sim/image.ts [443:525]

• 75 lines of code
• 21 McCabe index (conditional complexity)

    export function drawLine(img: RefImage, x0: number, y0: number, x1: number, y1: number, c: number) {
        x0 |= 0
        y0 |= 0
        x1 |= 0
        y1 |= 0

        if (x1 < x0) {
            drawLine(img, x1, y1, x0, y0, c);
            return;
        }

        let w = x1 - x0;
        let h = y1 - y0;

        if (h == 0) {
            if (w == 0)
                setPixel(img, x0, y0, c);
            else
                fillRect(img, x0, y0, w + 1, 1, c);
            return;
        }

        if (w == 0) {
            if (h > 0)
                fillRect(img, x0, y0, 1, h + 1, c);
            else
                fillRect(img, x0, y1, 1, -h + 1, c);
            return;
        }

        if (x1 < 0 || x0 >= img._width)
            return;
        if (x0 < 0) {
            y0 -= (h * x0 / w) | 0;
            x0 = 0;
        }
        if (x1 >= img._width) {
            let d = (img._width - 1) - x1;
            y1 += (h * d / w) | 0;
            x1 = img._width - 1
        }

        if (y0 < y1) {
            if (y0 >= img._height || y1 < 0)
                return;
            if (y0 < 0) {
                x0 -= (w * y0 / h) | 0;
                y0 = 0;
            }
            if (y1 >= img._height) {
                let d = (img._height - 1) - y1;
                x1 += (w * d / h) | 0;
                y1 = img._height
            }
        } else {
            if (y1 >= img._height || y0 < 0)
                return;
            if (y1 < 0) {
                x1 -= (w * y1 / h) | 0;
                y1 = 0;
            }
            if (y0 >= img._height) {
                let d = (img._height - 1) - y0;
                x0 += (w * d / h) | 0;
                y0 = img._height
            }
        }

        img.makeWritable()

        if (h < 0) {
            h = -h;
            if (h < w)
                drawLineLow(img, x0, y0, x1, y1, c);
            else
                drawLineHigh(img, x1, y1, x0, y0, c);
        } else {
            if (h < w)
                drawLineLow(img, x0, y0, x1, y1, c);
            else
                drawLineHigh(img, x0, y0, x1, y1, c);
        }
    }