DDA Line Algorithm

ddaLine.cpp

void ddaLine(float xa, float ya, float xb, float yb) {
    int dx = xb - xa, dy = yb - ya;
    int k, steps;
    float xinc, yinc, x = xa, y = ya;

    if (abs(dx) > abs(dy)) {
        steps = abs(dx);
    }
    else {
        steps = abs(dy);
    }

    xinc = (float) dx / steps;
    yinc = (float) dy / steps;

    putPixel(x, y);

    for (k = 0; k < steps; k++) {
        x += xinc;
        y += yinc;

        putPixel(x, y);
    }
}