Print Graphics Between Two Points In Assembly (MASM)

Question

I am trying to write a macro in MASM which enables me to display a graphic line from one point to another but the following code i have written just goes x axis and then y axis and not a line between the two points.

printFrom macro color, from_x, from_y, to_x , to_y

    mov si, from_x
    mov di, from_y

    .while temp != 0
        mov ah, 0ch
        mov al, color
        mov cx, si
        mov dx, di
        int 10h

        .IF si < to_x && di < to_y
            inc si
            inc di
        .ELSEIF si < to_x
            inc si
        .ELSEIF di < to_y
            inc di
        .ELSE
            mov temp, 0
        .ENDIF
    .endw

    mov si, 0
    mov di, 0
    mov temp, 1

endm

Kindly help me in modifying this code.