positionOnLineX+deltaX, positionOnLineY+deltaY,
arrowLength, arrowWidth, &tip_x, &tip_y,
&side1_x, &side1_y, &side2_x, &side2_y);
positionOnLineX+deltaX, positionOnLineY+deltaY,
arrowLength, arrowWidth, &tip_x, &tip_y,
&side1_x, &side1_y, &side2_x, &side2_y);