We know that a point (x, y) maps onto (-x, y) when reflected in the y-axis. Solved example to find the reflection of a point in the y-axis:įind the points onto which the points (11, -8), (-6, -2) and (0, 4) are mapped when reflected in the y-axis. (iv) The image of the point (-6, 5) in the y-axis is the point (-(-6), 5) i.e., (6, 5). (iii) The image of the point (0, 7) in the y-axis is the point (0, 7). This a great resource to differentiate your lesson/math centers, because EACH picture has a different level of difficulty One picture (the alien/robot) just has students reflect over the y. (i) The image of the point (3, 4) in the y-axis is the point (-3, 4). Here is a collection of three graph art pictures for older students that allow them to practice reflecting points over the x and y axis to create a picture.
Therefore, when a point is reflected in the y-axis, the sign of its abscissa changes. So, image equation of the given equation is x 2y2.
If negative angles don't work then use (360-angle). Therefore, the reverse angle will be -angle. If the angle of 0 has the cannon pointing straight up, then the angle is measured from straight up, clockwise. The calculation depends on which direction 0 is, and whether the angles run clockwise or anticlockwise. It sounds like your cannon is viewed from the side, and you are wanting it to turn around from right to left but keeping the cannon facing up. This is quite tricky to answer without knowing a bit more about how the cannons are defined in your game, but I'll try to give some pointers. Anyone would be so kind to help me with this? I want something that is aiming with an angle of 91 to turn into 89 when reversed. To put it in other words, I work in 2D, so I want an angle that is facing right to face left.
So, I need to do something else, but it escapes my knowledge. How do you mirror a function about the y-axis Reflect Function About y-Axis: f(-x) Expii. When the robot changes from facing right to facing left, I do (180 - angle) as everyone suggested me, but it literally reverses the angle, making the cannons aim up when they are aiming down. The rule for a reflection over the y -axis is (x,y)(x,y). I basically want to reverse the direction of cannon objects adhered to a robot. If we reflect in the y axis, then the x values become -x, and the line becomes ya(-x)+b, which is y-ax+b. One image says more than 1000 words though (specially uneducated words):
Reflection across y axis how to#
Having never studied anything beyond basic math, I have a lot of trouble figuring out how to reverse the angle of something, facing to the opposite direction, along the X axis & across the Y axis. I am no mathematician, but I somehow got into game development as a hobby.