Questions tagged [trigonometry]

A branch of mathematics that studies triangles and the relationships between their sides and the angles between these sides.

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4
votes
3answers
151 views

Propel entities at some angle (depending on explosion's position)

I have a 2D platformer. There are multiple particles that are just 1x1 colored pixels. Let's assume there are 256 particles laid out as a 16x16 cube. Say I popped an explosion right in the middle. All ...
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1answer
108 views

Get rotate angle using a formula

I am developing a game that is being played on a board with the top first tile having the coordinates [0,0], the next one has [0,1], second row has [1,0]... and so on (most likely this would be a ...
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2answers
495 views

Bullet entry Point around Player Object

I have a player rotating by the mouse and want the bullets line up with the player's gun. Right now they simply come from the point of the player and shoot in the direction of mouse. I just need the ...
0
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1answer
179 views

"Walking" along a rotating surface in LimeJS

I'm trying to have a character walk along a plank (a long, thin rectangle) that works like a seesaw, being rotated around a central point by box2d physics (falling objects). I want the left and right ...
0
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2answers
164 views

Need to use trig to make a ship point in the right direction

I'm making a 2D spaceship-shooter game that moves in all directions, (i.e. ( -x, +x ),( -y, +y ) ). I'm trying to make the spaceship face the direction of the movement according to a virtual joystick....
2
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2answers
1k views

Asteroids Movement

I have been making an asteroids clone, in C#. However, the ship's movement is... not quite right. My plan is this: there is a speed, and two directions, namely the direction the ship is facing (...
1
vote
1answer
182 views

Using circles to create a sphere

I've been working on creating spheres in a 3D space recently, and have successfully created cylinders. I've just run into a little problem. For some reason, my "Spheres" end up looking like very thick ...
0
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1answer
951 views

getting direction of x and y... north,south,east,west

I have a player in the center of the screen, where I also have my mouse position origin. (0,0) I would like to know the direction of the mouse, imagine splitting the screen with a X, so the top ...
0
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1answer
381 views

Points around a circumference C#

Im trying to get a list of vectors that go around a circle, but i keep getting the circle to go around several times. I want one circel and the dots to be placed along its circumference. I want the ...
7
votes
1answer
9k views

Raycasting "fisheye effect" question

Continuing my exploration of raycasting, I am very confused about how the correction of the fisheye effect works. Looking at the screenshot below from the tutorial at permadi.com, the way I ...
7
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1answer
3k views

Spherical to Cartesian Coordinates

Well I'm reading the Frank's Luna DirectX10 book and, while I'm trying to understand the first demo, I found something that's not very clear at least for me. In the updateScene method, when I press A, ...
8
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2answers
14k views

How to rotate camera centered around the camera's position?

Currently I am using gluLook at like so: ...
14
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3answers
23k views

How do I make an entity move in a direction?

I have an Entity instance which is updated every game tick. Let's just assume that entity moves forward constantly. I'd like to be able to give the entity's angle ...
0
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1answer
2k views

Calculate the angle between two 3d vectors: Function always returns 89.1-89.9

I have my own 2d game and I am attempting to calculate the angle between 2 GameObjects. My Problem: My function that is meant to calculate the angle(direction) between 2 Vector3's doesn't appear to ...
0
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3answers
2k views

Game Institute Math Courses

I'm 21 years old and I suck at math, I mean really bad. I don't have the necessary logic to apply it towards programming. I would like to learn the math and logic of applying it. I found Game ...
1
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0answers
369 views

What is the connection between an isometric angle and scale

I am trying to work out an isometric projection matrix for a custom angle. In the engine I'm using there's a projection matrix defined like so: ...
0
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1answer
358 views

Minimap Around Perimeter of Screen, Code Provided

What I'm essentially trying to do is what a lot of FPS's nowadays do in regards to their HUD. When an objective is off-screen, a small icon / symbol is shown on the perimeter of the screen, basically ...
12
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1answer
2k views

How can I draw an arrow at the edge of the screen pointing to an object that is off screen?

I am wishing to do what is described in this topic: http://www.allegro.cc/forums/print-thread/283220 I have attempted a variety of the methods mentioned here. First I tried to use the method ...
5
votes
5answers
10k views

How to detect if object is moving in clockwise- or counterclockwise direction?

I've read this one, but I need more info: rotating an object from sourceAngle to destAngle, both 0-359, clockwise or counter clockwise? I have a ball. The user is able to drag the ball in any ...
13
votes
2answers
16k views

How do I generate projectiles toward the mouse pointer? [duplicate]

I'm making a top-down space shooter where the player controls a ship and can aim and shoot using the mouse cursor. How can I fire bullets from the ship at the angle from the ship to the mouse cursor?

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