GetEntityXForm
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(Created page with '{{PhysicsMethod| physics:getEntityXForm(entityId) | Fetches the 2D matrix that defines the entity's current position and rotation in world space. | {{MethodParam|enitityId|An int...')
(Created page with '{{PhysicsMethod| physics:getEntityXForm(entityId) | Fetches the 2D matrix that defines the entity's current position and rotation in world space. | {{MethodParam|enitityId|An int...')
Latest revision as of 12:38, 7 February 2010
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physics:getEntityXForm(entityId) | ||
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Fetches the 2D matrix that defines the entity's current position and rotation in world space. | ||
| Parameter | Expected Type | Description |
| enitityId | An integer | The entity's body identifier. |
| Returns | ||
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Returns six values. First the centerX and centerY, which is the entity's current center position in world space (measured in meters). Then four values that build up the rotation matrix: x1, y1, x2, y2. You can use these six values to determine any point on the shape. For example, say that you have x and y, which are points relative to the entity's centrum position. To calculate where x and y are right now, you do: local formX, formY, formCX1, formCY1, formCX2, formCY2 = physics:getEntityXForm(player.body) local newX = formCX1 * x + formCX2 * y local newY = formCY1 * x + formCY2 * y x, y = newX + formX, newY + formY | ||
Example
local formX, formY, formCX1, formCY1, formCX2, formCY2 = physics:getEntityXForm(player.body) local newX = formCX1 * x + formCX2 * y local newY = formCY1 * x + formCY2 * y x, y = newX + formX, newY + formY video.renderSpriteState(player.sprite, x / physResolution, y / physResolution)
