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some work on arrows

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This commit is contained in:
Mikhail Koltsov 2014-03-23 20:21:11 +04:00
parent fd2d9b6833
commit edeeb3c3eb
1 changed files with 20 additions and 3 deletions
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23
app/lib/surface/CocoSprite.coffee
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@ -255,9 +255,7 @@ module.exports = CocoSprite = class CocoSprite extends CocoClass
if @thangType.get('name') is 'Arrow'
# scale the arrow so it appears longer when flying parallel to horizon
angle = @getRotation()
angle = -angle if angle < 0
angle = 180 - angle if angle > 90
scaleX = 0.5 + 0.5 * (90 - angle) / 90
scaleX = 0.5 + 0.5 * angleDiffFactorFrom90(angle)
scaleFactorX = @thang.scaleFactorX ? @scaleFactor
scaleFactorY = @thang.scaleFactorY ? @scaleFactor
@imageObject.scaleX = @originalScaleX * scaleX * scaleFactorX
@ -275,10 +273,29 @@ module.exports = CocoSprite = class CocoSprite extends CocoClass
if @options.showInvisible
@imageObject.alpha = Math.max 0.5, @imageObject.alpha
angleDiffFactorFrom90: (angle) ->
# how much horizontal is angle, which must be (-180, 180].
# 1 for parallel to horizon, 0 for orthogonal, monotonuous in between
angle = -angle if angle < 0
angle = 180 - angle if angle > 90
return (90 - angle) / 90
updateRotation: (imageObject) ->
rotationType = @thangType.get('rotationType')
return if rotationType is 'fixed'
rotation = @getRotation()
if False and @thangType.get('name') is 'Arrow'
# Makes arrow rotate properly when travelling upwards or downwards with z-coordinate.
# If it's travelling parallel to horizon, then the arc must be more visible.
# But when it's perpendicular, the arrow must be scaled, not rotated, to pretend
# it is getting closer to the camera.
velocity = @thang.velocity.z
originallyHeaded = 360 - @thang.initialRotation / Math.PI * 180
originallyHeaded -= 360 if originallyHeaded > 180
angleFactor = angleDiffFactorFrom90(originallyHeaded) # the more it is, the more deviation from original direction
speedLimit = 7 # for normalization purposes
velocityFactor = velocity / speedLimit # same as angleFactor
rotation = originallyHeaded + velocityFactor * angleFactor * 45
imageObject ?= @imageObject
return imageObject.rotation = rotation if not rotationType
@updateIsometricRotation(rotation, imageObject)