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function scale_text_delta(template, delta)
template = template.slide
for i = 1, #template do
local paint = template[i].paint
paint:setTextSize(paint:getTextSize() + delta)
end
end
function slide_transition(prev, next, is_forward)
local rec = {
proc = function(self, canvas, drawSlideProc)
if self:isDone() then
drawSlideProc(canvas)
return nil
end
self.prevDrawable:draw(canvas, self.curr_x, 0)
self.nextDrawable:draw(canvas, self.curr_x + 640, 0)
self.curr_x = self.curr_x + self.step_x
return self
end
}
if is_forward then
rec.prevDrawable = prev
rec.nextDrawable = next
rec.curr_x = 0
rec.step_x = -15
rec.isDone = function (self) return self.curr_x <= -640 end
else
rec.prevDrawable = next
rec.nextDrawable = prev
rec.curr_x = -640
rec.step_x = 15
rec.isDone = function (self) return self.curr_x >= 0 end
end
return rec
end
function sqr(value) return value * value end
function set_blur(paint, alpha)
local sigma = sqr(1 - alpha) * 20
if gUseBlurInTransitions then
paint:setImageFilter(Sk.newBlurImageFilter(sigma, sigma))
end
paint:setAlpha(alpha)
end
function fade_slide_transition(prev, next, is_forward)
local rec = {
paint = Sk.newPaint(),
prevDrawable = prev,
nextDrawable = next,
proc = function(self, canvas, drawSlideProc)
if self:isDone() then
drawSlideProc(canvas)
return nil
end
set_blur(self.paint, self.prev_a)
self.prevDrawable:draw(canvas, self.prev_x, 0, self.paint)
set_blur(self.paint, self.next_a)
self.nextDrawable:draw(canvas, self.next_x, 0, self.paint)
self:step()
return self
end
}
if is_forward then
rec.prev_x = 0
rec.prev_a = 1
rec.next_x = 640
rec.next_a = 0
rec.isDone = function (self) return self.next_x <= 0 end
rec.step = function (self)
self.next_x = self.next_x - 20
self.next_a = (640 - self.next_x) / 640
self.prev_a = 1 - self.next_a
end
else
rec.prev_x = 0
rec.prev_a = 1
rec.next_x = 0
rec.next_a = 0
rec.isDone = function (self) return self.prev_x >= 640 end
rec.step = function (self)
self.prev_x = self.prev_x + 20
self.prev_a = (640 - self.prev_x) / 640
self.next_a = 1 - self.prev_a
end
end
return rec
end
function fade_transition(prev, next, is_forward)
local rec = {
paint = Sk.newPaint(),
prevDrawable = prev,
nextDrawable = next,
proc = function(self, canvas, drawSlideProc)
if self:isDone() then
drawSlideProc(canvas)
return nil
end
set_blur(self.paint, self.prev_a)
self.prevDrawable:draw(canvas, 0, 0, self.paint)
set_blur(self.paint, self.next_a)
self.nextDrawable:draw(canvas, 0, 0, self.paint)
self:step()
return self
end
}
rec.prev_a = 1
rec.next_a = 0
rec.isDone = function (self) return self.next_a >= 1 end
rec.step = function (self)
self.prev_a = math.max(self.prev_a - 0.025, 0)
self.next_a = 1 - self.prev_a
end
return rec
end
function rotate_transition(prev, next, is_forward)
local rec = {
angle = 0,
prevDrawable = prev,
nextDrawable = next,
activeDrawable = prev,
proc = function(self, canvas, drawSlideProc)
if self:isDone() then
drawSlideProc(canvas)
return nil
end
canvas:save()
canvas:translate(320, 240)
canvas:rotate(self.angle)
canvas:translate(-320, -240)
self.activeDrawable:draw(canvas, 0, 0)
self:step()
return self
end,
isDone = function (self) return self.angle >= 360 or self.angle <= -360 end
}
if is_forward then
rec.step = function (self)
self.angle = self.angle + 10
if self.angle >= 180 then
self.activeDrawable = self.nextDrawable
end
end
else
rec.step = function (self)
self.angle = self.angle - 10
if self.angle <= -180 then
self.activeDrawable = self.nextDrawable
end
end
end
return rec
end
function zoom_transition(prev, next, is_forward)
local rec = {
scale = 1,
scale_delta = .95,
scale_limit = 0.2,
pivot_x = 320,
pivot_y = 240,
prevDrawable = prev,
nextDrawable = next,
activeDrawable = prev,
proc = function(self, canvas, drawSlideProc)
if self:isDone() then
drawSlideProc(canvas)
return nil
end
canvas:translate(self.pivot_x, self.pivot_y)
canvas:scale(self.scale, self.scale)
canvas:translate(-self.pivot_x, -self.pivot_y)
self.activeDrawable:draw(canvas, 0, 0)
self:step()
return self
end,
isDone = function (self) return self.scale > 1 end,
step = function (self)
if self.scale < self.scale_limit then
self.scale = self.scale_limit
self.scale_delta = 1 / self.scale_delta
self.activeDrawable = self.nextDrawable
end
self.scale = self.scale * self.scale_delta
end
}
return rec
end
gTransitionTable = {
fade = fade_transition,
slide = slide_transition,
fade_slide = fade_slide_transition,
rotate = rotate_transition,
zoom = zoom_transition,
}
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