break transitions into separate file
BUG=skia:
TBR=
NOTRY=True
Review URL: https://codereview.chromium.org/692543004
diff --git a/resources/slides_transitions.lua b/resources/slides_transitions.lua
new file mode 100644
index 0000000..4a838a4
--- /dev/null
+++ b/resources/slides_transitions.lua
@@ -0,0 +1,206 @@
+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
+-- paint:setImageFilter(Sk.newBlurImageFilter(sigma, sigma))
+ 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,
+}
+