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For beginners, the code using basic function in Codea without tween().
Every line with comment -- using my poor English...
Xcode project file:
http://pan.baidu.com/s/1eQowhRs
code:
-- main
-- Use this function to perform your initial setup
function setup()
displayMode(FULLSCREEN)
x = WIDTH/2
y = HEIGHT/2
img = sprite("Cargo Bot:Starry Background")
-- 第一只 mesh 鸟 -- The 1st mesh bird
myMeshBird1 = mesh()
-- 第二只 mesh 鸟 -- The 2nd mesh bird
myMeshBird2 = mesh()
myMeshBird2.texCoords = {vec2(0,0),vec2(0,1),vec2(1,1),vec2(0,0),vec2(1,1),vec2(1,0)}
myMeshBird2.texture = img
-- 第三只 mesh 鸟 -- The 3rd mesh bird
myMeshBird3 = mesh()
-- 用于控制循环的变量 -- variable for loop control
i, j = 0, 0
k = 1
m, n = 1000, 1
a, b = 255, 1
parameter.integer("i",0,150,0)
parameter.integer("j",0,150,0)
parameter.integer("k",-1,1,1)
parameter.integer("m",0,2000,1000)
parameter.integer("n",-5,5,1)
parameter.integer("a",0,255,255)
parameter.integer("b",-1,1,1)
parameter.integer("l1",100,300,200)
parameter.integer("h1",100,300,200)
parameter.integer("l2",10,200,60)
parameter.integer("h2",0,100,10)
-- 三只对象实例鸟 -- Three object instance birds
myBird1 = Bird(x,y)
myBird2 = Bird(x+50,y)
myBird3 = Bird(x,y)
end
-- This function gets called once every frame
function draw()
-- 用来设置颜色渐变效果 -- Color alpha control
-- Alpha channel has a maximum of 255
local alpha = math.min(ElapsedTime * 20%255, 255)
-- Set tint using tint(grey, alpha)
tint(255,alpha)
-- 用 tint() 函数控制色彩透明度变化 -- Use tint()
if alpha == 255 then
tint(0,alpha)
elseif alpha == 50 then
tint(255,alpha)
end
-- 控制翅膀坐标变化 -- control change of wings' coords
-- 若 i 达到最大值,则把步长 k 设置为 -1,i + k 值会递减
-- when i become max, set step k to -1, i+k will decrease
-- 若 i 达到最小值,则把步长 k 设置为 1,i + k 值会递增
-- when i become min, set step k to 1, i+k will increase
-- 当 i 最大时调用声音,以保证声音和动作同步
-- load sound while i become max , to make sure sound and motion synchronize
if i == 150 then
k = -1
sound("A Hero's Quest:Walk 2 (Short)")
elseif i == 0 then
k = 1
end
-- 控制缩放 -- contrl scale
if m == 1500 then n = -1 elseif m == 0 then n = 1 end
-- 用变量 a,b 直接控制色彩透明度变化
-- use variable a,b to control change of color's alpha directly
if a == 255 then b = -1 elseif a == 50 then b = 1 end
-- 开始递增或递减 -- start increase or decrease
i = i + 5 * k
j = j + 8 * k
m = m + 2 * n
a = a + b
-- 设置背景色 -- set background color
background(11, 11, 10, 86)
-- 设置背景参照物 -- set background object
pushStyle()
pushMatrix()
-- scale(m/500,m/500)
-- translate(-m,m)
fill(255, 0, 0, alpha)
stroke(255, 118, 0, alpha)
ellipse(500,1250-m,m-350)
popMatrix()
popStyle()
-- 用于三只 mesh 鸟的颜色 -- colors of three mesh birds
myColor1 = color(255, 255, 0, alpha)
myColor2 = color(79, 255, 0, a)
myColor3 = color(79, 2, 100, a)
-- 构成飞鸟线条的顶点坐标 -- vertex coords of bird line
-- vec2 向量 p1(0,0) 为中心点提供坐标 -- vec(0,0) is the central point
p1 = vec2(0,0)
-- 组成右边翅膀的顶点 -- vertices of right wing
-- p2, p3 = vec2(200+i/8,-150+2*j),vec2(60-i/3,10+j/3)
p2, p3 = vec2(l1+i/8,-150+2*j),vec2(l2-i/3,h2+j/3)
-- 组成左边翅膀的顶点 -- vertices of left wing
-- p4, p5 = vec2(-200-i/8,-150+2*j),vec2(-60+i/3,10+j/3)
p4, p5 = vec2(-200-i/8,-150+2*j),vec2(-60+i/3,10+j/3)
-- 用这些坐标设置 mesh 的顶点 -- set mesh vertices
myMeshBird1.vertices = {p1, p2, p3, p1, p4, p5}
myMeshBird2.vertices = {p1, p2, p3, p1, p4, p5}
myMeshBird3.vertices = {p1, p2, p3, p1, p4, p5}
-- 平移
translate(3*x/4,3*y/4)
-- 整体循环缩放全部飞鸟比例,产生鸟群距离变化的感觉
-- total birds loop scale, to feel birds distance changing
scale(m/1500)
-- 直接用 line() 函数画的飞鸟 -- use line() draw bird directly
pushMatrix()
pushStyle()
translate(x/2,y)
scale(3)
stroke(0, 39, 255, 255)
strokeWidth(5)
-- 右边翅膀线条 -- lines of right wing
line(p1[1],p1[2],p2[1],p2[2])
line(p1[1],p1[2],p3[1],p3[2])
line(p3[1],p3[2],p2[1],p2[2])
-- 左边翅膀线条 -- lines of right wing
line(p1[1],p1[2],p4[1],p4[2])
line(p1[1],p1[2],p5[1],p5[2])
line(p4[1],p4[2],p5[1],p5[2])
-- 用文字标出飞鸟的编号 -- print bird's No.
fill(0, 51, 255, 255)
-- text("零号鸟",p1[1],p1[2])
text("1",p1[1],p1[2])
popStyle()
popMatrix()
-- 用 class Bird 绘制的对象实例鸟 -- object instance bird drawing with class Bird
pushMatrix()
pushStyle()
-- myBird.deltaX = myBird.deltaX + 5*k
-- myBird.deltaY = myBird.deltaY + 5*k
rotate(m)
scale(0.2)
myBird1:setColors(myColor)
myBird1:draw()
popStyle()
popMatrix()
-- 用 class Bird 绘制的对象实例鸟 -- object instance bird drawing with class Bird
pushMatrix()
pushStyle()
rotate(-m)
scale(0.3)
myBird2:setColors(myColor)
myBird2:draw()
popStyle()
popMatrix()
-- 用 class Bird 绘制的对象实例鸟 -- object instance bird drawing with class Bird
pushMatrix()
pushStyle()
rotate(-m)
scale(0.3)
myBird3:setColors(myColor2)
myBird3:draw()
popStyle()
popMatrix()
-- 用 mesh 绘制的一号飞鸟 -- No.1 mesh bird
pushMatrix()
pushStyle()
translate(-x/4,-y/2)
scale(.8)
myMeshBird1:setColors(myColor1)
-- myMeshBird1.shader.time = ElapsedTime*5
myMeshBird1:draw()
-- 用文字标出飞鸟的编号 -- print bird's No.
fill(173, 255, 0, 255)
-- text("一号鸟",p1[1],p1[2])
text("1",p1[1],p1[2])
popStyle()
popMatrix()
-- 用 mesh 绘制的二号飞鸟 -- No.1 mesh bird
pushMatrix()
pushStyle()
translate(300,200)
scale(.5)
myMeshBird2:setColors(myColor2)
myMeshBird2:draw()
-- 用文字标出飞鸟的编号 -- print bird's No.
fill(63, 218, 26, 255)
-- text("二号鸟",p1[1],p1[2])
text("2",p1[1],p1[2])
popStyle()
popMatrix()
-- 用 mesh 绘制的三号飞鸟 -- No.1 mesh bird
pushMatrix()
pushStyle()
translate(30,80)
scale(2)
myMeshBird3:setColors(myColor3)
myMeshBird3:draw()
-- 用文字标出飞鸟的编号 -- print bird's No.
fill(218, 25, 197, 255)
-- text("三号鸟",p1[1],p1[2])
text("3",p1[1],p1[2])
popStyle()
popMatrix()
end
-- Bird class
Bird = class()
function Bird:init(x,y)
-- you can accept and set parameters here
-- 最初的位置坐标 -- bird's position
self.x = x
self.y = y
-- 最初的坐标偏移量 -- bird's offset
self.deltaX = 0
self.deltaY = 0
self.i1, self.j1 = 0, 0
self.k1 = 1
flag = mesh()
myColor = color(55, 172, 172, 255)
Bird:setColors(myColor)
end
function Bird:draw()
-- Codea does not automatically call this method
if self.i1 == 150 then
self.k1 = -1
elseif i == 0 then
self.k1 = 1
end
self.i1 = self.i1 + 5 * self.k1
self.j1 = self.j1 + 8 * self.k1
self.deltaX = self.i1
self.deltaY = self.j1
flag.vertices = {
vec2(self.x,self.y),
vec2(self.x + 200 - self.deltaX/8, self.y - 150 + self.deltaY * 2),
vec2(self.x + 60 - self.deltaX/3, self.y + 10+self.deltaY/3),
vec2(self.x,self.y),
vec2(self.x - 200 + self.deltaX/8, self.y - 150 + self.deltaY * 2),
vec2(self.x - 60 + self.deltaX/3, self.y + 10 + self.deltaY/3),
}
-- Bird:setColors(myColor)
fill(24, 218, 201, 255)
-- text("对象鸟",self.x,self.y)
text("Object Instance Bird",self.x,self.y)
flag:draw()
end
function Bird:setColors(colors)
flag:setColors(colors)
end
function Bird:touched(touch)
-- Codea does not automatically call this method
end
Comments
@binaryblues - don't worry about your English, we have lots of members all around the world, and we know it is hard to program in a different language.
It is pretty, and you obviously have programmed before!
I have one idea for you, which is to put myBird1, myBird2 and myBird3 in a table, which means much less code. I wrote about it here
http://coolcodea.wordpress.com/2014/10/01/169-why-tables-and-classes-are-so-useful/
@Ignatz - thanks for your suggestion, I will read and study it.
(%)
nice.
@Jmv38
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