Python的文字特效，炫酷了！

# 把每个文字与它的三个运动结合为一个基本单位

def newTextMotion(char, posFunc, sizeFunc, colorFunc):

    tm={}

    tm['char']=char

    tm['posFunc']= posFunc

    tm['sizeFunc']= sizeFunc

    tm['colorFunc']= colorFunc

    return tm

# 在指定的时间，计算文字的位置、大小、颜色等

def showText(img, textMotion, time):

    char= textMotion['char']

    pos= textMotion['posFunc'](time)

    size= textMotion['sizeFunc'](time)

    color= textMotion['colorFunc'](time)

    font= ImageFont.truetype(fontName, size)

    draw = ImageDraw.Draw(im=img)

    textSize= draw.textsize(text=char, font=font)

    tx= pos[0]- textSize[0]// 2

    ty= pos[1]- textSize[1]// 2

    draw.text(xy=(tx, ty), text=char, fill=color, font=font)

def getTextFrame(tmList, time):

    textImg= Image.new('RGBA', (1280, 720))

    for tm in tmList:

        showText(textImg, tm, time)

    return textImg

# 文字缩小

def makeTextShrink(char, toSize, toPos, toColor, offset, dur):

    def colorFunc(time):

        if time< offset:

            return (0,0,0,0)

        if time> offset+ dur:

            return toColor

        return toColor[:-1] + (50+ round((time-offset)/dur*200),)

    def sizeFunc(time):

        if time< offset:

            return toSize* 8

        if time> offset+ dur:

            return toSize

        return toSize*8 - round((time-offset)/dur* toSize*7.5)

    def posFunc(time):

        if time< offset:

            return (0,0)

        if time> offset+ dur:

            return toPos

        # return (toPos[0], round((time-offset)/dur*toPos[1]))

        return toPos

    return newTextMotion(char, posFunc, sizeFunc, colorFunc)

# 抛物线降落（有一个回弹效果）

def makeTextParaDrop(char, toSize, toPos, toColor, offset, dur):

    def colorFunc(time):

        if time< offset:

            return (0,0,0,0)

        if time> offset+ dur:

            return toColor

        return toColor[:-1] + (50+ round((time-offset)/dur*200),)

    def sizeFunc(time):

        if time< offset:

            return toSize

        if time> offset+ dur:

            return toSize

        return toSize

    def posFunc(time):

        if time< offset:

            return (toPos[0], 0)

        if time> offset+ dur:

            return toPos

        r= 0.75

        dur2= dur

        a= toPos[1]/(dur2* dur2* (1- 2* r))

        b= -2* a* dur2* r

        x= (time-offset)

        return (toPos[0], round(a* x* x+ b*x))

    # print(toPos)

    return newTextMotion(char, posFunc, sizeFunc, colorFunc)

# 一行文字，给定所有参数，配置运动函数与延时

def getMotionList(text, fontSize, fontColor, startPos, fromTime, dur, func):

    tmList=[]

    inter= round(dur/ len(text))

    for i in range(len(text)):

        char= text[i]

        pos= (startPos[0]+ i* fontSize+ 10, startPos[1])

        color= fontColor

        # tm= makeTextDropMotion(char, fontSize, pos, color, 150*i)

        tm= func(char, fontSize, pos, color, fromTime+inter*i, dur)

        tmList.append(tm)

    return tmList

def showTextDrop(text, startPos, func):

    fontSize= 50

    color=(255, 255,  0, 255)

    tmList= getMotionList(text, fontSize, color, startPos, 0, 1000, func)

    frames=[]

    outfilename='temp.gif'

    for i in range(0, 2000, 50):

        print(i)

        img= Image.new('RGB', (640, 360))

        # img= Image.open('back.png').resize((640, 360), Image.ANTIALIAS)

        # img = img.convert("RGB")  

        textImg= getTextFrame(tmList, i)

        r, g, b, a= textImg.split()

        img.paste(textImg, (0,0), mask= a)

        str1= 'tempAA.png'

        img.save(str1)

        im = imageio.imread(str1)

        frames.append(im)

    imageio.mimsave(outfilename, frames, 'GIF', duration=0.05)

if __name__=='__main__':

    # showTextDrop('淡妆浓抹总相宜', (150,200), makeTextParaDrop)

    showTextDrop('淡妆浓抹总相宜', (150,200), makeTextDropMotion)