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标题: 识别换行符的draw_text [打印本页]

作者: 无脑之人 时间: 2013-8-31 13:13
标题: 识别换行符的draw_text
本帖最后由无脑之人于 2013-10-12 21:59 编辑

简单的一个小功能而已，用在手动换行和自动换行上都很方便，有什么Bug请回复，谢谢合作

class Bitmap
alias :draw_text2 :draw_text unless defined? :draw_text2
def draw_text(*args)
case args.size
when 2
rect = args[0]
text = args[1].split("\n")
align = 0
when 3
rect = args[0]
text = args[1].split("\n")
align = args[2]%3
when 5
rect = Rect.new(*(args[0,4]))
text = args[4].split("\n")
align = 0
when 6
rect = Rect.new(*(args[0,4]))
text = args[4].split("\n")
align = args[5]%3
else
raise ArgumentError,"错误的参数个数(#{args.size} to 2,3,5,6)."
end
return if text.empty?
wmax = [text.map{|t| self.text_size(t).width}.max,rect.width].min
h = self.text_size(text[0]).height
hmax = [h*text.size,rect.height].min
y = rect.y+(rect.height-hmax)/2
x = align==0 ? rect.x : align==2 ? rect.x+rect.width-wmax : rect.x+(rect.width-wmax)/2
text.each_with_index{|t,i|
draw_text2(x,y+i*h,wmax,h,t,align)
}
self
end
end