在Corona SDK中，如何响应触摸之类的事件来获取DisplayObject的颜色（填充）？ [英] How can I get the colour (fill) of a DisplayObject in response to an event like a touch in Corona SDK?

问题描述

有人可以帮助我找出如何获得电晕中的矩形颜色吗？该矩形我已经充满了颜色，所以现在我想在触摸矩形时获得该颜色。

Can anyone help me find out how can I can get the color of rectangle in corona? That rectangle I already filled with color, so now I want to get that color when I touch on rectangle.

推荐答案

创建矩形：

local rectangle = display.newRect(0, 0, 100, 100)

将颜色以RGBA（您可以省略A）格式放在表中，并将其存储为矩形的自定义属性：

Put your color in RGBA (you can leave out the A) format in a table, and store it as a "custom property" for the rectangle:

rectangle.fillColor = {110, 30, 25}

通过unpack函数的神奇作用，该函数返回表的值，将该表传递给setFillColor：

Through the magic of the unpack function, which returns the values of a table, pass the table to setFillColor:

rectangle:setFillColor( unpack(rectangle.fillColor) )

现在，您总是可以像这样获得颜色：

Now you can always get the color like so:

print( unpack(rectangle.fillColor) ) --> 110    30    25

或

print( rectangle.fillColor ) -- simply returns the table

或将每种颜色放入变量中：

or to put each color in a variable:

local red, green, blue, alpha = unpack(rectangle.fillColor)

您还将看到这对于其他方面也很方便。

You'll see how this can come in handy for other things as well.

编辑

只要想起另一种很酷的方法，就可以劫持setFillColor函数：

Just thought of another cool way of doing it, by highjacking the setFillColor function:

local function decorateRectangle(rect)
    rect.cachedSetFillColor = rect.setFillColor -- store setFillColor function

    function rect:setFillColor(...) -- replace it with our own function
        self:cachedSetFillColor(...)
        self.storedColor = {...} -- store color
    end

    function rect:getFillColor()
        return unpack(self.storedColor)
    end
end

local rectangle = display.newRect(0, 0, 100, 100)

decorateRectangle(rectangle) -- "decorates" rectangle with more awesomeness

现在，您可以使用setFillColor设置颜色为正常值，并使用getFillColor返回颜色：）

Now you can use setFillColor to set color as normal, AND getFillColor to return it :)

rectangle:setFillColor(100, 30, 255, 255)

print(rectangle:getFillColor())

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