cocos2dx-lua 圆角矩形 圆角图片 drawNode

使用的官方类是：drawNode

函数是：drawNode:drawPolygon()

C++函数的参数说明：

//画多边形，verts为点集，count为点数，fillColor为填充颜色，borderWidth为边缘线宽，borderColor为边缘线颜色

void drawPolygon(Vec2 *verts, int count, const Color4F &fillColor, float borderWidth, const Color4F &borderColor);

lua用table作为点集

 

代码如下：

function drawNodeRoundRect(drawNode, rect, borderWidth, radius, color, fillColor)
        -- segments表示圆角的精细度，值越大越精细
        local segments = 100
        --local segments = 4
        local origin = cc.p(rect.x, rect.y)
        local destination = cc.p(rect.x + rect.width, rect.y - rect.height)
        local points = { }

        -- 算出1/4圆
        local coef = math.pi / 2 / segments
        local vertices = { }

        for i = 0, segments do
            local rads =(segments - i) * coef
            local x = radius * math.sin(rads)
            local y = radius * math.cos(rads)

            table.insert(vertices, cc.p(x, y))
        end

        local tagCenter = cc.p(0, 0)
        local minX = math.min(origin.x, destination.x)
        local maxX = math.max(origin.x, destination.x)
        local minY = math.min(origin.y, destination.y)
        local maxY = math.max(origin.y, destination.y)
        local dwPolygonPtMax =(segments + 1) * 4
        local pPolygonPtArr = { }

        -- 左上角
        tagCenter.x = minX + radius;
        tagCenter.y = maxY - radius;

        for i = 0, segments do
            local x = tagCenter.x - vertices[i + 1].x
            local y = tagCenter.y + vertices[i + 1].y

            table.insert(pPolygonPtArr, cc.p(x, y))
        end

        -- 右上角
        tagCenter.x = maxX - radius;
        tagCenter.y = maxY - radius;

        for i = 0, segments do
            local x = tagCenter.x + vertices[#vertices - i].x
            local y = tagCenter.y + vertices[#vertices - i].y

            table.insert(pPolygonPtArr, cc.p(x, y))
        end

        -- 右下角
        tagCenter.x = maxX - radius;
        tagCenter.y = minY + radius;

        for i = 0, segments do
            local x = tagCenter.x + vertices[i + 1].x
            local y = tagCenter.y - vertices[i + 1].y

            table.insert(pPolygonPtArr, cc.p(x, y))
        end

        -- 左下角
        tagCenter.x = minX + radius;
        tagCenter.y = minY + radius;

        for i = 0, segments do
            local x = tagCenter.x - vertices[#vertices - i].x
            local y = tagCenter.y - vertices[#vertices - i].y

            table.insert(pPolygonPtArr, cc.p(x, y))
        end

        if fillColor == nil then
            fillColor = cc.c4f(1, 1, 1, 1)
        end

        drawNode:drawPolygon(pPolygonPtArr, #pPolygonPtArr, fillColor, borderWidth, color)
    end


    --创建DrawNode
    local imagePath = "res/test.png"
    head = cc.DrawNode:createWithFilename(imagePath)
    head:setAnchorPoint(cc.p(0.5, 0.5))
    head:setPosition(cc.p(156+700-190, 134+170+120))
    scene:addChild(head,9999)



    --配置参数
    local TestRect = {}
    TestRect.x = 0
    TestRect.width = 535
    TestRect.y=0
    TestRect.height = 235

    local TestBorderWidth = 0
    local TestColor = cc.c4f(1,1,1,1)
    local Testradius = 20

    head:clear()
    drawNodeRoundRect(head,TestRect,TestBorderWidth,Testradius,TestColor,TestColor)