cocos2dx-lua 圓角矩形 圓角圖片 drawNode

使用的官方類是：drawNode

函數是：drawNode:drawPolygon()

C++函數的參數說明：

//畫多邊形，verts為點集，count為點數，fillColor為填充顏色，borderWidth為邊緣線寬，borderColor為邊緣線顏色

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

lua用table作為點集

 

代碼如下：

function drawNodeRoundRect(drawNode, rect, borderWidth, radius, color, fillColor) -- segments表示圓角的精細度，值越大越精細
        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圓
        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


    --創建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) --配置參數
    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)