Cocos2d-x绘制圆角矩形

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/*
* @brief 画圆角矩形
* @param origin 矩形开始点
* @param destination 矩形结束点
* @param radius 圆角半径
* @param segments 圆角等份数，等份越多，圆角越平滑
* @param bFill 是否填充
* @param color 填充颜色
* @attention
*/
void DrawPrimitivesTest::ccDrawRoundRect( Point origin, Point destination, float radius, unsigned int segments, bool bFill, Color4F color)
{
//算出1/4圆

const float coef = 0.5f * (float)M_PI / segments;
Point * vertices = new Point[segments + 1];
Point * thisVertices = vertices;
for(unsigned int i = 0; i <= segments; ++i, ++thisVertices)
{
float rads = (segments - i)*coef;
thisVertices->x = (int)(radius * sinf(rads));
thisVertices->y = (int)(radius * cosf(rads));
}
//
Point tagCenter;
float minX = MIN(origin.x, destination.x);
float maxX = MAX(origin.x, destination.x);
float minY = MIN(origin.y, destination.y);
float maxY = MAX(origin.y, destination.y);

unsigned int dwPolygonPtMax = (segments + 1) * 4;
Point * pPolygonPtArr = new Point[dwPolygonPtMax];
Point * thisPolygonPt = pPolygonPtArr;
int aa = 0;
//左上角
tagCenter.x = minX + radius;
tagCenter.y = maxY - radius;
thisVertices = vertices;
for(unsigned int i = 0; i <= segments; ++i, ++thisPolygonPt, ++thisVertices)
{
thisPolygonPt->x = tagCenter.x - thisVertices->x;
thisPolygonPt->y = tagCenter.y + thisVertices->y;
++aa;
}
//右上角
tagCenter.x = maxX - radius;
tagCenter.y = maxY - radius;
thisVertices = vertices + segments;
for(unsigned int i = 0; i <= segments; ++i, ++thisPolygonPt, --thisVertices)
{
thisPolygonPt->x = tagCenter.x + thisVertices->x;
thisPolygonPt->y = tagCenter.y + thisVertices->y;
++aa;
}
//右下角
tagCenter.x = maxX - radius;
tagCenter.y = minY + radius;
thisVertices = vertices;
for(unsigned int i = 0; i <= segments; ++i, ++thisPolygonPt, ++thisVertices)
{
thisPolygonPt->x = tagCenter.x + thisVertices->x;
thisPolygonPt->y = tagCenter.y - thisVertices->y;
++aa;
}
//左下角
tagCenter.x = minX + radius;
tagCenter.y = minY + radius;
thisVertices = vertices + segments;
for(unsigned int i = 0; i <= segments; ++i, ++thisPolygonPt, --thisVertices)
{
thisPolygonPt->x = tagCenter.x - thisVertices->x;
thisPolygonPt->y = tagCenter.y - thisVertices->y;
++aa;
}

if(bFill){
DrawPrimitives::drawSolidPoly(pPolygonPtArr, dwPolygonPtMax, color);
}else
{
DrawPrimitives::setDrawColor4F(color.r, color.g, color.b, color.a);
DrawPrimitives::drawPoly(pPolygonPtArr, dwPolygonPtMax, true);
}

CC_SAFE_DELETE_ARRAY(vertices);
CC_SAFE_DELETE_ARRAY(pPolygonPtArr);

}

/** * @brief        画圆角矩形 * @param        origin            矩形开始点 * @param        destination        矩形结束点 * @param        radius            圆角半径 * @param        segments        圆角等份数，等份越多，圆角越平滑 * @param        bFill            是否填充 * @param        color            填充颜色 * @attention */ccDrawRoundRect:function(bgSpr, origin, destination, radius, segments){    var pClip = new cc.ClippingNode();    // 设置是否反向，将决定画出来的圆是透明的还是黑色的    pClip.setInverted(false);    pClip.setAnchorPoint(cc.p(0, 0));    pClip.setPosition(cc.p(-7, -7));    // 算出1/4圆    var coef = 0.5*Math.PI/segments;    var vertices = new Array(segments+1);    for(var i=0; i<= segments;i++){        var rads = (segments-i)*coef;        vertices[i].x = parseInt(radius*Math.sin(rads));        vertices[i].y = parseInt(radius*Math.cos(rads));    }    //    var tagCenter;    var minX = Math.min(origin.x, destination.x);    var maxX = Math.min(origin.x, destination.x);    var minY = Math.min(origin.y, destination.y);    var maxY = Math.min(origin.y, destination.y);    var polygonArr = new Array((segments+1)*4);    var aa = 0;    //左上角    tagCenter.x = minX + radius;    tagCenter.y = maxY - radius;    for(var i=0; i<=segments;i++){        polygonArr[i].x = tagCenter.x-vertices[i].x;        polygonArr[i].y = tagCenter.y+vertices[i].y;        aa = aa+1;    }    //右上角    tagCenter.x = maxX - radius;    tagCenter.y = maxY - radius;    var initVal = aa;    for(var i=initVal; i<=(initVal+segments);i++){        polygonArr[i].x = tagCenter.x+vertices[segments-(i-initVal)].x;        polygonArr[i].y = tagCenter.y+vertices[segments-(i-initVal)].y;        aa = aa+1;    }    //右下角    tagCenter.x = maxX - radius;    tagCenter.y = minY + radius;    var initVal = aa;    for(var i=initVal; i<=(initVal+segments);i++){        polygonArr[i].x = tagCenter.x+vertices[i-initVal].x;        polygonArr[i].y = tagCenter.y-vertices[i-initVal].y;        aa = aa+1;    }    //左下角    tagCenter.x = minX + radius;    tagCenter.y = minY + radius;    var initVal = aa;    for(var i=initVal; i<=(initVal+segments);i++){        polygonArr[i].x = tagCenter.x-vertices[segments-(i-initVal)].x;        polygonArr[i].y = tagCenter.y-vertices[segments-(i-initVal)].y;        aa = aa+1;    }    var pStencil = new cc.DrawNode();    pStencil.drawPoly(polygonArr, (segments+1)*4, false, {r:1.0, g:0, b:0, a:1});    pStencil.setPosition(cc.p(0, 0));    pClip.setStencil(pStencil);    pClip.addChild(bgSpr, 1);    pClip.setContentSize(bgSpr.getContentSize());    return pClip;}

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