【麦可网】Cocos2d-X跨平台游戏开发---学习笔记
第十六课:Cocos2D-X几何图形1-3
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课程目标:
- Cocos2D-X几何图形绘制
课程重点:
- Cocos2D-X几何图形绘制
- Cocos2D-X节点理解
考核目标:
- Cocos2D-X几何图形绘制
- Cocos2D-X节点理解
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参考代码:tests->DrawPrimitives Test
void DrawPrimitivesTest::draw() { CHECK_GL_ERROR_DEBUG(); // draw a simple line // The default state is: // Line Width: 1 // color: 255,255,255,255 (white, non-transparent) // Anti-Aliased // glEnable(GL_LINE_SMOOTH); //直线绘制 ccDrawLine( VisibleRect::leftBottom(), VisibleRect::rightTop() ); CHECK_GL_ERROR_DEBUG(); // line: color, width, aliased // glLineWidth > 1 and GL_LINE_SMOOTH are not compatible // GL_SMOOTH_LINE_WIDTH_RANGE = (1,1) on iPhone // glDisable(GL_LINE_SMOOTH); glLineWidth( 5.0f ); //设置线的宽度,opengl的设置将会影响后面的画线 //设置颜色 ccDrawColor4B(255,0,0,255); ccDrawLine( VisibleRect::leftTop(), VisibleRect::rightBottom() ); CHECK_GL_ERROR_DEBUG(); // TIP: // If you are going to use always the same color or width, you don't // need to call it before every draw // // Remember: OpenGL is a state-machine. // draw big point in the center //改变点的尺寸和颜色 ccPointSize(64); ccDrawColor4B(0,0,255,128); ccDrawPoint( VisibleRect::center() ); CHECK_GL_ERROR_DEBUG(); // draw 4 small points //绘制四个点 CCPoint points[] = { ccp(60,60), ccp(70,70), ccp(60,70), ccp(70,60) }; ccPointSize(4); ccDrawColor4B(0,255,255,255); ccDrawPoints( points, 4); CHECK_GL_ERROR_DEBUG(); // draw a green circle with 10 segments //绘制10段的圆 glLineWidth(16); ccDrawColor4B(0, 255, 0, 255); //参数依次是:1.中心点 2.半径 3.角度 4.几段 5.是否画一条半径 ccDrawCircle( VisibleRect::center(), 100, 0, 10, false); CHECK_GL_ERROR_DEBUG(); // draw a green circle with 50 segments with line to center glLineWidth(2); ccDrawColor4B(0, 255, 255, 255); ccDrawCircle( VisibleRect::center(), 50, CC_DEGREES_TO_RADIANS(90), 50, true); CHECK_GL_ERROR_DEBUG(); // open yellow poly //绘制指定5个点的多边形 ccDrawColor4B(255, 255, 0, 255); glLineWidth(10); CCPoint vertices[] = { ccp(0,0), ccp(50,50), ccp(100,50), ccp(100,100), ccp(50,100) }; ccDrawPoly( vertices, 5, false); CHECK_GL_ERROR_DEBUG(); // filled poly //绘制填充颜色的多边形 glLineWidth(1); CCPoint filledVertices[] = { ccp(0,120), ccp(50,120), ccp(50,170), ccp(25,200), ccp(0,170) }; ccDrawSolidPoly(filledVertices, 5, ccc4f(0.5f, 0.5f, 1, 1 ) ); // closed purble poly //绘制紫色的闭合图形 ccDrawColor4B(255, 0, 255, 255); glLineWidth(2); CCPoint vertices2[] = { ccp(30,130), ccp(30,230), ccp(50,200) }; ccDrawPoly( vertices2, 3, true); CHECK_GL_ERROR_DEBUG(); // draw quad bezier path //绘制四次贝塞尔曲线 ccDrawQuadBezier(VisibleRect::leftTop(), VisibleRect::center(), VisibleRect::rightTop(), 50); CHECK_GL_ERROR_DEBUG(); // draw cubic bezier path //绘制三次贝塞尔曲线 ccDrawCubicBezier(VisibleRect::center(), ccp(VisibleRect::center().x+30,VisibleRect::center().y+50), ccp(VisibleRect::center().x+60,VisibleRect::center().y-50),VisibleRect::right(),100); CHECK_GL_ERROR_DEBUG(); //draw a solid polygon CCPoint vertices3[] = {ccp(60,160), ccp(70,190), ccp(100,190), ccp(90,160)}; //ccc4f,参数既可以是0-1,也可以是0-255 ccDrawSolidPoly( vertices3, 4, ccc4f(1,1,0,1) ); // restore original values //恢复原始值 glLineWidth(1); ccDrawColor4B(255,255,255,255); ccPointSize(1); CHECK_GL_ERROR_DEBUG(); }
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总结:
绘制几何图形,让我联想到电影海洋之歌里面的各种图片的几何美。绘制幽美的轨迹就靠几何图像了。
开心一刻:
鱼说:“我时时刻刻把眼睁开是为了在你身边不舍离开。”水说:“我终日流淌不知疲倦是为了围绕你,好好把你抱紧。”锅说:“都他妈快熟了还这么多废话。”
【麦可网】Cocos2d-X跨平台游戏开发---教程下载:http://pan.baidu.com/s/1kTio1Av
【麦可网】Cocos2d-X跨平台游戏开发---笔记系列:http://blog.csdn.net/qiulanzhu