SimpleCG绘图函数(3)--绘制矩形

前面我们已经学习了点和线的绘制,本篇我们继续绘图函数学习----矩形的绘制，也就是长方形的绘制,并给出一个绘制楼房的例子演示矩形的应用。

所有绘制矩形相关函数如下：

//以下矩形左上角坐标(left, top)，右下角坐标(right,bottom )
//以线条颜色绘制边框，以填充颜色填充内部//画无填充矩形
void rectangle( int left, int top, int right, int bottom );//画无边框填充矩形
void solidrectangle( int left, int top, int right, int bottom );//画填充矩形
void fillrectangle( int left, int top, int right, int bottom );//清空矩形，以背景色清空矩形
void clearrectangle( int left, int top, int right, int bottom );

可以看到有四个绘制函数,而且参数都是一致的,参数标明矩形左上角坐标，及右下角坐标。

四个函数效果分别是：

1、画无填充矩形 rectangle

2、画无边框填充矩形 solidrectangle

3、画填充矩形 fillrectangle

4、清空矩形，以背景色清空矩形 clearrectangle

我们以后会看到所有针对类似矩形这种具有面积的图形,都分别实现四种绘制效果,分别是1、无填充--不带有前缀,2、无边框--solid开头，3、带边框及填充--fill开头，4、清空形状区域，也就是以背景色填充。

下面用一个随机城市建筑的绘制例程展示矩形的简单应用:

// Building.cpp : 定义控制台应用程序的入口点。
//#include "stdafx.h"#include "../import/include/CGBoard.h"
#include "math.h"#ifdef _DEBUG
#pragma comment(lib,"../import/lib/SimpleCG_MDd.lib")
#else
#pragma comment(lib,"../import/lib/SimpleCG_MD.lib")
#endif#define SUBCOLOR(x,y) ((x-y)<0?0:(x-y))
#define ADDCOLOR(x,y) ((x+y)>255?255:(x+y))
int g_nWidth = 600;		//画面宽度
int g_nHeight= 600;		//画面高度//画建筑的窗户1
void DrawWindow1( int nX, int nY, int nWidth, int nHeight, int nWidthCnt, int nHeightCnt )
{int i;int j;if(nWidthCnt<=0||nHeightCnt<=0)return;int nWidthWindow = nWidth / nWidthCnt;int nHeightWindow = nHeight / nHeightCnt;setfillcolor(RGB(rand()%200,130,180));for( j=0; j<nHeightCnt; j++ )for( i=0; i<nWidthCnt; i++ ){//画填充矩形fillrectangle( nX+nWidthWindow*i, nY+nHeightWindow*j, nX+nWidthWindow*i+nWidthWindow-5, nY+nHeightWindow*j+nHeightWindow-3 );}
}
//画建筑的窗户2
void DrawWindow2( int nX, int nY, int nWidth, int nHeight, int nHeightCnt )
{int i;int j;if(nHeightCnt<=0)return;int nHeightWindow = nHeight / nHeightCnt;setfillcolor(RGB(rand()%255,rand()%255,rand()%255));//画填充矩形fillrectangle( nX, nY, nX+nWidth, nY+nHeight );setfillcolor(RGB(200+rand()%55,200+rand()%55,200+rand()%55));for( j=0; j<nHeightCnt; j++ ){//填充矩形画横边solidrectangle( nX+1, nY+nHeightWindow*j, nX+nWidth, nY+nHeightWindow*j+3 );}//填充矩形画竖边if(rand()%2){solidrectangle( nX+nWidth/5, nY, nX+nWidth/5+10, nY+nHeight );solidrectangle( nX+nWidth*4/5, nY, nX+nWidth*4/5+10, nY+nHeight );}
}
//画建筑的窗户3
void DrawWindow3( int nX, int nY, int nWidth, int nHeight, COLORREF  nColor )
{int i;int j;int nWidthCnt = nWidth / 10;int nHeightCnt = nHeight / 10;int r=GetRValue(nColor);int g=GetGValue(nColor);int b=GetBValue(nColor);setfillcolor(RGB( SUBCOLOR(r,50),SUBCOLOR(g,50),SUBCOLOR(b,50) ));//画填充矩形solidrectangle( nX, nY, nX+nWidth, nY+nHeight );r=GetRValue(nColor);g=GetGValue(nColor);b=GetBValue(nColor);setfillcolor(RGB( ADDCOLOR(r,30),ADDCOLOR(g,30),ADDCOLOR(b,30) ));for( i=1; i<nWidthCnt; i++ ){//画填充矩形solidrectangle( nX+10*i, nY, nX+10*i+3, nY+nHeight );}for( i=1; i<nHeightCnt; i++ ){//画填充矩形solidrectangle( nX, nY+10*i, nX+nWidth, nY+10*i+3 );}	
}
//画建筑类型1
void DrawBuilding1( int nX, int nY, int nWidth, int nHeight )
{int nWidthCnt = (nWidth-10) / 20;int nHeightCnt = (nHeight-10) / 30;//画填充矩形COLORREF  nColor= RGB(rand()%255,rand()%255,rand()%255);if(rand()%2){//房顶if(rand()%2){setfillcolor(RGB(0,0,0));fillrectangle( nX + nWidth-nWidth/4, nY - nHeight-80, nX + nWidth-nWidth/4+3, nY - nHeight );}setfillcolor(nColor);if(rand()%2){fillrectangle( nX + nWidth-nWidth/4-20, nY - nHeight-40, nX + nWidth-20-nWidth/4+20, nY - nHeight );}fillrectangle( nX+20, nY - nHeight-20, nX + nWidth-20, nY - nHeight );}setfillcolor(nColor);fillrectangle( nX, nY - nHeight, nX + nWidth, nY );int nWindowType=rand()%2;switch(nWindowType){case 1:DrawWindow1( nX+(nWidth-nWidthCnt*20)/2, nY - nHeight+(nHeight-nHeightCnt*30)/2, nWidthCnt*20, nHeightCnt*30, nWidthCnt, nHeightCnt );break;default:nWidthCnt = (nWidth-10) / 20;nHeightCnt = (nHeight-10) / 10;DrawWindow2( nX+(nWidth-nWidthCnt*20)/2, nY - nHeight+(nHeight-nHeightCnt*10)/2, nWidthCnt*20, nHeightCnt*10, nHeightCnt );break;}
}
//画建筑类型2
void DrawBuilding2( int nX, int nY, int nWidth, int nHeight )
{int nFloorHeight=nHeight/3;int nFloorWidth=nWidth/3;int nWidthCnt = (nFloorWidth-10) / 20;int nHeightCnt = (nFloorHeight-6) / 30;COLORREF  nColor= RGB(rand()%255,rand()%255,rand()%255);//房顶if(rand()%2){setfillcolor(RGB(0,0,0));fillrectangle( nX + nFloorWidth/4, nY - nHeight-80, nX + nFloorWidth/4+3, nY - nHeight );}//房体//画填充矩形setfillcolor(nColor);fillrectangle( nX, nY - nHeight, nX + nFloorWidth, nY - nHeight + nFloorHeight );DrawWindow1( nX+(nFloorWidth-nWidthCnt*20)/2, nY - nHeight+(nFloorHeight-nHeightCnt*30)/2, nWidthCnt*20, nHeightCnt*30, nWidthCnt, nHeightCnt );fillrectangle( nX, nY - nHeight + nFloorHeight, nX + nFloorWidth*2, nY - nHeight + nFloorHeight*2 );DrawWindow1( nX+(nFloorWidth-nWidthCnt*20)/2, nY - nHeight+nFloorHeight+(nFloorHeight-nHeightCnt*30)/2, nWidthCnt*40, nHeightCnt*30, nWidthCnt*2, nHeightCnt );fillrectangle( nX, nY - nHeight + nFloorHeight*2, nX + nWidth, nY );DrawWindow1( nX+(nFloorWidth-nWidthCnt*20)/2, nY - nHeight+nFloorHeight*2+(nFloorHeight-nHeightCnt*30)/2, nWidthCnt*60, nHeightCnt*30, nWidthCnt*3, nHeightCnt );
}
void DrawBuilding3Floor( int nX, int nY, int nWidth, int nHeight, COLORREF  nColor )
{//画填充矩形int nPad=5;setfillcolor(nColor);fillrectangle( nX, nY, nX + nWidth, nY + nHeight );DrawWindow3( nX+nPad, nY +nPad, nWidth-nPad*2, nHeight  - nPad*2, nColor );
}
//画建筑类型3
void DrawBuilding3( int nX, int nY, int nWidth, int nHeight )
{int i;int nPad=3;int nInner=10;int nWindowWidth=10;int nFloorHeight=nHeight/8;int nWidthCnt = (nWidth-30) / nWindowWidth;int nHeightCnt = (nFloorHeight-10) / nWindowWidth;COLORREF  nColor= RGB(rand()%200,rand()%200,rand()%200);int y=nY;for( i=0; i<8; i++ ){if(i%2==0)nInner = 10;elsenInner = 0;DrawBuilding3Floor( nX+nInner, y-nFloorHeight, nWidth, nFloorHeight, nColor);y -= nFloorHeight;}
}
void DrawProcess()
{int i;line( 0, g_nHeight-80, g_nWidth, g_nHeight-80 );for( i=0; i<8; i++ ){int nWindowType=rand()%3;switch(nWindowType){case 1:DrawBuilding1( rand()%500, g_nHeight-80, 100+rand()%200, 220+rand()%200 );break;case 2:DrawBuilding2( rand()%500, g_nHeight-80, 100+rand()%200, 220+rand()%200 );break;default:DrawBuilding3( rand()%500, g_nHeight-80, 100+rand()%200, 220+rand()%200 );break;}}//马路setfillcolor(0);fillrectangle( 0, g_nHeight-80, g_nWidth, g_nHeight );setfillcolor(RGB(255,255,2555));for( i=0; i<g_nWidth; i+=100 ){solidrectangle( i, g_nHeight-60, i+50, g_nHeight-50 );}
}
int _tmain(int argc, _TCHAR* argv[])
{srand(GetTickCount());//初始化if( !ShowingBoard(g_nWidth,g_nHeight, DrawProcess))return 1;//关闭图库CloseBoard();return 0;
}

可以看到所有图形元素都是用矩形绘制，发挥你的想象，你一定能发现矩形的更多更好玩的用法。

运行界面：