“毛星雲OpenCV3程式設計入門之python實現”第六篇基本圖形繪製
阿新 • • 發佈：2018-12-14
4.3基本圖形繪製
python程式碼：
# -*- coding: utf-8 -*-
__author__ = 'sunzhilong'
import cv2
import numpy as np
image = np.zeros((600,600,3), dtype=np.uint8)
# 畫橢圓
cv2.ellipse( image,
(int(image.shape[0]/2), int(image.shape[1]/2)), # 圓心 int型
(int(image.shape[0]/4) ,int(image.shape[1]/16)), # 長短軸 int型 原書中C++程式碼：
//--------------------------------------【程式說明】-------------------------------------------
// 程式說明：《OpenCV3程式設計入門》OpenCV3版書本配套示例程式20
// 程式描述：使用OpenCV進行基本的繪圖操作
// 開發測試所用作業系統： Windows 7 64bit
// 開發測試所用IDE版本：Visual Studio 2010
// 開發測試所用OpenCV版本： 3.0 beta
// 2014年11月 Created by @淺墨_毛星雲
// 2014年12月 Revised by @淺墨_毛星雲
//------------------------------------------------------------------------------------------------
//---------------------------------【標頭檔案、名稱空間包含部分】----------------------------
// 描述：包含程式所使用的標頭檔案和名稱空間
//------------------------------------------------------------------------------------------------
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
using namespace cv;
//此程式對於OpenCV3版需要額外包含標頭檔案：
#include <opencv2/imgproc/imgproc.hpp>
//-----------------------------------【巨集定義部分】--------------------------------------------
// 描述：定義一些輔助巨集
//------------------------------------------------------------------------------------------------
#define WINDOW_NAME1 "【繪製圖1】" //為視窗標題定義的巨集
#define WINDOW_NAME2 "【繪製圖2】" //為視窗標題定義的巨集
#define WINDOW_WIDTH 600//定義視窗大小的巨集
//--------------------------------【全域性函式宣告部分】-------------------------------------
// 描述：全域性函式宣告
//-----------------------------------------------------------------------------------------------
void DrawEllipse( Mat img, double angle );//繪製橢圓
void DrawFilledCircle( Mat img, Point center );//繪製圓
void DrawPolygon( Mat img );//繪製多邊形
void DrawLine( Mat img, Point start, Point end );//繪製線段
//-----------------------------------【ShowHelpText( )函式】----------------------------------
// 描述：輸出一些幫助資訊
//----------------------------------------------------------------------------------------------
void ShowHelpText()
{
//輸出歡迎資訊和OpenCV版本
printf("\n\n\t\t\t非常感謝購買《OpenCV3程式設計入門》一書！\n");
printf("\n\n\t\t\t此為本書OpenCV3版的第20個配套示例程式\n");
printf("\n\n\t\t\t 當前使用的OpenCV版本為：" CV_VERSION );
printf("\n\n ----------------------------------------------------------------------------\n");
}
//---------------------------------------【main( )函式】--------------------------------------
// 描述：控制檯應用程式的入口函式，我們的程式從這裡開始執行
//-----------------------------------------------------------------------------------------------
int main( void )
{
// 建立空白的Mat影象
Mat atomImage = Mat::zeros( WINDOW_WIDTH, WINDOW_WIDTH, CV_8UC3 );
Mat rookImage = Mat::zeros( WINDOW_WIDTH, WINDOW_WIDTH, CV_8UC3 );
ShowHelpText();
// ---------------------<1>繪製化學中的原子示例圖------------------------
//【1.1】先繪製出橢圓
DrawEllipse( atomImage, 90 );
DrawEllipse( atomImage, 0 );
DrawEllipse( atomImage, 45 );
DrawEllipse( atomImage, -45 );
//【1.2】再繪製圓心
DrawFilledCircle( atomImage, Point( WINDOW_WIDTH/2, WINDOW_WIDTH/2) );
// ----------------------------<2>繪製組合圖-----------------------------
//【2.1】先繪製出橢圓
DrawPolygon( rookImage );
// 【2.2】繪製矩形
rectangle( rookImage,
Point( 0, 7*WINDOW_WIDTH/8 ),
Point( WINDOW_WIDTH, WINDOW_WIDTH),
Scalar( 0, 255, 255 ),
-1,
8 );
// 【2.3】繪製一些線段
DrawLine( rookImage, Point( 0, 15*WINDOW_WIDTH/16 ), Point( WINDOW_WIDTH, 15*WINDOW_WIDTH/16 ) );
DrawLine( rookImage, Point( WINDOW_WIDTH/4, 7*WINDOW_WIDTH/8 ), Point( WINDOW_WIDTH/4, WINDOW_WIDTH ) );
DrawLine( rookImage, Point( WINDOW_WIDTH/2, 7*WINDOW_WIDTH/8 ), Point( WINDOW_WIDTH/2, WINDOW_WIDTH ) );
DrawLine( rookImage, Point( 3*WINDOW_WIDTH/4, 7*WINDOW_WIDTH/8 ), Point( 3*WINDOW_WIDTH/4, WINDOW_WIDTH ) );
// ---------------------------<3>顯示繪製出的影象------------------------
imshow( WINDOW_NAME1, atomImage );
moveWindow( WINDOW_NAME1, 0, 200 );
imshow( WINDOW_NAME2, rookImage );
moveWindow( WINDOW_NAME2, WINDOW_WIDTH, 200 );
waitKey( 0 );
return(0);
}
//-------------------------------【DrawEllipse( )函式】--------------------------------
// 描述：自定義的繪製函式，實現了繪製不同角度、相同尺寸的橢圓
//-----------------------------------------------------------------------------------------
void DrawEllipse( Mat img, double angle )
{
int thickness = 2;
int lineType = 8;
ellipse( img,
Point( WINDOW_WIDTH/2, WINDOW_WIDTH/2 ),
Size( WINDOW_WIDTH/4, WINDOW_WIDTH/16 ),
angle,
0,
360,
Scalar( 255, 129, 0 ),
thickness,
lineType );
}
//-----------------------------------【DrawFilledCircle( )函式】---------------------------
// 描述：自定義的繪製函式，實現了實心圓的繪製
//-----------------------------------------------------------------------------------------
void DrawFilledCircle( Mat img, Point center )
{
int thickness = -1;
int lineType = 8;
circle( img,
center,
WINDOW_WIDTH/32,
Scalar( 0, 0, 255 ),
thickness,
lineType );
}
//-----------------------------------【DrawPolygon( )函式】--------------------------
// 描述：自定義的繪製函式，實現了凹多邊形的繪製
//--------------------------------------------------------------------------------------
void DrawPolygon( Mat img )
{
int lineType = 8;
//建立一些點
Point rookPoints[1][20];
rookPoints[0][0] = Point( WINDOW_WIDTH/4, 7*WINDOW_WIDTH/8 );
rookPoints[0][1] = Point( 3*WINDOW_WIDTH/4, 7*WINDOW_WIDTH/8 );
rookPoints[0][2] = Point( 3*WINDOW_WIDTH/4, 13*WINDOW_WIDTH/16 );
rookPoints[0][3] = Point( 11*WINDOW_WIDTH/16, 13*WINDOW_WIDTH/16 );
rookPoints[0][4] = Point( 19*WINDOW_WIDTH/32, 3*WINDOW_WIDTH/8 );
rookPoints[0][5] = Point( 3*WINDOW_WIDTH/4, 3*WINDOW_WIDTH/8 );
rookPoints[0][6] = Point( 3*WINDOW_WIDTH/4, WINDOW_WIDTH/8 );
rookPoints[0][7] = Point( 26*WINDOW_WIDTH/40, WINDOW_WIDTH/8 );
rookPoints[0][8] = Point( 26*WINDOW_WIDTH/40, WINDOW_WIDTH/4 );
rookPoints[0][9] = Point( 22*WINDOW_WIDTH/40, WINDOW_WIDTH/4 );
rookPoints[0][10] = Point( 22*WINDOW_WIDTH/40, WINDOW_WIDTH/8 );
rookPoints[0][11] = Point( 18*WINDOW_WIDTH/40, WINDOW_WIDTH/8 );
rookPoints[0][12] = Point( 18*WINDOW_WIDTH/40, WINDOW_WIDTH/4 );
rookPoints[0][13] = Point( 14*WINDOW_WIDTH/40, WINDOW_WIDTH/4 );
rookPoints[0][14] = Point( 14*WINDOW_WIDTH/40, WINDOW_WIDTH/8 );
rookPoints[0][15] = Point( WINDOW_WIDTH/4, WINDOW_WIDTH/8 );
rookPoints[0][16] = Point( WINDOW_WIDTH/4, 3*WINDOW_WIDTH/8 );
rookPoints[0][17] = Point( 13*WINDOW_WIDTH/32, 3*WINDOW_WIDTH/8 );
rookPoints[0][18] = Point( 5*WINDOW_WIDTH/16, 13*WINDOW_WIDTH/16 );
rookPoints[0][19] = Point( WINDOW_WIDTH/4, 13*WINDOW_WIDTH/16 );
const Point* ppt[1] = { rookPoints[0] };
int npt[] = { 20 };
fillPoly( img,
ppt,
npt,
1,
Scalar( 255, 255, 255 ),
lineType );
}
//-----------------------------------【DrawLine( )函式】--------------------------
// 描述：自定義的繪製函式，實現了線的繪製
//---------------------------------------------------------------------------------
void DrawLine( Mat img, Point start, Point end )
{
int thickness = 2;
int lineType = 8;
line( img,
start,
end,
Scalar( 0, 0, 0 ),
thickness,
lineType );
}