C # small exercise notes: generate a Rose Line Pattern

This article is from the csdn blog,Reposted source (column of the tree man in Summer) 

Discuss this pattern with Vincent. He uses js to implement this Rose Line Pattern and uses the new HTML5 features. It is found that this pattern can be implemented in other languages. The results are quite good.

Mathematical formula: P = A * sin (Num * angle );

I would like to try an experiment to see if other languages can be generated in the same way. The tested principles are the same. This time I used the C # drawing API. The premise is that I am not familiar with C # And it takes a lot of time to read this document. And I am not familiar with it. C # is operating. I wrote a script. Fortunately, the pattern is generated.

Step 1: Create a C # windows application. Name: Rose Wire

 

Add this event to the paint event on the property panel.

 

 

 

C # source code:

The difference is that different degrees will produce different results. But the formula is the same.

// Double [] point1 = getpoint (200, (I-1) * Math. PI/180, 2 );

// Double [] point2 = getpoint (200, I * Math. PI/180,2 );

Double [] point1 = getpoint (200, (I-1), 5 );

Double [] point2 = getpoint (200, I, 5 );

Here, I use the trigonometric function transformation to find the coordinate values of X and Y, and then link them one by one from the start point.

P0 -- P1 --> P2 --> p3... keep connected like this. In this way, we can see the pattern we want to see.

 

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Using system;
Using system. Collections. Generic;
Using system. componentmodel;
Using system. Data;
Using system. drawing;
Using system. text;
Using system. Windows. forms;


Namespace rose Wire
{
Public partial class form1: Form
{
Public form1 ()
{
Initializecomponent ();
}


Private void form1_paint (Object sender, painteventargs E)
{

Graphics G = E. graphics;
Pen P = new pen (color. Black, 1 );

For (INT I = 1; I <= 360; I ++)
{

// Double [] point1 = getpoint (200, (I-1) * Math. PI/180, 2 );

// Double [] point2 = getpoint (200, I * Math. PI/180,2 );

Double [] point1 = getpoint (200, (I-1), 5 );

Double [] point2 = getpoint (200, I, 5 );

G. drawline (p, 250 + convert. toint32 (point1 [0]), 200 + convert. toint32 (point1 [1]), 250 + convert. toint32 (point2 [0]), 200 + convert. toint32 (point2 [1]);

}

}

Private double [] getpoint (int r, double I, int num)
{

Double Len = r * Math. Sin (Num * I );
Double [] Point = change (Len, I );
Return Point;

}


Private double [] Change (double Len, double angle)
{

Double [] array = new double [2];
Array [0] = Len * Math. Cos (angle );
Array [1] = Len * Math. Sin (angle );
Return array;
}



}
}