嵌入式在开发板上画圆

刺骨的言语ヽ痛彻心扉 2022-05-17 12:12 430阅读 0赞

**嵌入式 在开发板上画圆**

**一、简述**

**         记--在开发板(6818,cortex,800W\*480H)上画出圆形。**

**         源码打包：链接：https://pan.baidu.com/s/123gNBZecp\_52lC-LZpUt5A 密码：zela**

**二、例子**

**     1、 一个静态的圆。**

**        主要测试代码**

void lcd_draw_point(unsigned int x, unsigned int y, unsigned int color, unsigned int *lcd_ptr)
    {
    	if( x<LCD_WIDTH && y<LCD_HEIGHT )
    	{
    		*(lcd_ptr+LCD_WIDTH*y+x) = color;
    	}
    }
    
    void lcd_draw_circle(unsigned r_x, unsigned int r_y, unsigned int radius, unsigned int *lcd_ptr)
    {
    	unsigned int x_begin, y_begin;
    	if(r_x-radius<0)
    	{
    		r_x = radius;
    	}
    	if(r_y-radius<0)
    	{
    		r_y = radius;
    	}
            for(y_begin=r_y-radius; y_begin<r_y+radius; y_begin++)
            {
           		 for(x_begin=r_x-radius; x_begin<r_x+radius; x_begin++)
                     {
                           if((r_x-x_begin)*(r_x-x_begin) + (r_y-y_begin)*(r_y-y_begin) < radius*radius)
                           {
                                    lcd_draw_point(x_begin, y_begin, 0x0000ff00, lcd_ptr);
                           }
                     }
           }
    }

**        编译代码，在开发板运行：**

**         **![70][]

![70 1][]

**        代码效果**

**        **![70 2][]

**     2、滚动的圆**

**         主要测试代码：**

**         **

void lcd_draw_run_circle(unsigned r_x, unsigned int r_y, unsigned int radius, unsigned int mv_speed, unsigned int *lcd_ptr)
    {
    	int x_mv = mv_speed, y_mv = mv_speed;
    	unsigned int x_begin, y_begin;
    	if(r_x-radius<0)
    	{
    		r_x = radius;
    	}
    	if(r_y-radius<0)
    	{
    		r_y = radius;
    	}
    	while(1)
    	{
            	for(y_begin=r_y-radius; y_begin<r_y+radius; y_begin++)
            	{
           			 for(x_begin=r_x-radius; x_begin<r_x+radius; x_begin++)
                     	{
                           		if((r_x-x_begin)*(r_x-x_begin) + (r_y-y_begin)*(r_y-y_begin) < radius*radius)
                           		{
                            	        lcd_draw_point(x_begin, y_begin, 0x0000ff00, lcd_ptr);
                           		}
                     	}
    		}
    		
    		if(r_x<radius || r_x>= LCD_WIDTH - radius)
    		{
    			x_mv = -x_mv;
    		}		
    		r_x += x_mv;	
    		if(r_y<radius || r_y>= LCD_HEIGHT - radius)
    		{
    			y_mv = -y_mv;
    		}		
    		r_y += y_mv;
    
    		for(y_begin=0; y_begin<LCD_HEIGHT; y_begin++)
                    {
                             for(x_begin=0; x_begin<LCD_WIDTH; x_begin++)
                            {
                                    if((r_x-x_begin)*(r_x-x_begin) + (r_y-y_begin)*(r_y-y_begin) >= radius*radius)
                                    {   
                                            lcd_draw_point(x_begin, y_begin, WHITE_COLOR, lcd_ptr);
                                    }   
                            }   
                    }
    
           }
    }

**        代码效果**

**        **![70 3][]

**三、补充**

**      颜色：0xaarrggbb 其中aa是透明度，rr是红色，gg是绿色，bb蓝色。（三原色0~255）**

**                 0x00FFFFFF白色**

[70]: /images/20220517/d3a16efea2c446ddb21bd0b2def9907a.png
[70 1]: /images/20220517/588238d4e59e493e834b725371730526.png
[70 2]: /images/20220517/7b561bde487a4bd3a997f730c5f0960f.png
[70 3]: /images/20220517/95649f7f439e4cce84e2a88c667064ee.png