PCB ODB (Gerber)图形绘制实现方法

解析PCB图形，说简单也非常简单，先说一下,PCB Gerber图形由：点，线，弧，铜皮，文字 5类元素组成，通常简写为:P,L,A,S,T五类，这几类元素的难易程度，刚好是按这个顺序排列的(个人实际应用这么认为的)。即然是5类就得建立5种元素的数据结构存储它吧。

/// PAD 数据类型 public struct gP { public gPoint p; public bool negative;//polarity-- positive negative public int angle; public bool mirror; public string symbols; public string attribut; public double width; }线结构

/// Line 数据类型 public struct gL { public gPoint ps; public gPoint pe; public bool negative;//polarity-- positive negative public string symbols; public string attribut; public double width; }弧结构

/// ARC 数据类型 public struct gA { public gPoint ps; public gPoint pe; public gPoint pc; public bool negative;//polarity-- positive negative public bool ccw; //direction-- cw ccw public string symbols; public string attribut; public double width; }铜皮结构

/// Surface 坐标泛型集类1 public struct gSur_Point { public gPoint p; /// 0为折点 1为顺时针 2为逆时针 public byte type_point; } /// Surface 坐标泛型集类2 public class gSur_list { public List<gSur_Point> sur_list = new List<gSur_Point>(); /// 是否为空洞 /// </summary> public bool is_hole { get; set; } /// 是否逆时针 public bool is_ccw { get; set; } } /// Surface 坐标泛型集类3 public class gS { public List<gSur_list> sur_group = new List<gSur_list>(); /// 是否为负 polarity-- P N public bool negative { get; set; } public string attribut { get; set; } }文字结构

看这个结构比Surface铜皮结构还简单呀，为什么文字结构更复杂了，这里只是实现最普通的字体结构，实际复杂程度远大于Surface,需要解析到所用到的字体库中的的坐标，而且字体存在各式各样的，有二维码，点阵字，有条码，要想保证和Genesis所显示一致，这里需要下点功夫。

/// Text 文本数据类型 简易型 更复杂的需要扩展 public struct gT { public gPoint ps; public string font; public bool negative;//polarity-- positive negative public int angle; public bool mirror; public double x_size; public double y_size; public double width; public string Text; public string attribut; }

那么为什么symbols不算一类呢，因为symbols也是由这5类基础元素组合而成的，绘制时检索symbols中所含元素集合，再将Symbols集合遍历一个一个的元素绘制到画板上来的。

Gerber数据存储到这个结构中后.那用Graphics类，遍历元素集合，依次绘制元素就好了;下面说一下遇到的问题解决方法。

1.同一层图形的元素是存在先后顺序的，不能按元素类别分类集合，如List<P>,List<L>,这样是错误的

若元素要按先后顺序保存，那么这里可以选择用ArrayList集合存储数据

2.绘制圆形焊盘时，对于Genesis而言它是一个点坐标，在net中是没有直接绘制点方法.

那么对应net中是用FillEllipse方法绘制就可以了

3.绘制焊盘有很多种symbols，包含标准symbols和非标准symbols(自定义的），如何判断一个symbols是标准symbols还是非标准symbols呢

在解析ODB 或Gerber前，提前将自定义symbols名存储为自定义symbols字典集合中，绘制时优先检测symbols名是否存在自定义字典集合中，如果存在，则解析自定义symbosl绘制，如果不存在，则通过标准symbosl名命名规则匹配，不考虑校率用正则也可以的，如:r200,rect200x300,oval200x300,donut_r300x200等，匹配到标准symbols后通过建立各种标准symbols绘制模版，找到对应的symbols模版再绘制。

4.如绘制：donut_r300x200这个symbols时，是绘制300这个实心圆，再绘制黑色背景实现圆环效果呢，

其实这样绘制就是错误的，需采用：GraphicsPath类绘制，再用Region类差集裁减掉不需要多余部份图形。

5.在Gerber图形中一条弧直径只有0.1毫米，转为像素为0，绘制会出错，

要这里需加以判断，0像素时直接跳出不绘

6.在Gerber图形中一条线段，线段间距只有0.1毫米， 转为像素为0时，但线宽为5毫米，转为像不为2像素，

那这是绘呢，还是不绘呢，由于长度像素是0，但线的宽度达到了2个像素，那么就这条线就按一个点来绘制

7.在Gerber中Surface铜皮中存在空洞时，不能用FillPolygon方法绘制，

需采用：GraphicsPath类绘制，再用Region类差集裁减掉不需要多余部份图形

8.在Gerber中Surface铜皮存在弧节点时，不能用FillPolygon方法绘制，这结构它不支持弧节点，

如果一定要要用FillPolygon可以将弧转为多个节点来绘制多边形，当然另一种方法用GraphicsPath类中增Arc结点来完成弧的绘制

9.Gerber中如果字体引用了shx字体如何解析呢

这里就需要熟悉shx的数据结构了才行了,不然一点办法也没有

点击进去： https://wenku.baidu.com/view/0f7d49c4aa00b52acfc7cab3.html 这是解析方法，解析后再转为坐标数据就可以了

10.如果是：canned_57,standard等字体如何解析呢

这是Genesis自带字体,文件一般存放在：C:\genesis\fw\lib\fonts，这是明文坐标很好解决，直接解析就好了。

这是基本的不全面,可以扩展并改进的.

/// 点 数据类型 (XY) /// </summary> public struct gPoint { public gPoint(gPoint p_) { this.x = p_.x; this.y = p_.y; } public gPoint(double x_val, double y_val) { this.x = x_val; this.y = y_val; } public double x; public double y; public static gPoint operator (gPoint p1, gPoint p2) { p1.x = p2.x; p1.y = p2.y; return p1; } public static gPoint operator -(gPoint p1, gPoint p2) { p1.x -= p2.x; p1.y -= p2.y; return p1; } } /// <summary> /// 精简 PAD 数据类型 /// </summary> public struct gPP { public gPP(double x_val, double y_val, double width_) { this.p = new gPoint(x_val, y_val); this.symbols = "r"; this.width = width_; } public gPP(gPoint p_, double width_) { this.p = p_; this.symbols = "r"; this.width = width_; } public gPP(gPoint p_, string symbols_, double width_) { this.p = p_; this.symbols = symbols_; this.width = width_; } public gPoint p; public string symbols; public double width; public static gPP operator (gPP p1, gPP p2) { p1.p = p2.p; return p1; } public static gPP operator (gPP p1, gPoint p2) { p1.p = p2; return p1; } public static gPP operator -(gPP p1, gPP p2) { p1.p -= p2.p; return p1; } public static gPP operator -(gPP p1, gPoint p2) { p1.p -= p2; return p1; } } /// <summary> /// PAD 数据类型 /// </summary> public struct gP { public gP(double x_val, double y_val, double width_) { this.p = new gPoint(x_val, y_val); this.negative = false; this.angle = 0; this.mirror = false; this.symbols = "r"; this.attribut = string.Empty; this.width = width_; } public gP(gPoint p_, double width_) { this.p = p_; this.negative = false; this.angle = 0; this.mirror = false; this.symbols = "r"; this.attribut = string.Empty; this.width = width_; } public gP(gPoint p_, string symbols_, double width_) { this.p = p_; this.negative = false; this.angle = 0; this.mirror = false; this.symbols = symbols_; this.attribut = string.Empty; this.width = width_; } public gPoint p; public bool negative;//polarity-- positive negative public int angle; public bool mirror; public string symbols; public string attribut; public double width; public static gP operator (gP p1, gP p2) { p1.p = p2.p; return p1; } public static gP operator (gP p1, gPP p2) { p1.p = p2.p; return p1; } public static gP operator (gP p1, gPoint p2) { p1.p = p2; return p1; } public static gP operator -(gP p1, gP p2) { p1.p -= p2.p; return p1; } public static gP operator -(gP p1, gPP p2) { p1.p -= p2.p; return p1; } public static gP operator -(gP p1, gPoint p2) { p1.p -= p2; return p1; } } /// <summary> /// Line 数据类型 /// </summary> public struct gL { public gL(double ps_x, double ps_y, double pe_x, double pe_y, double width_) { this.ps = new gPoint(ps_x, ps_y); this.pe = new gPoint(pe_x, pe_y); this.negative = false; this.symbols = "r" width_.ToString(); this.attribut = string.Empty; this.width = width_; } public gL(gPoint ps_, gPoint pe_, double width_) { this.ps = ps_; this.pe = pe_; this.negative = false; this.symbols = "r" width_.ToString(); this.attribut = string.Empty; this.width = width_; } public gL(gPoint ps_, gPoint pe_, string symbols_, double width_) { this.ps = ps_; this.pe = pe_; this.negative = false; this.symbols = symbols_; this.attribut = string.Empty; this.width = width_; } public gPoint ps; public gPoint pe; public bool negative;//polarity-- positive negative public string symbols; public string attribut; public double width; public static gL operator (gL l1, gPoint move_p) { l1.ps = move_p; l1.pe = move_p; return l1; } public static gL operator (gL l1, gPP move_p) { l1.ps = move_p.p; l1.pe = move_p.p; return l1; } public static gL operator (gL l1, gP move_p) { l1.ps = move_p.p; l1.pe = move_p.p; return l1; } public static gL operator -(gL l1, gPoint move_p) { l1.ps -= move_p; l1.pe -= move_p; return l1; } public static gL operator -(gL l1, gPP move_p) { l1.ps -= move_p.p; l1.pe -= move_p.p; return l1; } public static gL operator -(gL l1, gP move_p) { l1.ps -= move_p.p; l1.pe -= move_p.p; return l1; } } /// <summary> /// ARC 数据类型 /// </summary> public struct gA { public gA(double ps_x, double ps_y, double pc_x, double pc_y, double pe_x, double pe_y, double width_, bool ccw_) { this.ps = new gPoint(ps_x, ps_y); this.pc = new gPoint(pc_x, pc_y); this.pe = new gPoint(pe_x, pe_y); this.negative = false; this.ccw = ccw_; this.symbols = "r" width_.ToString(); this.attribut = string.Empty; this.width = width_; } public gA(gPoint ps_, gPoint pc_, gPoint pe_, double width_, bool ccw_ = false) { this.ps = ps_; this.pc = pc_; this.pe = pe_; this.negative = false; this.ccw = ccw_; this.symbols = "r" width_.ToString(); this.attribut = string.Empty; this.width = width_; } public gPoint ps; public gPoint pe; public gPoint pc; public bool negative;//polarity-- positive negative public bool ccw; //direction-- cw ccw public string symbols; public string attribut; public double width; public static gA operator (gA arc1, gPoint move_p) { arc1.ps = move_p; arc1.pe = move_p; arc1.pc = move_p; return arc1; } public static gA operator (gA arc1, gPP move_p) { arc1.ps = move_p.p; arc1.pe = move_p.p; arc1.pc = move_p.p; return arc1; } public static gA operator (gA arc1, gP move_p) { arc1.ps = move_p.p; arc1.pe = move_p.p; arc1.pc = move_p.p; return arc1; } public static gA operator -(gA arc1, gPoint move_p) { arc1.ps -= move_p; arc1.pe -= move_p; arc1.pc -= move_p; return arc1; } public static gA operator -(gA arc1, gPP move_p) { arc1.ps -= move_p.p; arc1.pe -= move_p.p; arc1.pc -= move_p.p; return arc1; } public static gA operator -(gA arc1, gP move_p) { arc1.ps -= move_p.p; arc1.pe -= move_p.p; arc1.pc -= move_p.p; return arc1; } } /// <summary> /// Text 文本数据类型 简易型 更复杂的需要扩展 /// </summary> public struct gT { public gPoint ps; public string font; public bool negative;//polarity-- positive negative public int angle; public bool mirror; public double x_size; public double y_size; public double width; public string Text; public string attribut; } /// <summary> /// Surface 坐标泛型集类1 /// </summary> public struct gSur_Point { public gSur_Point(double x_val, double y_val, byte type_point_) { this.p.x = x_val; this.p.y = y_val; this.type_point = type_point_; } public gSur_Point(gPoint p, byte type_point_) { this.p = p; this.type_point = type_point_; } public gPoint p; /// <summary> /// 0为折点 1为顺时针 2为逆时针 /// </summary> public byte type_point; } /// <summary> /// Surface 坐标泛型集类2 /// </summary> public class gSur_list { public List<gSur_Point> sur_list = new List<gSur_Point>(); /// <summary> /// 是否为空洞 /// </summary> public bool is_hole { get; set; } /// <summary> /// 是否逆时针 /// </summary> public bool is_ccw { get; set; } } /// <summary> /// Surface 坐标泛型集类3 /// </summary> public class gS { public List<gSur_list> sur_group = new List<gSur_list>(); /// <summary> /// 是否为负 polarity-- P N /// </summary> public bool negative { get; set; } public string attribut { get; set; } } /// <summary> /// 整层Layer坐标泛型集类 /// </summary> public class gLayer //坐标 { public List<gP> Plist = new List<gP>(); public List<gL> Llist = new List<gL>(); public List<gA> Alist = new List<gA>(); public List<gT> Tlist = new List<gT>(); public List<gS> Slist = new List<gS>(); }