【Godot4.2】CanvasItem绘图函数全解析

【Godot4.2】CanvasItem绘图函数全解析 - 9.绘制表格

news2025/7/19 10:17:31

概述

之前介绍TextLine和TextParagraph的时候，提到了用制表符和设定列宽形式来绘制简易表格，但是很明显，单纯使用此种方式很难获得对表格的精确控制。

所以对于表格绘制问题，我决定单独开坑，单独深入研究。

目前比较好的方式就是:

将表格数据储存为一个二维数组
设定列宽
然后通过遍历每个单元格数据，来构造单独的TextLine或TextParagraph实例，并通过列宽设定动态计算和绘制

系列目录

0.概述
1.绘制简单图形
2.设定绘图变换
3.绘制纹理
4.绘制样式盒
5.绘制字符和字符串
6.TextLine和TextParagraph详解
7.自定义节点TextBoard
8.绘制点索引
9.绘制表格

初期测试代码

以下为我初步测试的代码：

# =======================================================
# 使用绘图函数绘制表格 - 测试1
# 巽星石
# 2024年4月12日18:30:24   Godot 4.2.1
# =======================================================
extends Node2D

var font = ThemeDB.fallback_font

var col_widths := [50,60,60,200]           # 列宽
var data = [
	["序号","姓名","性别","年龄"],
	["1","张三","男","32"],
	["2","李四","男","33"],
	["3","王五","男","34"],
	["4","巽星石","男","34000000000000000000"],
	["5","翼星石","男","34000000000000000000"],
	["6","羿星石","男","34000000000000000000"],
	["7","粪星石","男","34000000000000000000"],
	["8","龚星石","男","34000000000000000000"],
]

var line_height := 20.0                    # 行高
#var col_widths := [50,60,60,200]           # 列宽
var pos := Vector2(100,100)                # 绘制位置 - 表格左上角点
var bg_color:= Color.WHITE                 # 背景色
var th_bg_color:= Color.AQUAMARINE         # 表头背景色
var font_color:= Color.BLACK               # 字色
var border_color:= Color.DARK_GRAY         # 边框色
var padding := 5                           # 内边距

# 计算前几列的累计宽度
func cols_width(col:int):
	var w:float
	for i in range(col):
		w += col_widths[i] + padding * 2
	return w

func _ready() -> void:
	line_height += padding * 2


func _draw() -> void:
	var width = cols_width(col_widths.size())
	var height = line_height * data.size()
	# 背景矩形
	var rect = Rect2(pos,Vector2(width,height))
	draw_rect(rect,bg_color)
	# 表头矩形
	var rect2 = Rect2(pos,Vector2(width,line_height))
	draw_rect(rect2,th_bg_color)
	
	
	draw_line(pos,pos + Vector2(width,0),border_color,1)  # 顶部线
	for l in  range(data.size()): # 遍历数据行
		for i in range(data[l].size()): # 遍历数据列
			# 构造TextLine
			var text = TextLine.new()
			text.add_string(data[l][i],font,16)
			text.width = col_widths[i]
			text.alignment = HORIZONTAL_ALIGNMENT_CENTER
			# 绘制
			text.draw(get_canvas_item(),pos + Vector2(cols_width(i) + padding,(line_height) * l + padding),font_color)
			
		draw_line(pos+Vector2(0,line_height * (l+1)),pos + Vector2(cols_width(col_widths.size()),line_height * (l+1)),border_color,1)
	# 绘制竖线
	for i in range(col_widths.size()+1):
		var a1 = pos +Vector2(cols_width(i),0)
		var a2 = a1 + Vector2(0,line_height * data.size())
		draw_line(a1,a2,border_color,1)