public static void DrawPolygon(Texture2D draw_tex, List <int> point_list1, List <int> point_list2, Color area_color)
{
if (point_list1.Count != point_list2.Count || point_list1.Count < 3)
{
Debug.LogError("多边形点集合错误，个数不对！");
return;
}
//创建线多边形，赋值四条边
PlanePolygon linePolygon = new PlanePolygon();
for (int i = 0; i < point_list1.Count - 1; i++)
{
linePolygon.AddEdge(point_list1[i], point_list2[i], point_list1[i + 1], point_list2[i + 1]);
}
linePolygon.AddEdge(point_list1[point_list1.Count - 1], point_list2[point_list1.Count - 1], point_list1[0], point_list2[0]);
//扫描范围
int yMin = linePolygon.YMin;
int yMax = linePolygon.YMax;
//先画好水平线
List <PlaneEdge> horizonLine = linePolygon.GetHorizontalLine();
for (int i = 0; i < horizonLine.Count; i++)
{
if (horizonLine[i].x0 < horizonLine[i].x1)
{
for (int xValue = horizonLine[i].x0; xValue <= horizonLine[i].x1; xValue++)
{
SetPixelColor(draw_tex, xValue, horizonLine[i].ymin, area_color);
}
}
else
{
for (int xValue = horizonLine[i].x1; xValue <= horizonLine[i].x0; xValue++)
{
SetPixelColor(draw_tex, xValue, horizonLine[i].ymin, area_color);
}
}
}
//初始化活性边表
List <PlaneEdge> AELTable = new List <PlaneEdge>();
for (int activeY = yMin; activeY <= yMax; activeY++)
{
//加入到活性边表
List <PlaneEdge> tempAEL = linePolygon.GetAEL(activeY);
if (tempAEL.Count > 0)
{
AELTable.AddRange(tempAEL);
}
//遍历活性边表，求交点
List <int> insectP = new List <int>();
for (int i = 0; i < AELTable.Count; i++)
{
insectP.Add(Convert.ToInt32(AELTable[i].XValue(activeY)));
//删除求解完成的边
if (AELTable[i].ymax - 1 == activeY)
{
AELTable.RemoveAt(i);
i--;
}
}
//交点排序
insectP.Sort();
//填充
if (insectP.Count % 2 != 0)
{
Debug.LogWarning("交点个数不为偶数，自动删除最后一个点，图形应该有误！");
insectP.RemoveAt(insectP.Count - 1);
}
for (int i = 0; i < insectP.Count; i = i + 2)
{
for (int xValue = insectP[i]; xValue <= insectP[i + 1]; xValue++)
{
SetPixelColor(draw_tex, xValue, activeY, area_color);
}
}
}
draw_tex.Apply();
}
public static void DrawSegment(Texture2D draw_tex, int start_x, int start_y, int end_x, int end_y, Color line_color, int thickness)
{ //Debug.Log (start_x);Debug.Log (start_y);Debug.Log (end_x);Debug.Log (end_y);
int R = thickness; //端点半径
//DDA算法
//YX轴步进
int xDis = end_x - start_x;
int yDis = end_y - start_y;
bool isXStep = true;
int maxStep = 0;
//X、Y轴步进选择
if (Math.Abs(xDis) >= Math.Abs(yDis))
{
isXStep = true;
maxStep = Math.Abs(xDis);
}
else
{
isXStep = false;
maxStep = Math.Abs(yDis);
}
float widthMakeUp = 0f;
//斜线宽度补偿
if (start_x != end_x && start_y != end_y)
{
if (isXStep)
{
widthMakeUp = (float)(R / Math.Cos(Math.Atan(Math.Abs((double)(end_y - start_y) / (double)(end_x - start_x)))));
}
else
{
widthMakeUp = (float)(R / Math.Sin(Math.Atan(Math.Abs((double)(end_y - start_y) / (double)(end_x - start_x)))));
}
}
else
{
widthMakeUp = thickness;
}
//如果是多边形，求四边
//四条边上的已知点
float aX = 0;
float aY = 0;
float bX = 0;
float bY = 0;
float cX = 0;
float cY = 0;
float dX = 0;
float dY = 0;
if (thickness > 1)
{
if (isXStep)
{
aX = start_x;
aY = start_y + widthMakeUp;
bX = end_x;
bY = end_y + widthMakeUp;
cX = start_x;
cY = start_y - widthMakeUp;
dX = end_x;
dY = end_y - widthMakeUp;
}
else
{
aX = start_x - widthMakeUp;
aY = start_y;
bX = end_x - widthMakeUp;
bY = end_y;
cX = start_x + widthMakeUp;
cY = start_y;
dX = end_x + widthMakeUp;
dY = end_y;
}
//普通斜线段情况，重新计算4个交点
if (start_x != end_x && start_y != end_y)
{
float k = (float)(start_x - end_x) / (float)(end_y - start_y);
float b1 = start_y - k * start_x;
float b2 = end_y - k * end_x;
//线段AB
float bAB = aY + (1f / k) * aX;
//线段CD
float bCD = cY + (1f / k) * cX;
aX = (bAB - b1) / (k + 1f / k);
aY = k * aX + b1;
cX = (bCD - b1) / (k + 1f / k);
cY = k * cX + b1;
bX = (bAB - b2) / (k + 1f / k);
bY = k * bX + b2;
dX = (bCD - b2) / (k + 1f / k);
dY = k * dX + b2;
}
//创建线多边形，赋值四条边
PlanePolygon linePolygon = new PlanePolygon();
linePolygon.AddEdge(Convert.ToInt32(aX), Convert.ToInt32(aY), Convert.ToInt32(bX), Convert.ToInt32(bY));
linePolygon.AddEdge(Convert.ToInt32(aX), Convert.ToInt32(aY), Convert.ToInt32(cX), Convert.ToInt32(cY));
linePolygon.AddEdge(Convert.ToInt32(bX), Convert.ToInt32(bY), Convert.ToInt32(dX), Convert.ToInt32(dY));
linePolygon.AddEdge(Convert.ToInt32(cX), Convert.ToInt32(cY), Convert.ToInt32(dX), Convert.ToInt32(dY));
//扫描范围
int yMin = linePolygon.YMin;
int yMax = linePolygon.YMax;
//先画好水平线
List <PlaneEdge> horizonLine = linePolygon.GetHorizontalLine();
for (int i = 0; i < horizonLine.Count; i++)
{
if (horizonLine[i].x0 < horizonLine[i].x1)
{
for (int xValue = horizonLine[i].x0; xValue <= horizonLine[i].x1; xValue++)
{
SetPixelColor(draw_tex, xValue, horizonLine[i].ymin, line_color);
}
}
else
{
for (int xValue = horizonLine[i].x1; xValue <= horizonLine[i].x0; xValue++)
{
SetPixelColor(draw_tex, xValue, horizonLine[i].ymin, line_color);
}
}
}
//初始化活性边表
List <PlaneEdge> AELTable = new List <PlaneEdge>();
for (int activeY = yMin; activeY <= yMax; activeY++)
{
//加入到活性边表
List <PlaneEdge> tempAEL = linePolygon.GetAEL(activeY);
if (tempAEL.Count > 0)
{
AELTable.AddRange(tempAEL);
}
//遍历活性边表，求交点
List <int> insectP = new List <int>();
for (int i = 0; i < AELTable.Count; i++)
{
insectP.Add(Convert.ToInt32(AELTable[i].XValue(activeY)));
//删除求解完成的边
if (AELTable[i].ymax - 1 == activeY)
{
AELTable.RemoveAt(i);
i--;
}
}
//交点排序
insectP.Sort();
//填充
if (insectP.Count % 2 != 0)
{
Debug.LogWarning("交点个数不为偶数，自动删除最后一个点，图形应该有误！");
insectP.RemoveAt(insectP.Count - 1);
}
for (int i = 0; i < insectP.Count; i = i + 2)
{
for (int xValue = insectP[i]; xValue <= insectP[i + 1]; xValue++)
{
SetPixelColor(draw_tex, xValue, activeY, line_color);
}
}
}
//端点处理，以终点和起点为圆心，画圆
//起点
for (int i = start_x - R; i <= start_x + R; i++)
{
for (int j = start_y - R; j <= start_y + R; j++)
{
//判断点是否在圆内
if ((i - start_x) * (i - start_x) + (j - start_y) * (j - start_y) <= R * R)
{
SetPixelColor(draw_tex, i, j, line_color);
}
}
}
//终点
for (int i = end_x - R; i <= end_x + R; i++)
{
for (int j = end_y - R; j <= end_y + R; j++)
{
//判断点是否在圆内
if ((i - end_x) * (i - end_x) + (j - end_y) * (j - end_y) <= R * R)
{
SetPixelColor(draw_tex, i, j, line_color);
}
}
}
}
else //最细线段，因为Unity显示的问题，采用了Wu反走样算法
{
float fxUnit = (float)xDis / (float)maxStep;
float fyUnit = (float)yDis / (float)maxStep;
//设置起点终点颜色
SetPixelColor(draw_tex, start_x, start_y, line_color);
SetPixelColor(draw_tex, end_x, end_y, line_color);
float x = (float)start_x;
float y = (float)start_y;
int xInt = 0;
int yInt = 0;
for (int i = 1; i <= maxStep; i++)
{
x += fxUnit;
y += fyUnit;
xInt = (int)x;
yInt = (int)y;
//点对反走样
if (isXStep)
{
//一条线段用一对点来实现反走样
if (yInt < Convert.ToInt32(y))
{
SetPixelColor(draw_tex, Convert.ToInt32(x), yInt, line_color);
}
else
{
SetPixelColor(draw_tex, Convert.ToInt32(x), yInt + 1, line_color);
}
//1的情况，用填充算法不是很好，采用Wu反走样去填补；
if (thickness != 0)
{
thickness = Convert.ToInt32(widthMakeUp) * 2;
if (yInt < Convert.ToInt32(y))
{
for (int yValue = 0; yValue <= widthMakeUp; yValue++)
{
if (yValue % 2 == 0)
{
SetPixelColor(draw_tex, Convert.ToInt32(x), yInt + yValue / 2, line_color);
}
else
{
SetPixelColor(draw_tex, Convert.ToInt32(x), yInt - 1 - (yValue / 2), line_color);
}
}
}
else
{
for (int yValue = 0; yValue <= widthMakeUp; yValue++)
{
if (yValue % 2 == 0)
{
SetPixelColor(draw_tex, Convert.ToInt32(x), yInt - yValue / 2 - 1, line_color);
}
else
{
SetPixelColor(draw_tex, Convert.ToInt32(x), yInt + (yValue / 2), line_color);
}
}
}
}
}
else
{
//一条线段用一对点来实现反走样
if (xInt < Convert.ToInt32(x))
{
SetPixelColor(draw_tex, xInt, Convert.ToInt32(y), line_color);
}
else
{
SetPixelColor(draw_tex, xInt + 1, Convert.ToInt32(y), line_color);
}
//1的情况，用填充算法不是很好，采用Wu反走样去填补；
if (thickness != 0)
{
thickness = Convert.ToInt32(widthMakeUp) * 2;
if (xInt < Convert.ToInt32(x))
{
for (int xValue = 0; xValue <= widthMakeUp; xValue++)
{
if (xValue % 2 == 0)
{
SetPixelColor(draw_tex, xInt + xValue / 2, Convert.ToInt32(y), line_color);
}
else
{
SetPixelColor(draw_tex, xInt - 1 - (xValue / 2), Convert.ToInt32(y), line_color);
}
}
}
else
{
for (int xValue = 0; xValue <= widthMakeUp; xValue++)
{
if (xValue % 2 == 0)
{
SetPixelColor(draw_tex, xInt - xValue / 2 - 1, Convert.ToInt32(y), line_color);
}
else
{
SetPixelColor(draw_tex, xInt + (xValue / 2), Convert.ToInt32(y), line_color);
}
}
}
}
}
SetPixelColor(draw_tex, Convert.ToInt32(x), Convert.ToInt32(y), line_color);
}
}
draw_tex.Apply();
}