/// <summary>
/// 填充矩形
/// </summary>
/// <param name="color">颜色</param>
/// <param name="left">左坐标</param>
/// <param name="top">上坐标</param>
/// <param name="width">填充的宽度</param>
/// <param name="height">填充的高度</param>
public override void FillRectangle(int color, int left, int top, int width, int height)
{
ImageBuilderUtil.ColorToArgb(color, out var a, out var r, out var g, out var b);
for (int v = 0; v < height; v++) //控制行
{
for (int h = 0; h < width; h++) //控制当前行的位置
{
var tempX = left + h;
var tempY = top + v;
if (tempX < 0 || tempX > Width || tempY < 0 || tempY > Height)
{
continue;
}
var index = (Width * (v + top) + (h + left)) * 4;
Data[index] = b;
Data[index + 1] = g;
Data[index + 2] = r;
Data[index + 3] = a;
}
}
}
/// <summary>
/// 绘制线段
/// </summary>
/// <param name="color"></param>
/// <param name="x1">起始x坐标</param>
/// <param name="y1">起始y坐标</param>
/// <param name="x2">终止x坐标</param>
/// <param name="y2">终止y坐标</param>
public override void DrawLine(int color, int x1, int y1, int x2, int y2)
{
ImageBuilderUtil.ColorToArgb(color, out var a, out var r, out var g, out var b);
int index = 0;
if (x1 != x2 && y1 != y2)
{
//TODO 未全面测试斜线绘制
//ColorToArgb(-65536, out a, out r, out g, out b);
int drawX = x1;
int drawY = y1;
int drawEndX = x2;
int drawEndY = y2;
//横向偏移量
float hoffset = 0;
//纵向偏移量
float voffset = 0;
var hlength = drawX - drawEndX;
var vlength = drawY - drawEndY;
int step = 0;
var hlength_abs = Math.Abs(hlength);
var vlength_abs = Math.Abs(vlength);
if (hlength_abs == vlength_abs) //斜线
{
hoffset = hlength > 0 ? -1 : 1;
voffset = vlength > 0 ? -1 : 1;
step = hlength_abs;
}
else if (hlength_abs > vlength_abs) //横向位移较大
{
hoffset = hlength > 0 ? -1 : 1;
voffset = vlength > 0 ? -vlength / hlength_abs : vlength / hlength_abs;
step = hlength_abs;
}
else //纵向位移较大
{
hoffset = hlength > 0 ? -hlength / vlength_abs : hlength / vlength_abs;
voffset = vlength > 0 ? -1 : 1;
step = vlength_abs;
}
//System.Diagnostics.Debug.WriteLine($"x1：{x1},y1：{y1}, x2：{x2}, y2：{y2}，step：{step}");
for (; step > 0; drawX = (int)(drawX + hoffset), drawY = (int)(drawY + voffset), step--)
{
index = (Width * drawY + drawX) * 4;
//System.Diagnostics.Debug.WriteLine($"step：{step}，x:{drawX},y:{drawY},index:{index}");
if (index < 0)
{
continue;
}
else if (index > Data.Length)
{
continue;
}
Data[index] = b;
Data[index + 1] = g;
Data[index + 2] = r;
Data[index + 3] = a;
}
}
else
{
//TODO 可能需要处理两个边界值问题。
if (x1 == x2)
{
var drawY = Math.Min(y1, y2);
var drawEndY = Math.Max(y1, y2);
for (; drawY < drawEndY; drawY++)
{
index = (drawY * Width + x1) * 4;
Data[index] = b;
Data[index + 1] = g;
Data[index + 2] = r;
Data[index + 3] = a;
}
}
else if (y1 == y2)
{
var drawX = Math.Min(x1, x2);
var drawEndX = Math.Max(x1, x2);
for (; drawX < drawEndX; drawX++)
{
index = (y1 * Width + drawX) * 4;
Data[index] = b;
Data[index + 1] = g;
Data[index + 2] = r;
Data[index + 3] = a;
}
}
}
}