//
// Public Methods
// - - - - - - - - - - - - - - - - - - - -
// 指定した内容でチャートのビットマップをする
public Rgb24ImageBuffer CreateChart(int imageWidth, int imageHeight)
{
var buffer = new Rgb24ImageBuffer(imageWidth, imageHeight);
// 背景を塗りつぶす
for (int y = 0; y < imageHeight; y++)
{
for (int x = 0; x < imageWidth; x++)
{
buffer.SetPixel(x, y, this.BackGroundColor);
}
}
if (this.SeriesList.Count == 0)
{
return(buffer);
}
// 1点ごとの幅を表す
double bt = imageWidth / (double)this.SeriesList.Max(s => s.Values.Count);
double yd = Math.Abs(this.MinAxisY);
double baseY = this.MinAxisY + yd; // Y原点を0基準にした値
double ydist = (this.MaxAxisY + yd) - (this.MinAxisY + yd);
double yPitch = imageHeight / ydist;
this.writeGrid(imageWidth, imageHeight, buffer, yd, ydist, yPitch);
this.writeSeries(imageHeight, buffer, bt, yd, yPitch);
return(buffer);
}
//
// Private Methods
// - - - - - - - - - - - - - - - - - - - -
// チャートを描画する
private void writeSeries(int imageHeight, Rgb24ImageBuffer buffer, double bt, double yd, double yPitch)
{
foreach (Series series in this.SeriesList)
{
for (int i = 0; i < series.Values.Count; i++)
{
int point_x = (int)Math.Floor(bt * i);
int point_y = (int)Math.Floor(imageHeight - Math.Abs(yPitch * (series.Values[i] - yd)));
if (point_y >= imageHeight)
{
point_y = imageHeight - 1;
}
else if (point_y < 0)
{
point_y = 0;
}
buffer.SetPixel(point_x, point_y, series.LineColor);
}
}
}
// 罫線を引く
private void writeGrid(int imageWidth, int imageHeight, Rgb24ImageBuffer buffer, double yd, double ydist, double yPitch)
{
// Y軸の中央の高さ
int center_y = (int)Math.Floor(imageHeight - Math.Abs(yPitch * (ydist - yd)));
// 中央に線を引く
for (int x = 0; x < imageWidth; x++)
{
buffer.SetPixel(x, center_y, this.AxisColor);
}
// 中央より下側のY軸罫線
int index = 0;
while (true)
{
int y = (int)(center_y + yPitch * index * this.YGridPtich);
if (y >= imageHeight - 1)
{
break;
}
for (int x = 0; x < imageWidth; x++)
{
if (x % 7 > 2)
{
buffer.SetPixel(x, y, this.AxisColor);
}
}
index++;
}
// 中央より上側のY軸罫線
index = 0;
while (true)
{
int y = (int)(center_y - yPitch * index * this.YGridPtich);
if (y < 0)
{
break;
}
for (int x = 0; x < imageWidth; x++)
{
if (x % 7 > 2)
{
buffer.SetPixel(x, y, this.AxisColor);
}
}
index++;
}
// X軸の罫線を引く
double xPitch = imageWidth / 10;
for (int y = 0; y < imageHeight; y++)
{
for (int x = 0; x < imageWidth; x++)
{
if (x % xPitch == 0 && y % 7 > 2)
{
buffer.SetPixel(x, y, this.AxisColor);
}
}
}
}