/// <summary>
/// Compiles the grid's geometry from the given <see cref="Pen"/> and overall dimensions into a <see cref="DrawCache"/> object.
/// </summary>
/// <param name="pen">The <see cref="Pen"/> to render the grid's lines with.</param>
/// <param name="left">The ledge edge of the grid.</param>
/// <param name="top">The top edge of the grid.</param>
/// <param name="width">The width of the grid.</param>
/// <param name="height">The height of the grid.</param>
/// <returns>A <see cref="DrawCache"/> with the compiled geometry.</returns>
/// <remarks>Only the most recently compiled <see cref="DrawCache"/> is valid for any given <see cref="Grid"/>.</remarks>
public DrawCache Compile(Pen pen, float left, float top, float width, float height)
{
short vIndex = 0;
short iIndex = 0;
float w2 = pen.Width / 2;
for (int y = 0; y <= _rows; y++)
{
for (int x = 0; x <= _columns; x++)
{
float px = left + (width / _columns) * x;
float py = top + (height / _rows) * y;
AddVertex(_vertexBuffer, vIndex + 0, px - w2, py - w2, pen.ColorAt(0, 0, 0));
AddVertex(_vertexBuffer, vIndex + 1, px + w2, py - w2, pen.ColorAt(0, 0, 0));
AddVertex(_vertexBuffer, vIndex + 2, px - w2, py + w2, pen.ColorAt(0, 0, 0));
AddVertex(_vertexBuffer, vIndex + 3, px + w2, py + w2, pen.ColorAt(0, 0, 0));
AddQuad(_indexBuffer, iIndex, vIndex);
vIndex += 4;
iIndex += 6;
}
}
for (int y = 0; y < _rows; y++)
{
for (int x = 0; x <= _columns; x++)
{
int baseV1 = (y * (_columns + 1) + x) * 4;
int baseV2 = ((y + 1) * (_columns + 1) + x) * 4;
AddQuad(_indexBuffer, iIndex, (short)(baseV1 + 2), (short)(baseV1 + 3), (short)(baseV2 + 0), (short)(baseV2 + 1));
iIndex += 6;
}
}
for (int y = 0; y <= _rows; y++)
{
for (int x = 0; x < _columns; x++)
{
int baseV1 = (y * (_columns + 1) + x) * 4;
int baseV2 = baseV1 + 4;
AddQuad(_indexBuffer, iIndex, (short)(baseV1 + 1), (short)(baseV2 + 0), (short)(baseV1 + 3), (short)(baseV2 + 2));
iIndex += 6;
}
}
_serial[0]++;
DrawCache cache = new DrawCache();
cache.AddUnit(new GridCacheUnit(_vertexBuffer, _indexBuffer, pen.Brush.Texture, _serial));
return(cache);
}
/// <summary>
/// Compiles the grid's geometry from the given <see cref="Pen"/> and overall dimensions into a <see cref="DrawCache"/> object.
/// </summary>
/// <param name="pen">The <see cref="Pen"/> to render the grid's lines with.</param>
/// <param name="left">The ledge edge of the grid.</param>
/// <param name="top">The top edge of the grid.</param>
/// <param name="width">The width of the grid.</param>
/// <param name="height">The height of the grid.</param>
/// <returns>A <see cref="DrawCache"/> with the compiled geometry.</returns>
/// <remarks>Only the most recently compiled <see cref="DrawCache"/> is valid for any given <see cref="Grid"/>.</remarks>
public DrawCache Compile (Pen pen, float left, float top, float width, float height)
{
short vIndex = 0;
short iIndex = 0;
float w2 = pen.Width / 2;
for (int y = 0; y <= _rows; y++) {
for (int x = 0; x <= _columns; x++) {
float px = left + (width / _columns) * x;
float py = top + (height / _rows) * y;
AddVertex(_vertexBuffer, vIndex + 0, px - w2, py - w2, pen.ColorAt(0, 0, 0));
AddVertex(_vertexBuffer, vIndex + 1, px + w2, py - w2, pen.ColorAt(0, 0, 0));
AddVertex(_vertexBuffer, vIndex + 2, px - w2, py + w2, pen.ColorAt(0, 0, 0));
AddVertex(_vertexBuffer, vIndex + 3, px + w2, py + w2, pen.ColorAt(0, 0, 0));
AddQuad(_indexBuffer, iIndex, vIndex);
vIndex += 4;
iIndex += 6;
}
}
for (int y = 0; y < _rows; y++) {
for (int x = 0; x <= _columns; x++) {
int baseV1 = (y * (_columns + 1) + x) * 4;
int baseV2 = ((y + 1) * (_columns + 1) + x) * 4;
AddQuad(_indexBuffer, iIndex, (short)(baseV1 + 2), (short)(baseV1 + 3), (short)(baseV2 + 0), (short)(baseV2 + 1));
iIndex += 6;
}
}
for (int y = 0; y <= _rows; y++) {
for (int x = 0; x < _columns; x++) {
int baseV1 = (y * (_columns + 1) + x) * 4;
int baseV2 = baseV1 + 4;
AddQuad(_indexBuffer, iIndex, (short)(baseV1 + 1), (short)(baseV2 + 0), (short)(baseV1 + 3), (short)(baseV2 + 2));
iIndex += 6;
}
}
_serial[0]++;
DrawCache cache = new DrawCache();
cache.AddUnit(new GridCacheUnit(_vertexBuffer, _indexBuffer, pen.Brush.Texture, _serial));
return cache;
}
