public void DrawTile(float x, float y, float offset, float scale, uint tileNumber)
{
GL.Color4(Color4.White);
GL.BindTexture(TextureTarget.Texture2D, tileSet.Handle); // bind font texture
const uint tilesPerColumn = 10;
const uint tilesPerRow = 5;
var rect = new Rect(x + offset, y + offset, 1f - scale, 1f - scale);
var tileCoords = SpriteSheetTools.CalcTexCoords(tileNumber, tilesPerRow, tilesPerColumn);
DrawRectangleTexture(rect, tileCoords);
}
private void DrawExplosion(IEnumerable <Explosion> explosions)
{
GL.Enable(EnableCap.Texture2D);
GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
GL.Enable(EnableCap.Blend);
GL.Color4(Color4.White);
// how many sprites are in each column and row
const uint spritesPerColumn = 8;
const uint spritesPerRow = 8;
foreach (var explosion in explosions)
{
GL.BindTexture(TextureTarget.Texture2D, texExplosion.Handle);
// calculate the current frame of an animation
var spriteId = (uint)MathF.Round(explosion.NormalizedAnimationTime * (spritesPerRow * spritesPerColumn - 1));
var texCoords = SpriteSheetTools.CalcTexCoords(spriteId, spritesPerRow, spritesPerColumn);
DrawCircleTexture(explosion, texCoords);
}
GL.Disable(EnableCap.Texture2D);
GL.Disable(EnableCap.Blend);
}
private void DrawText(string text, float x, float y, float size)
{
GL.Color4(Color4.White);
const uint firstCharacter = 32; // the ASCII code of the first character stored in the bitmap font
const uint charactersPerColumn = 12; // how many characters are in each column
const uint charactersPerRow = 8; // how many characters are in each row
var rect = new Rect(x, y, size, size); // rectangle of the first character
foreach (var spriteId in SpriteSheetTools.StringToSpriteIds(text, firstCharacter))
{
//TODO: Calculate the texture coordinates of the characters letter from the bitmap font texture
//TODO: Draw a rectangle at the characters relative position
var texCoords = SpriteSheetTools.CalcTexCoords(spriteId, charactersPerRow, charactersPerColumn);
GL.BlendFunc(BlendingFactor.SrcAlpha, BlendingFactor.OneMinusSrcAlpha);
GL.Enable(EnableCap.Blend);
DrawRectangleTexture(rect, texCoords);
GL.Disable(EnableCap.Blend);
rect.MinX += rect.SizeX;
}
}