Alpha pixel blending completed

Co-authored-by: sigonasr2 <sigonasr2@gmail.com>

src/sig/JavaProjectTemplate.java

@@ -60,7 +60,7 @@ public class JavaProjectTemplate {
 		game.Draw(100,20,Color.BLACK);
 		game.Draw_Line(10,10,35,35,Color.BLACK);
 
-		game.Draw_Sprite(450,75,bookSpr);
+		game.Draw_Sprite(450,75,bookSpr,Color.GREEN);
 		game.Draw_Sprite(450,75+bookSpr.getHeight(),bookSpr,Transform.VERTICAL);
 
 		game.Draw_Animated_Sprite(pl.x,pl.y,pl.spr,pl.animationFrame);
@@ -68,7 +68,7 @@ public class JavaProjectTemplate {
 		game.Draw_Text(10,40,"Hello World!",Font.PROFONT_12);
 		game.Draw_Text_Ext(10,52,"Hello World 2!",Font.PROFONT_36,Color.MAGENTA);
 
-		game.Fill_Triangle(160,160,190,190,50,250,Color.RED);
+		game.Fill_Triangle(160,160,190,190,50,250,new Color(255,0,0,150));
 
 		game.FillTexturedTriangle(
 			List.of(
@@ -83,9 +83,9 @@ public class JavaProjectTemplate {
 			)
 			, 
 			List.of(
-				Color.BLUE,
+				new Color(0,0,0,0),
-				Color.BLUE,
+				Color.WHITE,
-				Color.BLUE
+				Color.RED
 			), bookSpr);
 	}
 

src/sig/engine/Panel.java

@@ -375,7 +375,11 @@ public class Panel extends JPanel implements Runnable,KeyListener {
 	}
 
 	void Draw(int index, int col) {
-		pixel[index]=col;
+		if (((col>>>24)&0xff)!=255) {
+			pixel[index]=ColorLerpNoAlpha(new Color(pixel[index]),new Color(col),((col>>>24)&0xff)/255f).getColor();
+		} else {
+			pixel[index]=col;
+		}
 	}
 
 	@Override
@@ -536,33 +540,36 @@ public class Panel extends JPanel implements Runnable,KeyListener {
     }
 
 	public void Draw_Sprite(double x, double y, Sprite sprite){
-		Draw_Sprite_Partial(x,y,0,0,sprite.getWidth(),sprite.getHeight(),sprite,0,Transform.NONE );
+		Draw_Sprite_Partial(x,y,0,0,sprite.getWidth(),sprite.getHeight(),sprite,0,Color.WHITE,Transform.NONE);
 	}
 
 	public void Draw_Animated_Sprite(double x, double y, AnimatedSprite sprite, double frameIndex){
 		Rectangle frameRectangle=sprite.getFrame((int)frameIndex);
-		Draw_Sprite_Partial(x,y,frameRectangle.getX(),frameRectangle.getY(),frameRectangle.getWidth(),frameRectangle.getHeight(),sprite,frameIndex,Transform.NONE);
+		Draw_Sprite_Partial(x,y,frameRectangle.getX(),frameRectangle.getY(),frameRectangle.getWidth(),frameRectangle.getHeight(),sprite,frameIndex,Color.WHITE,Transform.NONE);
 	}
 
+	public void Draw_Sprite(double x, double y, Sprite sprite, Color col){
+		Draw_Sprite_Partial(x,y,0,0,sprite.getWidth(),sprite.getHeight(),sprite,0,col,Transform.NONE);
+	}
 	public void Draw_Sprite(double x, double y, Sprite sprite, Transform transform){
-		Draw_Sprite_Partial(x,y,0,0,sprite.getWidth(),sprite.getHeight(),sprite,0,transform);
+		Draw_Sprite_Partial(x,y,0,0,sprite.getWidth(),sprite.getHeight(),sprite,0,Color.WHITE,transform);
 	}
-	public void Draw_Animated_Sprite(double x, double y, AnimatedSprite sprite, double frameIndex, Transform transform){
+	public void Draw_Animated_Sprite(double x, double y, AnimatedSprite sprite, double frameIndex, Color col, Transform transform){
 		Rectangle frameRectangle=sprite.getFrame((int)frameIndex);
-		Draw_Sprite_Partial(x,y,frameRectangle.getX(),frameRectangle.getY(),frameRectangle.getWidth(),frameRectangle.getHeight(),sprite,frameIndex, transform);
+		Draw_Sprite_Partial(x,y,frameRectangle.getX(),frameRectangle.getY(),frameRectangle.getWidth(),frameRectangle.getHeight(),sprite,frameIndex,col,transform);
 	}
 
-	public void Draw_Sprite_Partial(double x, double y, double xOffset, double yOffset, double w, double h, Sprite sprite, double frame_index, Transform transform){
+	public void Draw_Sprite_Partial(double x, double y, double xOffset, double yOffset, double w, double h, Sprite sprite, double frame_index, Color col, Transform transform){
-		Draw_Sprite_Partial_Ext(x,y,xOffset,yOffset,w,h,sprite,frame_index, Color.WHITE,transform);
+		Draw_Sprite_Partial_Ext(x,y,xOffset,yOffset,w,h,sprite,frame_index, col,transform);
 	}
 
-	public void Draw_Sprite_Partial_Ext(double x, double y, double xOffset, double yOffset, double w, double h, Sprite sprite, Transform transform){
+	public void Draw_Sprite_Partial_Ext(double x, double y, double xOffset, double yOffset, double w, double h, Sprite sprite, Color col, Transform transform){
-		Draw_Sprite_Partial_Ext(x, y, xOffset, yOffset, w, h, sprite, 0, Color.WHITE, transform);
+		Draw_Sprite_Partial_Ext(x, y, xOffset, yOffset, w, h, sprite, 0, col, transform);
 	}
 
-	public void Draw_Animated_Sprite_Partial_Ext(double x, double y, double xOffset, double yOffset, double w, double h, AnimatedSprite sprite, double frameIndex, Transform transform){
+	public void Draw_Animated_Sprite_Partial_Ext(double x, double y, double xOffset, double yOffset, double w, double h, AnimatedSprite sprite, double frameIndex, Color col, Transform transform){
 		Rectangle frameRectangle=sprite.getFrame((int)frameIndex);
-		Draw_Sprite_Partial_Ext(x, y, frameRectangle.getX(), frameRectangle.getY(), frameRectangle.getWidth(), frameRectangle.getHeight(), sprite, 0, Color.WHITE, transform);
+		Draw_Sprite_Partial_Ext(x, y, frameRectangle.getX(), frameRectangle.getY(), frameRectangle.getWidth(), frameRectangle.getHeight(), sprite, 0, col, transform);
 	}
 
 	public void Draw_Sprite_Partial_Ext(double x, double y, double xOffset, double yOffset, double w, double h, Sprite sprite, double frame_index, Color col, Transform transform){
@@ -585,7 +592,17 @@ public class Panel extends JPanel implements Runnable,KeyListener {
 					if (((sprite.getImg().getRGB(X,Y)>>>24)&0xFF)==0||index<0||index>=pixel.length) {
 						continue;
 					} else {
-						Draw(index,(col==Color.WHITE)?sprite.getImg().getRGB(X,Y):col.getColor());	
+						if (col==Color.WHITE) {
+							Draw(index,sprite.getImg().getRGB(X,Y));
+						} else {
+							Color img = new Color(sprite.getImg().getRGB(X,Y));
+							Draw(index,new Color(
+								(int)Math.min(255.0f,Math.max(0,(float)img.r * col.r / 255.0f)),
+								(int)Math.min(255.0f,Math.max(0,(float)img.g * col.g / 255.0f)),
+								(int)Math.min(255.0f,Math.max(0,(float)img.b * col.b / 255.0f)),
+								(int)Math.min(255.0f,Math.max(0,(float)img.a * col.a / 255.0f))).getColor()
+							);
+						}
 					}
 				}
 			}	
@@ -994,6 +1011,10 @@ public class Panel extends JPanel implements Runnable,KeyListener {
 	{ return new Color((int)((c2.r * t) + c1.r * (1.0f - t)),(int)((c2.g * t) + c1.g * (1.0f - t)),(int)((c2.b * t) + c1.b * (1.0f - t)),(int)((c2.a * t) + c1.a * (1.0f - t))); }
 
 
+	Color ColorLerpNoAlpha(Color c1, Color c2, float t)
+	{ return new Color((int)((c2.r * t) + c1.r * (1.0f - t)),(int)((c2.g * t) + c1.g * (1.0f - t)),(int)((c2.b * t) + c1.b * (1.0f - t))); }
+
+
 	public void Clear(Color col){
 		for (int y=0;y<JavaProjectTemplate.WINDOW_HEIGHT;y++) {
 			for (int x=0;x<JavaProjectTemplate.WINDOW_WIDTH;x++) {