(#10, #32) added Polygon2DBuilder

src/main/java/tech/fastj/graphics/game/Polygon2DBuilder.java

@@ -0,0 +1,74 @@
+package tech.fastj.graphics.game;
+
+import tech.fastj.math.Pointf;
+import tech.fastj.graphics.RenderStyle;
+import tech.fastj.graphics.Transform2D;
+
+import java.awt.Color;
+import java.awt.Paint;
+import java.awt.Stroke;
+import java.util.Objects;
+
+public class Polygon2DBuilder {
+
+    private final Pointf[] points;
+    private final boolean shouldRender;
+    private final RenderStyle renderStyle;
+
+    private Paint fillPaint = Polygon2D.DefaultPaint;
+    private Stroke outlineStroke = Polygon2D.DefaultOutlineStroke;
+    private Color outlineColor = Polygon2D.DefaultOutlineColor;
+
+    private Pointf translation = Transform2D.DefaultTranslation.copy();
+    private float rotation = Transform2D.DefaultRotation;
+    private Pointf scale = Transform2D.DefaultScale.copy();
+
+    Polygon2DBuilder(Pointf[] points, RenderStyle renderStyle, boolean shouldRender) {
+        this.points = Objects.requireNonNull(points, "The array of points must not be null.");
+        this.renderStyle = Objects.requireNonNull(renderStyle, "The render style must not be null.");
+        this.shouldRender = shouldRender;
+    }
+
+    public Polygon2DBuilder withFill(Paint fillPaint) {
+        this.fillPaint = Objects.requireNonNull(fillPaint, "The fill must not be null.");
+        return this;
+    }
+
+    public Polygon2DBuilder withOutline(Stroke outlineStroke, Color outlineColor) {
+        this.outlineStroke = Objects.requireNonNull(outlineStroke, "The outline stroke must not be null.");
+        this.outlineColor = Objects.requireNonNull(outlineColor, "The outline color must not be null.");
+        return this;
+    }
+
+    public Polygon2DBuilder withTransform(Pointf translation, float rotation, Pointf scale) {
+        this.translation = Objects.requireNonNull(translation, "The translation value must not be null.");
+        this.scale = Objects.requireNonNull(scale, "The scale value must not be null.");
+        if (Float.isNaN(rotation)) {
+            throw new NumberFormatException("The rotation value must not be NaN.");
+        }
+        this.rotation = rotation;
+        return this;
+    }
+
+    public Polygon2D build() {
+        Polygon2D polygon2D = (Polygon2D) new Polygon2D(points)
+                .setRenderStyle(renderStyle)
+                .setShouldRender(shouldRender)
+                .setTransform(translation, rotation, scale);
+
+        switch (renderStyle) {
+            case Fill: {
+                return polygon2D.setFill(fillPaint);
+            }
+            case Outline: {
+                return polygon2D.setOutline(outlineStroke, outlineColor);
+            }
+            case FillAndOutline: {
+                return polygon2D.setFill(fillPaint).setOutline(outlineStroke, outlineColor);
+            }
+            default: {
+                throw new IllegalStateException("Invalid render style: " + renderStyle.name());
+            }
+        }
+    }
+}