examples: add buttons demo

Author: bvlj

example/src/main/java/jtamaro/example/interaction/ButtonsDemo.java

@@ -0,0 +1,92 @@
+package jtamaro.example.interaction;
+
+import jtamaro.data.Sequence;
+import jtamaro.graphic.Actionable;
+import jtamaro.graphic.Graphic;
+import jtamaro.interaction.KeyboardKey;
+
+import static jtamaro.data.Sequences.of;
+import static jtamaro.example.Toolbelt.aboves;
+import static jtamaro.example.Toolbelt.besides;
+import static jtamaro.example.Toolbelt.hgap;
+import static jtamaro.example.Toolbelt.vgap;
+import static jtamaro.graphic.Colors.BLACK;
+import static jtamaro.graphic.Colors.WHITE;
+import static jtamaro.graphic.Fonts.SANS_SERIF;
+import static jtamaro.graphic.Graphics.above;
+import static jtamaro.graphic.Graphics.overlay;
+import static jtamaro.graphic.Graphics.rectangle;
+import static jtamaro.graphic.Graphics.text;
+import static jtamaro.io.IO.interact;
+
+public class ButtonsDemo {
+
+  public record Button(String label) {
+
+    public Graphic render() {
+      final Graphic graphic = overlay(
+          text(label, SANS_SERIF, 10, WHITE),
+          rectangle(200, 50, BLACK)
+      );
+
+      return new Actionable<Model>(graphic)
+          .withMousePressHandler(((model, coordinate, button) -> model.setChoice(label)))
+          .asGraphic();
+    }
+  }
+
+  public record Model(
+      String choice,
+      String previousChoice,
+      Sequence<Button> buttons
+  ) {
+
+    public static Model initialModel() {
+      return new Model(
+          "???",
+          "???",
+          of(
+              new Button("DOG"),
+              new Button("CAT")
+          )
+      );
+    }
+
+    public Model setChoice(String newChoice) {
+      return new Model(newChoice, this.choice, this.buttons);
+    }
+
+    public Graphic render() {
+      final Graphic header = aboves(of(
+          text("Current choice: " + this.choice, SANS_SERIF, 30, BLACK),
+          vgap(10),
+          text("Previous choice: " + this.previousChoice, SANS_SERIF, 20, BLACK),
+          vgap(20)
+      ));
+      final Graphic buttons = besides(
+          this.buttons
+              .map(Button::render)
+              .intersperse(hgap(20))
+      );
+      final Graphic foreground = above(header, buttons);
+      final Graphic background = rectangle(500, 400, WHITE);
+      return overlay(
+          foreground,
+          background
+      );
+    }
+  }
+
+  public static Model handleKey(Model model, KeyboardKey key) {
+    return key.keyChar() == ' '
+        ? Model.initialModel()
+        : model;
+  }
+
+  public static void main(String[] args) {
+    interact(Model.initialModel())
+        .withKeyPressHandler(ButtonsDemo::handleKey)
+        .withRenderer(Model::render)
+        .run();
+  }
+}

example/src/main/java/jtamaro/example/interaction/ColorPickerDemo.java

@@ -171,7 +171,7 @@ private static Model onKeyEvent(Model model, KeyboardKey key) {
 
   private static Model onDrag(Model m, Coordinate coords, MouseButton button) {
     final double x = coords.x() / RADIUS;
-    final double y = -coords.y() / RADIUS;
+    final double y = coords.y() / RADIUS;
     final double angle = Math.toDegrees(Math.atan2(y, x));
     final double h = angle < 0 ? angle + 360.0 : angle;
     final double s = Math.hypot(x, y);

example/src/main/java/jtamaro/example/interaction/DrawingDemo.java

@@ -18,20 +18,23 @@
 public final class DrawingDemo {
 
   static Graphic renderDrawing(Drawing drawing) {
-    CartesianWorld world = drawing.points().reduce(
+    final CartesianWorld world = drawing.points().reduce(
         new CartesianWorld(),
         (point, w) -> w.place(point.x(), point.y(), ellipse(10, 10, BLUE))
     ).place(0, 0, rectangle(400, 200, WHITE));
+
     return new Actionable<Drawing>(world.asGraphic())
-        .withMouseDragHandler((Drawing d, Coordinate c, MouseButton b) -> {
-          System.out.println("mouse drag " + c);
-          return d.addPoint(new Point(c.x(), c.y()));
-        })
+        .withMouseDragHandler((Drawing d, Coordinate c, MouseButton b) ->
+            d.addPoint(new Point(c.x(), c.y())))
         .asGraphic();
   }
 
-  record Point(double x, double y) {}
+  record Point(double x, double y) {
+
+  }
+
   record Drawing(Sequence<Point> points) {
+
     public Drawing addPoint(Point p) {
       return new Drawing(cons(p, points));
     }

example/src/main/java/jtamaro/example/interaction/TextFieldDemo.java

@@ -19,7 +19,6 @@
 import static jtamaro.graphic.Graphics.rotate;
 import static jtamaro.graphic.Graphics.text;
 import static jtamaro.io.IO.interact;
-import static jtamaro.io.IO.println;
 
 public class TextFieldDemo {
 
@@ -74,7 +73,6 @@ TextField moveCursor(int idx) {
 
   // Event handling
   private static TextField tick(TextField textField) {
-    println("TICK:" + textField);
     return textField.blinkCursor();
   }