add engine/ui

	- interfaces Drawable and Touchable
	- basic ui widgets

9 files changed, 523 insertions, 0 deletions

diff --git a/core/src/ch/asynk/zproject/engine/Drawable.java b/core/src/ch/asynk/zproject/engine/Drawable.java
new file mode 100644
index 0000000..ca5fe91
--- /dev/null
+++ b/core/src/ch/asynk/zproject/engine/Drawable.java
@@ -0,0 +1,19 @@
+package ch.asynk.zproject.engine;
+
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+
+public interface Drawable
+{
+    public float getX();
+    public float getY();
+    public float getWidth();
+    public float getHeight();
+    public float getInnerX();
+    public float getInnerY();
+    public float getInnerWidth();
+    public float getInnerHeight();
+    public void draw(Batch batch);
+    default public void drawDebug(ShapeRenderer debugShapes) { }
+    public void setPosition(float x, float y, float w, float h);
+}
diff --git a/core/src/ch/asynk/zproject/engine/Touchable.java b/core/src/ch/asynk/zproject/engine/Touchable.java
new file mode 100644
index 0000000..b486aca
--- /dev/null
+++ b/core/src/ch/asynk/zproject/engine/Touchable.java
@@ -0,0 +1,6 @@
+package ch.asynk.zproject.engine;
+
+public interface Touchable
+{
+    public boolean touch(float x, float y);
+}
diff --git a/core/src/ch/asynk/zproject/engine/ui/Alignment.java b/core/src/ch/asynk/zproject/engine/ui/Alignment.java
new file mode 100644
index 0000000..385b419
--- /dev/null
+++ b/core/src/ch/asynk/zproject/engine/ui/Alignment.java
@@ -0,0 +1,168 @@
+package ch.asynk.zproject.engine.ui;
+
+public enum Alignment
+{
+    ABSOLUTE,           // Root
+    RELATIVE,           // Default
+    TOP_LEFT,
+    TOP_RIGHT,
+    TOP_CENTER,
+    MIDDLE_LEFT,
+    MIDDLE_RIGHT,
+    MIDDLE_CENTER,
+    BOTTOM_LEFT,
+    BOTTOM_RIGHT,
+    BOTTOM_CENTER;
+
+    public Alignment verticalMirror()
+    {
+        switch(this) {
+            case TOP_LEFT:
+                return TOP_RIGHT;
+            case MIDDLE_LEFT:
+                return MIDDLE_RIGHT;
+            case BOTTOM_LEFT:
+                return BOTTOM_RIGHT;
+            case TOP_RIGHT:
+                return TOP_LEFT;
+            case MIDDLE_RIGHT:
+                return MIDDLE_LEFT;
+            case BOTTOM_RIGHT:
+                return BOTTOM_LEFT;
+        }
+        return this;
+    }
+
+    public Alignment horizontalMirror()
+    {
+        switch(this) {
+            case TOP_LEFT:
+                return BOTTOM_LEFT;
+            case TOP_CENTER:
+                return BOTTOM_CENTER;
+            case TOP_RIGHT:
+                return BOTTOM_RIGHT;
+            case BOTTOM_LEFT:
+                return TOP_LEFT;
+            case BOTTOM_CENTER:
+                return TOP_CENTER;
+            case BOTTOM_RIGHT:
+                return TOP_RIGHT;
+        }
+        return this;
+    }
+
+    public boolean isTop()
+    {
+        switch(this) {
+            case TOP_LEFT:
+            case TOP_CENTER:
+            case TOP_RIGHT:
+                return true;
+        }
+        return false;
+    }
+
+    public boolean isMiddle()
+    {
+        boolean r = false;
+        switch(this) {
+            case MIDDLE_LEFT:
+            case MIDDLE_CENTER:
+            case MIDDLE_RIGHT:
+                return true;
+        }
+        return false;
+    }
+
+    public boolean isBottom()
+    {
+        boolean r = false;
+        switch(this) {
+            case BOTTOM_LEFT:
+            case BOTTOM_CENTER:
+            case BOTTOM_RIGHT:
+                return true;
+        }
+        return false;
+    }
+
+    public boolean isLeft()
+    {
+        boolean r = false;
+        switch(this) {
+            case TOP_LEFT:
+            case MIDDLE_LEFT:
+            case BOTTOM_LEFT:
+                return true;
+        }
+        return false;
+    }
+
+    public boolean isRight()
+    {
+        boolean r = false;
+        switch(this) {
+            case TOP_RIGHT:
+            case MIDDLE_RIGHT:
+            case BOTTOM_RIGHT:
+                return true;
+        }
+        return false;
+    }
+
+    public boolean isCenter()
+    {
+        switch(this) {
+            case TOP_CENTER:
+            case MIDDLE_CENTER:
+            case BOTTOM_CENTER:
+                return true;
+        }
+        return false;
+    }
+
+    public float getX(Element element, float width)
+    {
+        float x = element.getInnerX();
+        switch(this) {
+            case TOP_LEFT:
+            case MIDDLE_LEFT:
+            case BOTTOM_LEFT:
+                break;
+            case TOP_CENTER:
+            case MIDDLE_CENTER:
+            case BOTTOM_CENTER:
+                x += ((element.getInnerWidth() - width) / 2);
+                break;
+            case TOP_RIGHT:
+            case MIDDLE_RIGHT:
+            case BOTTOM_RIGHT:
+                x += (element.getInnerWidth() - width);
+                break;
+        }
+        return x;
+    }
+
+    public float getY(Element element, float height)
+    {
+        float y = element.getInnerY();
+        switch(this) {
+            case TOP_LEFT:
+            case TOP_CENTER:
+            case TOP_RIGHT:
+                y += (element.getInnerHeight() - height);
+                break;
+            case MIDDLE_LEFT:
+            case MIDDLE_CENTER:
+            case MIDDLE_RIGHT:
+                y += ((element.getInnerHeight() - height) / 2);
+                break;
+            case BOTTOM_LEFT:
+            case BOTTOM_CENTER:
+            case BOTTOM_RIGHT:
+                break;
+        }
+        return y;
+    }
+}
diff --git a/core/src/ch/asynk/zproject/engine/ui/Assembly.java b/core/src/ch/asynk/zproject/engine/ui/Assembly.java
new file mode 100644
index 0000000..a8f00ab
--- /dev/null
+++ b/core/src/ch/asynk/zproject/engine/ui/Assembly.java
@@ -0,0 +1,53 @@
+package ch.asynk.zproject.engine.ui;
+
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+
+import ch.asynk.zproject.engine.util.IterableSet;
+
+public abstract class Assembly extends Element
+{
+    private IterableSet<Element> children;
+
+    public Assembly(int c)
+    {
+        this.children = new IterableSet<Element>(c);
+    }
+
+    public void add(Element e)
+    {
+        if (children.add(e)) {
+            e.setParent(this);
+        }
+    }
+
+    public void remove(Element e)
+    {
+        if (children.remove(e)) {
+            e.setParent(null);
+        }
+    }
+
+    @Override public boolean touch(float x, float y)
+    {
+        for (Element e : children)
+            if (e.touch(x, y))
+                return true;
+        return false;
+    }
+
+    @Override public void update()
+    {
+        children.forEach( c -> c.update() );
+    }
+
+    @Override public void draw(Batch batch)
+    {
+        children.forEach( c -> c.draw(batch) );
+    }
+
+    @Override public void drawDebug(ShapeRenderer debugShapes)
+    {
+        children.forEach( c -> c.drawDebug(debugShapes) );
+    }
+}
diff --git a/core/src/ch/asynk/zproject/engine/ui/Button.java b/core/src/ch/asynk/zproject/engine/ui/Button.java
new file mode 100644
index 0000000..54f4314
--- /dev/null
+++ b/core/src/ch/asynk/zproject/engine/ui/Button.java
@@ -0,0 +1,65 @@
+package ch.asynk.zproject.engine.ui;
+
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.graphics.g2d.BitmapFont;
+import com.badlogic.gdx.graphics.g2d.NinePatch;
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+
+public class Button extends Patch
+{
+    private Label label;
+    private float spacing;
+
+    public Button(BitmapFont font, NinePatch patch)
+    {
+        this(font, patch, 0, 0);
+    }
+
+    public Button(BitmapFont font, NinePatch patch, float padding, float spacing)
+    {
+        super(patch);
+        this.padding = padding;
+        this.spacing = spacing;
+        label = new Label(font);
+        label.setParent(this);
+        label.setAlignment(Alignment.MIDDLE_CENTER);
+    }
+
+    public void write(String text)
+    {
+        write(text, getX(), getY());
+    }
+
+    public void write(String text, float x, float y)
+    {
+        label.write(text, x, y);
+    }
+
+    public void setLabelAlignment(Alignment alignment)
+    {
+        label.setAlignment(alignment);
+    }
+
+    @Override public void update()
+    {
+        label.preUpdate();      // compute width and height
+        rect.width = label.getWidth() + 2 * (padding + spacing);
+        rect.height = label.getHeight() + 2 * (padding + spacing);
+        super.update();
+        label.doUpdate();       // compute x and y
+        label.postUpdate();     // compute fx and fy
+    }
+
+    @Override public void draw(Batch batch)
+    {
+        if (!visible) return;
+        super.draw(batch);
+        label.draw(batch);
+    }
+
+    @Override public void drawDebug(ShapeRenderer debugShapes)
+    {
+        super.drawDebug(debugShapes);
+        label.drawDebug(debugShapes);
+    }
+}
diff --git a/core/src/ch/asynk/zproject/engine/ui/Element.java b/core/src/ch/asynk/zproject/engine/ui/Element.java
new file mode 100644
index 0000000..5fb4ed7
--- /dev/null
+++ b/core/src/ch/asynk/zproject/engine/ui/Element.java
@@ -0,0 +1,112 @@
+package ch.asynk.zproject.engine.ui;
+
+import com.badlogic.gdx.graphics.glutils.ShapeRenderer;
+import com.badlogic.gdx.math.Rectangle;
+
+import ch.asynk.zproject.engine.Drawable;
+import ch.asynk.zproject.engine.Touchable;
+
+public abstract class Element implements Drawable, Touchable
+{
+    public boolean blocked;
+    public boolean visible;
+    protected float padding;
+    protected Element parent;
+    protected Alignment alignment;
+    protected Rectangle rect;           // drawing coordinates
+    protected float x, y;               // given position
+
+    protected Element()
+    {
+        this.blocked = false;
+        this.visible = true;
+        this.padding = 0;
+        this.rect = new Rectangle(0, 0, 0, 0);
+        this.parent = null;
+        this.alignment = alignment.RELATIVE;
+        this.x = this.y = 0;
+    }
+
+    @Override public final float getX()        { return rect.x; }
+    @Override public final float getY()        { return rect.y; }
+    @Override public final float getWidth()    { return rect.width; }
+    @Override public final float getHeight()   { return rect.height; }
+
+    @Override public final float getInnerX()              { return rect.x + padding; }
+    @Override public final float getInnerY()              { return rect.y + padding; }
+    @Override public final float getInnerWidth()          { return rect.width - 2 * padding; }
+    @Override public final float getInnerHeight()         { return rect.height - 2 * padding; }
+
+    @Override public void drawDebug(ShapeRenderer debugShapes)
+    {
+        debugShapes.rect(getX(), getY(), getWidth(), getHeight());
+    }
+
+    @Override public boolean touch(float x, float y)
+    {
+        if (blocked || !visible) return false;
+        return rect.contains(x, y);
+    }
+
+    @Override public void setPosition(float x, float y, float w, float h)
+    {
+        this.x = x;
+        this.y = y;
+        rect.width = w;
+        rect.height = h;
+        // rect.set(rec.x, y, w, h);
+    }
+
+    public void setParent(Element parent)
+    {
+        this.parent = parent;
+    }
+
+    public void setPadding(float padding)
+    {
+        this.padding = padding;
+    }
+
+    public void setAlignment(Alignment alignment)
+    {
+        this.alignment = alignment;
+    }
+
+    public final void translate(float dx, float dy)
+    {
+        setPosition(x + dx, y + dy);
+    }
+
+    public final void setPosition(Rectangle r)
+    {
+        setPosition(r.x, r.x, r.width, r.height);
+    }
+
+    public final void setPosition(float x, float y)
+    {
+       setPosition(x, y, rect.width, rect.height);
+    }
+
+    protected void preUpdate() { }
+    protected void postUpdate() { }
+    protected void doUpdate()
+    {
+        if (alignment == Alignment.ABSOLUTE || parent == null) {
+            rect.x = x;
+            rect.y = y;
+        } else if (alignment == Alignment.RELATIVE) {
+            rect.x  = x + parent.getInnerX();
+            rect.y = y + parent.getInnerX();
+        } else {
+            rect.x = x + alignment.getX(parent, rect.width);
+            rect.y = y + alignment.getY(parent, rect.height);
+        }
+    }
+
+    public void update()
+    {
+        preUpdate();
+        doUpdate();
+        postUpdate();
+    }
+}
diff --git a/core/src/ch/asynk/zproject/engine/ui/Label.java b/core/src/ch/asynk/zproject/engine/ui/Label.java
new file mode 100644
index 0000000..6b6b65e
--- /dev/null
+++ b/core/src/ch/asynk/zproject/engine/ui/Label.java
@@ -0,0 +1,62 @@
+package ch.asynk.zproject.engine.ui;
+
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.graphics.g2d.BitmapFont;
+import com.badlogic.gdx.graphics.g2d.GlyphLayout;
+
+public class Label extends Element
+{
+    private BitmapFont font;
+    private GlyphLayout layout;
+    private float fx;
+    private float fy;
+    private String text;
+
+    public Label(BitmapFont font)
+    {
+        this(font, 0);
+    }
+
+    public Label(BitmapFont font, float padding)
+    {
+        this(font, padding, Alignment.RELATIVE);
+    }
+
+    public Label(BitmapFont font, float padding, Alignment alignment)
+    {
+        super();
+        this.font = font;
+        this.padding = padding;
+        this.alignment = alignment;
+        this.layout = new GlyphLayout();
+    }
+
+    public void write(String text)
+    {
+        write(text, getX(), getY());
+    }
+
+    public void write(String text, float x, float y)
+    {
+        this.text = text;
+        setPosition(x, y);
+    }
+
+    @Override protected void preUpdate()
+    {
+        this.layout.setText(font, (text == null) ? "" : text);
+        super.setPosition(x, y, (layout.width + (2 * padding)), (layout.height + (2 * padding)));
+    }
+
+    @Override protected void postUpdate()
+    {
+        fx = getInnerX();
+        fy = getInnerY() + layout.height;
+    }
+
+    @Override public void draw(Batch batch)
+    {
+        if (!visible) return;
+        font.draw(batch, layout, fx, fy);
+    }
+}
diff --git a/core/src/ch/asynk/zproject/engine/ui/Patch.java b/core/src/ch/asynk/zproject/engine/ui/Patch.java
new file mode 100644
index 0000000..cf9ed4f
--- /dev/null
+++ b/core/src/ch/asynk/zproject/engine/ui/Patch.java
@@ -0,0 +1,22 @@
+package ch.asynk.zproject.engine.ui;
+
+import com.badlogic.gdx.graphics.g2d.Batch;
+import com.badlogic.gdx.graphics.g2d.NinePatch;
+
+public class Patch extends Element
+{
+    private NinePatch patch;
+
+    public Patch(NinePatch patch)
+    {
+        super();
+        this.patch = patch;
+        setPosition(0, 0, patch.getTotalWidth(), patch.getTotalHeight());
+    }
+
+    @Override public void draw(Batch batch)
+    {
+        if (!visible) return;
+        patch.draw(batch, getX(), getY(), getWidth(), getHeight());
+    }
+}
diff --git a/core/src/ch/asynk/zproject/engine/ui/Root.java b/core/src/ch/asynk/zproject/engine/ui/Root.java
new file mode 100644
index 0000000..02eb251
--- /dev/null
+++ b/core/src/ch/asynk/zproject/engine/ui/Root.java
@@ -0,0 +1,16 @@
+package ch.asynk.zproject.engine.ui;
+
+public class Root extends Assembly
+{
+    public Root(int c)
+    {
+        super(c);
+        this.alignment = Alignment.ABSOLUTE;
+    }
+
+    public void resize(float width, float height)
+    {
+        setPosition(0, 0, width, height);
+        update();
+    }
+}