Android ++

DEV-4.5/TP05/Reticule/app/build.gradle

@@ -7,8 +7,8 @@ android {
 
     defaultConfig {
         applicationId "com.example.reticule"
-        minSdk 19
-        targetSdk 32
+        minSdk 21
+        targetSdk 33
         versionCode 1
         versionName "1.0"
 

DEV-4.5/TP05/Reticule/app/src/main/java/com/example/reticule/MainActivity.java

@@ -11,4 +11,11 @@ public class MainActivity extends AppCompatActivity {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
     }
+
+    @Override
+    protected void onResume() {
+        super.onResume();
+        ReticuleView rv = (ReticuleView) findViewById(R.id.mimemamomou);
+        rv.setOnTouchListener(new ReticuleMovementListener());
+    }
 }

DEV-4.5/TP05/Reticule/app/src/main/java/com/example/reticule/ReticuleMovementListener.java

@@ -1,2 +1,37 @@
-package com.example.reticule;public class ReticuleMovementListener {
+package com.example.reticule;
+
+import android.view.DragEvent;
+import android.view.GestureDetector;
+import android.view.MotionEvent;
+import android.view.View;
+
+public class ReticuleMovementListener implements View.OnTouchListener {
+
+    private MotionEvent.PointerCoords pc = new MotionEvent.PointerCoords();
+    private float cx, cy;
+
+    @Override
+    public boolean onTouch(View view, MotionEvent motionEvent) {
+        ReticuleView v = (ReticuleView) view;
+
+        switch (motionEvent.getActionMasked()) {
+            case MotionEvent.ACTION_DOWN:
+                motionEvent.getPointerCoords(motionEvent.getActionIndex(), pc);
+                cx = v.getCx();
+                cy = v.getCy();
+                break;
+
+            case MotionEvent.ACTION_MOVE:
+                MotionEvent.PointerCoords npc = new MotionEvent.PointerCoords();
+                motionEvent.getPointerCoords(motionEvent.getActionIndex(), npc);
+
+                float dx = npc.x - pc.x;
+                float dy = npc.y - pc.y;
+                v.setCx(cx + dx);
+                v.setCy(cy + dy);
+                break;
+        }
+
+        return true;
+    }
 }

DEV-4.5/TP05/Reticule/app/src/main/java/com/example/reticule/ReticuleView.java

@@ -1,2 +1,62 @@
-package com.example.reticule;public class ReticuleView {
+package com.example.reticule;
+
+import android.content.Context;
+import android.graphics.Canvas;
+import android.graphics.Paint;
+import android.util.AttributeSet;
+import android.view.View;
+
+import androidx.annotation.Nullable;
+
+public class ReticuleView extends View {
+
+    private float cx, cy;
+    private final int radius = 15;
+    private Paint backgroundPaint, crosshairPaint;
+
+    public ReticuleView(Context context, @Nullable AttributeSet attrs) {
+        super(context, attrs);
+
+        cx = getWidth() / 2;
+        cy = getHeight() / 2;
+
+        crosshairPaint = new Paint();
+        crosshairPaint.setStyle(Paint.Style.STROKE);
+        crosshairPaint.setColor(0xFFFF9900);
+
+        backgroundPaint = new Paint();
+        backgroundPaint.setStyle(Paint.Style.FILL);
+        backgroundPaint.setColor(0xFF888888);
+    }
+
+    private double distance(float x, float y) {
+        return Math.sqrt(Math.pow(x - cx, 2) + Math.pow(y - cy, 2));
+    }
+
+    @Override
+    protected void onDraw(Canvas canvas) {
+        super.onDraw(canvas);
+        canvas.drawRect(0, 0, getWidth(), getHeight(), backgroundPaint);
+        canvas.drawCircle(cx, cy, 15, crosshairPaint);
+        canvas.drawLine(cx - 20, cy, cx + 20, cy, crosshairPaint);
+        canvas.drawLine(cx, cy - 20, cx, cy + 20, crosshairPaint);
+    }
+
+    public void setCx(float cx) {
+        this.cx = cx;
+        invalidate();
+    }
+
+    public void setCy(float cy) {
+        this.cy = cy;
+        invalidate();
+    }
+
+    public float getCx() {
+        return cx;
+    }
+
+    public float getCy() {
+        return cy;
+    }
 }

DEV-4.5/TP05/Reticule/app/src/main/res/layout/activity_main.xml

@@ -6,13 +6,9 @@
     android:layout_height="match_parent"
     tools:context=".MainActivity">
 
-    <TextView
-        android:layout_width="wrap_content"
-        android:layout_height="wrap_content"
-        android:text="Hello World!"
-        app:layout_constraintBottom_toBottomOf="parent"
-        app:layout_constraintEnd_toEndOf="parent"
-        app:layout_constraintStart_toStartOf="parent"
-        app:layout_constraintTop_toTopOf="parent" />
+    <com.example.reticule.ReticuleView
+        android:id="@+id/mimemamomou"
+        android:layout_width="match_parent"
+        android:layout_height="match_parent"/>
 
 </androidx.constraintlayout.widget.ConstraintLayout>