extend.md

extend.md

+拓展代码
+================
+
+```
+/**
+ * 使图片填充屏幕
+ */
+public void centerCrop() {
+    RectF rectF = mDoodleView.getDoodleBound();
+    float scaleW = mDoodleView.getWidth() / rectF.width();
+    float scaleH = mDoodleView.getHeight() / rectF.height();
+    float scale = Math.max(scaleW, scaleH);
+    mDoodleView.setDoodleScale(scale, mDoodleView.toX(mDoodleView.getWidth() / 2), mDoodleView.toY(mDoodleView.getHeight() / 2));
+}
+```
+
+```
+/**
+ * 不跟随缩放变化的文字item
+ */
+public class FixedSizeDoodleText extends DoodleText {
+
+    float mScaleBefore;
+
+    public FixedSizeDoodleText(IDoodle doodle, String text, float size, IDoodleColor color, float x, float y) {
+        super(doodle, text, size, color, x, y);
+    }
+    @Override
+    public void setSize(float size) {
+        super.setSize(size);
+        if (getDoodle() != null) { // 记录缩放前的倍数
+            mScaleBefore = getDoodle().getDoodleScale();
+        }
+    }
+
+    @Override
+    public void doDraw(Canvas canvas) {
+        float scaleAfter = getDoodle().getDoodleScale();
+        setSize(mScaleBefore / scaleAfter * getSize()); // 缩放后重新设置大小
+        super.doDraw(canvas);
+    }
+}
+```
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