Android ShapeDrawableインスタンス
今日apiの中の絵図を見て、1つの新しいクラスに出会って、Shaderクラスの紹介、androidの中でShaderクラスを提供して画像をレンダリングするためにすでにいくつかの幾何学の図形を提供して、shaderの下でいくつかの直接のサブクラスを含んで、それぞれBitmapShaper、ComposeShader、LinerGradient、RadialGradient、SweepGradient.BitmapShaderは主に画像をレンダリングするために使用され、Shaderクラスの使用は、Shdaerオブジェクトを構築してから、ペイントのsetShaderメソッドでレンダリングオブジェクトを設定してから、ペイントして使用することができます.
import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.ComposePathEffect;
import android.graphics.CornerPathEffect;
import android.graphics.DiscretePathEffect;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.Path;
import android.graphics.PathEffect;
import android.graphics.RectF;
import android.graphics.Shader;
import android.graphics.SweepGradient;
import android.graphics.drawable.Drawable;
import android.graphics.drawable.ShapeDrawable;
import android.graphics.drawable.shapes.ArcShape;
import android.graphics.drawable.shapes.OvalShape;
import android.graphics.drawable.shapes.PathShape;
import android.graphics.drawable.shapes.RectShape;
import android.graphics.drawable.shapes.RoundRectShape;
import android.graphics.drawable.shapes.Shape;
import android.os.Bundle;
import android.view.View;
public class ShapeDrawble1 extends Activity {
/** Called when the activity is first created. */
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(new SampleView(this));
}
private static class SampleView extends View {
private ShapeDrawable[] mDrawables;
private static Shader makeSweep() {
/* SweepGradient Shader , (150,25)
* */
return new SweepGradient(0, 0,
new int[] { 0xFFFF0000, 0xFF00FF00, 0xFF0000FF, 0xFFFF0000 },
null);// null
}
private static Shader makeLinear() {
//
return new LinearGradient(100, 100, 0, 0,
new int[] { 0xFFFF0000, 0xFF00FF00, 0xFF0000FF },
null, Shader.TileMode.MIRROR);
}
private static Shader makeTiling() {
int[] pixels = new int[] { 0xFFFF0000, 0xFF00FF00, 0xFF0000FF, 0};
Bitmap bm = Bitmap.createBitmap(pixels, 1, 1,
Bitmap.Config.ARGB_8888);
/**
* BitmapShader ,
* x,y bm
*
*/
return new BitmapShader(bm, Shader.TileMode.REPEAT,
Shader.TileMode.REPEAT);
}
/**
* ShapeDrawable 。 shap
* , , draw(canvas)
* onDraw(Shape,Canvas,Paint)
*
*/
private static class MyShapeDrawable extends ShapeDrawable {
//Paint.ANTI_ALIAS_FLAG
private Paint mStrokePaint = new Paint(Paint.ANTI_ALIAS_FLAG);
public MyShapeDrawable(Shape s) {
super(s);
mStrokePaint.setStyle(Paint.Style.STROKE);
}
public Paint getStrokePaint() {
return mStrokePaint;
}
@Override protected void onDraw(Shape s, Canvas c, Paint p) {
//
s.draw(c, p);
//
s.draw(c, mStrokePaint);
}
}
public SampleView(Context context) {
super(context);
setFocusable(true);
// ,
float[] outerR = new float[] { 12, 12, 12, 12, 0, 0, 0, 0 };
//
RectF inset = new RectF(6, 6, 6, 6);
// ,
float[] innerR = new float[] { 12, 12, 0, 0, 12, 12, 0, 0 };
//
Path path = new Path();
path.moveTo(50, 0);
path.lineTo(0, 50);
path.lineTo(50, 100);
path.lineTo(100, 50);
//
path.close();
mDrawables = new ShapeDrawable[7];
//
mDrawables[0] = new ShapeDrawable(new RectShape());
//
mDrawables[1] = new ShapeDrawable(new OvalShape());
//
mDrawables[2] = new ShapeDrawable(new RoundRectShape(outerR, null,
null));
// ,
mDrawables[3] = new ShapeDrawable(new RoundRectShape(outerR, inset,
null));
//// ,
mDrawables[4] = new ShapeDrawable(new RoundRectShape(outerR, inset,
innerR));
//
mDrawables[5] = new ShapeDrawable(new PathShape(path, 100, 100));
// ShapDrawble 45 -270
mDrawables[6] = new MyShapeDrawable(new ArcShape(45, -270));
mDrawables[0].getPaint().setColor(0xFFFF0000);
mDrawables[1].getPaint().setColor(0xFF00FF00);
mDrawables[2].getPaint().setColor(0xFF0000FF);
mDrawables[3].getPaint().setShader(makeSweep());
mDrawables[4].getPaint().setShader(makeLinear());
mDrawables[5].getPaint().setShader(makeTiling());
mDrawables[6].getPaint().setColor(0x88FF8844);
//DiscretePathEffect , 10, 4
PathEffect pe = new DiscretePathEffect(10, 4);
//CornerPathEffect 2
PathEffect pe2 = new CornerPathEffect(4);
mDrawables[3].getPaint().setPathEffect(
new ComposePathEffect(pe2, pe));
MyShapeDrawable msd = (MyShapeDrawable)mDrawables[6];
// 4
msd.getStrokePaint().setStrokeWidth(4);
}
@Override protected void onDraw(Canvas canvas) {
int x = 10;
int y = 10;
int width = 300;
int height = 50;
//
for (Drawable dr : mDrawables) {
dr.setBounds(x, y, x + width, y + height);
dr.draw(canvas);
y += height + 5;
}
}
}
}