AmbilWarnaKotak.java

package yuku.ambilwarna;

import android.annotation.SuppressLint;
import android.content.Context;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.ComposeShader;
import android.graphics.LinearGradient;
import android.graphics.Paint;
import android.graphics.PorterDuff;
import android.graphics.Shader;
import android.graphics.Shader.TileMode;
import android.util.AttributeSet;
import android.view.View;

public class AmbilWarnaKotak extends View {
	Paint paint;
	Shader luar;
	final float[] color = { 1.f, 1.f, 1.f };

	public AmbilWarnaKotak(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public AmbilWarnaKotak(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	@SuppressLint("DrawAllocation") @Override protected void onDraw(Canvas canvas) {
		super.onDraw(canvas);
		if (paint == null) {
			paint = new Paint();
			luar = new LinearGradient(0.f, 0.f, 0.f, this.getMeasuredHeight(), 0xffffffff, 0xff000000, TileMode.CLAMP);
		}
		int rgb = Color.HSVToColor(color);
		Shader dalam = new LinearGradient(0.f, 0.f, this.getMeasuredWidth(), 0.f, 0xffffffff, rgb, TileMode.CLAMP);
		ComposeShader shader = new ComposeShader(luar, dalam, PorterDuff.Mode.MULTIPLY);
		paint.setShader(shader);
		canvas.drawRect(0.f, 0.f, this.getMeasuredWidth(), this.getMeasuredHeight(), paint);
	}

	void setHue(float hue) {
		color[0] = hue;
		invalidate();
	}
}