Android Open Source - Sketcher Sat Val Picker

From Project

Back to project page Sketcher.

License

The source code is released under:

Apache License

If you think the Android project Sketcher listed in this page is inappropriate, such as containing malicious code/tools or violating the copyright, please email info at java2s dot com, thanks.

Java Source Code

package org.sketcher.colorpicker;
//from  w  ww  .  java 2  s. c  o m
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.Paint.Style;
import android.graphics.PorterDuff;
import android.graphics.Shader;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

public class SatValPicker extends View implements Picker {
  private Picker.OnColorChangedListener mListener = null;
  private final Paint mColor = new Paint();
  private final Paint mGradient = new Paint(Paint.ANTI_ALIAS_FLAG);
  private final Paint mTrackerPaint = new Paint(Paint.ANTI_ALIAS_FLAG);
  private float mHue = 0;

  public SatValPicker(Context context, AttributeSet attrs) {
    super(context, attrs);

    mGradient.setStyle(Paint.Style.STROKE);
    mGradient.setStrokeWidth(0);

    mTrackerPaint.setStyle(Style.STROKE);
    mTrackerPaint.setStrokeWidth(1);
    mTrackerPaint.setColor(Color.WHITE);
  }

  @Override
  protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    super.onSizeChanged(w, h, oldw, oldh);

    applyChages(w, h);
  }

  private void applyChages(int w, int h) {
    Shader valGradient = new LinearGradient(0, 0, 0, h, Color.WHITE,
        Color.BLACK, Shader.TileMode.CLAMP);

    int rgb = Color.HSVToColor(new float[] { mHue, 1f, 1f });
    Shader satGradient = new LinearGradient(0, 0, w, 0, Color.WHITE, rgb,
        Shader.TileMode.CLAMP);

    ComposeShader shader = new ComposeShader(valGradient, satGradient,
        PorterDuff.Mode.MULTIPLY);

    mGradient.setShader(shader);
    invalidate();
  }

  @Override
  public void setColor(int color) {
    mColor.setColor(color);

    float[] hsv = Utils.color2HSV(color);

    mHue = hsv[0];

    applyChages(getWidth(), getHeight());
  }

  @Override
  public void setOnColorChangedListener(Picker.OnColorChangedListener listener) {
    mListener = listener;
  }

  @Override
  protected void onDraw(Canvas canvas) {
    canvas.drawPaint(mGradient);

    float[] hsv = Utils.color2HSV(mColor.getColor());

    float x = hsv[1] * getWidth();
    float y = (1 - hsv[2]) * getHeight();
    canvas.drawCircle(x, y, 4, mTrackerPaint);
  }

  @Override
  public boolean onTouchEvent(MotionEvent event) {
    switch (event.getAction()) {
    case MotionEvent.ACTION_DOWN:
    case MotionEvent.ACTION_MOVE:
      float sat = event.getX() / getWidth();
      float val = 1 - event.getY() / getHeight();

      mColor.setColor(Color.HSVToColor(0xFF,
          new float[] { mHue, sat, val }));

      mListener.colorChanged(mColor);
      invalidate();
      return true;
    }

    return false;
  }
}

Java Source Code List