Android Open Source - Sketcher-Tab Sat Val Picker

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Back to project page Sketcher-Tab.

License

The source code is released under:

Apache License

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Java Source Code

package org.sketchertab.colorpicker;
/*from   w  ww  .ja v  a2s. c om*/
import android.content.Context;
import android.graphics.*;
import android.graphics.Paint.Style;
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);
    float denst = getResources().getDisplayMetrics().density;
    mTrackerPaint.setStrokeWidth(denst);
    mTrackerPaint.setColor(Color.WHITE);
    setLayerType(View.LAYER_TYPE_SOFTWARE, null);
  }

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

  private void applyChanges(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, 1, 1});
    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();
  }

    public void setColor(int color) {
        float[] hsv = Utils.color2HSV(color);
    mHue = hsv[0];

        mColor.setColor(color);
        applyChanges(getWidth(), getHeight());

    }

  public void setHue(int color) {
    float[] hsv = Utils.color2HSV(color);
    mHue = hsv[0];

        int curColor = mColor.getColor();
        float[] curHsv = Utils.color2HSV(curColor);
        curHsv[0] = mHue;

        mColor.setColor(Color.HSVToColor(curHsv));

    applyChanges(getWidth(), getHeight());
  }

    public int getColor() {
        return mColor.getColor();
    }

  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();
    float denst = getResources().getDisplayMetrics().density;
    float pickerRadius = 4 * denst;
    canvas.drawCircle(x, y, pickerRadius, 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.getColor());
      invalidate();
      return true;
    }

    return false;
  }
}

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