FairEmail/colorpicker/src/main/java/com/flask/colorpicker/renderer/SimpleColorWheelRenderer.java

package com.flask.colorpicker.renderer;

import android.graphics.Color;
import android.graphics.Paint;

import com.flask.colorpicker.ColorCircle;
import com.flask.colorpicker.builder.PaintBuilder;

public class SimpleColorWheelRenderer extends AbsColorWheelRenderer {
	private Paint selectorFill = PaintBuilder.newPaint().build();
	private float[] hsv = new float[3];

	@Override
	public void draw() {
		final int setSize = colorCircleList.size();
		int currentCount = 0;
		float half = colorWheelRenderOption.targetCanvas.getWidth() / 2f;
		int density = colorWheelRenderOption.density;
		float maxRadius = colorWheelRenderOption.maxRadius;

		for (int i = 0; i < density; i++) {
			float p = (float) i / (density - 1); // 0~1
			float radius = maxRadius * p;
			float size = colorWheelRenderOption.cSize;
			int total = calcTotalCount(radius, size);

			for (int j = 0; j < total; j++) {
				double angle = Math.PI * 2 * j / total + (Math.PI / total) * ((i + 1) % 2);
				float x = half + (float) (radius * Math.cos(angle));
				float y = half + (float) (radius * Math.sin(angle));
				hsv[0] = (float) (angle * 180 / Math.PI);
				hsv[1] = radius / maxRadius;
				hsv[2] = colorWheelRenderOption.lightness;
				selectorFill.setColor(Color.HSVToColor(hsv));
				selectorFill.setAlpha(getAlphaValueAsInt());

				colorWheelRenderOption.targetCanvas.drawCircle(x, y, size - colorWheelRenderOption.strokeWidth, selectorFill);

				if (currentCount >= setSize)
					colorCircleList.add(new ColorCircle(x, y, hsv));
				else colorCircleList.get(currentCount).set(x, y, hsv);
				currentCount++;
			}
		}
	}
}