#include <pugl/pugl.h>
#include "pui.h"

float Knob::GetNewValue(int x, int y)
{
	int p = 20;
	if (false) {
		int x2 = this->x + p;
		int w2 = this->w - p - p;
		if (x <= x2) return min;
		if (x >= x2 + w2) return max;
		return (x - x2) * (max - min) / w2 + min;
	} else {
		int y2 = this->y + p;
		int h2 = this->h - p - p;
		if (y <= y2) return max;
		if (y >= y2 + h2) return min;
		return (y2 + h2 - y) * (max - min) / h2 + min;
	}
}

void Knob::OnPaint(const PUi *pui) const
{
//	float m = (value - min) / (max - min);

//	printf("%d\n", tex[TEX_TROUGH1]);

	glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
	glEnable(GL_BLEND);
	glEnable(GL_TEXTURE_2D);

	int t = TEX_KNOB;
	int w2 = pui->w[t];
	int h2 = pui->h[t];
	int mx, my;
	mx = (w - w2) * 0.5f + x;
	my = (h - h2) * 0.5f + y;

	glBindTexture(GL_TEXTURE_2D, pui->tex[t]);
	glBegin(GL_QUADS);
	glColor3f(1.0, 1.0, 1.0);
	glTexCoord2f(0.0, 0.0);
	glVertex2f(     mx,      my);
	glTexCoord2f(0.0, 1.0);
	glVertex2f(     mx, h2 + my);
	glTexCoord2f(1.0, 1.0);
	glVertex2f(w2 + mx, h2 + my);
	glTexCoord2f(1.0, 0.0);
	glVertex2f(w2 + mx,      my);
	glEnd();
	glDisable(GL_TEXTURE_2D);
}