pplugins/pui/slider.cpp

/*
  Copyright 2013 Peter Nelson

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <pugl/pugl.h>
#include "pui.h"

static const int trough_cut = 20;
static const int pad = 20;

static const float slider_coords[][4] = {
	{      0,      0,   .25f,    .5f }, /// Small vertical slider
	{    .5f,   .25f,   .75f,   .75f }, /// Large vertical slider
	{   .75f,      0,      1, .1875f }, /// Vertical trough top
	{   .75f, .1875f,      1, .5625f }, /// Vertical trough
	{   .75f, .5625f,      1,   .75f }, /// Vertical trough bottom

	{   .25f,      0,   .75f,   .25f }, /// Small horizontal slider
	{      0,    .5f,    .5f,   .75f }, /// Large horizontal slider
	{      0,   .75f, .1875f,      1 }, /// Horizontal trough left
	{ .1875f,   .75f, .5625f,      1 }, /// Horizontal trough
	{ .5625f,   .75f,   .75f,      1 }, /// Horizontal trough right
};

enum SliderPart {
	SP_VSMALL,
	SP_VLARGE,
	SP_VTOP,
	SP_VTROUGH,
	SP_VBOTTOM,

	SP_HSMALL,
	SP_HLARGE,
	SP_HLEFT,
	SP_HTROUGH,
	SP_HRIGHT,
};

HSlider::HSlider(bool big, int h)
{
	this->h = h;
	this->big = big;
}

VSlider::VSlider(bool big, int w)
{
	this->w = w;
	this->big = big;
}

float HSlider::GetNewValue(int x, int y)
{
	int x2 = this->x + pad;
	int w2 = this->w - pad - pad;
	if (x <= x2) return min;
	if (x >= x2 + w2) return max;
	return (x - x2) * (max - min) / w2 + min;
}

static void slider_rect(SliderPart part, int x1, int y1, int x2, int y2)
{
	const float *p = slider_coords[part];
	glTexCoord2f(p[0], p[1]);
	glVertex2f(x1, y1);
	glTexCoord2f(p[0], p[3]);
	glVertex2f(x1, y2);
	glTexCoord2f(p[2], p[3]);
	glVertex2f(x2, y2);
	glTexCoord2f(p[2], p[1]);
	glVertex2f(x2, y1);
}

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

	glEnable(GL_TEXTURE_2D);

	GLuint t = TEX_SLIDERS;
	int trough_h = pui->h[t] * .25f;
	int my = (h - trough_h) * 0.5f + y;

	glBindTexture(GL_TEXTURE_2D, pui->tex[t]);
	glBegin(GL_QUADS);
	glColor3f(1.0, 1.0, 1.0);
	slider_rect(SP_HLEFT,   x,                  my, x + trough_cut,     my + trough_h);
	slider_rect(SP_HTROUGH, x + trough_cut,     my, x + w - trough_cut, my + trough_h);
	slider_rect(SP_HRIGHT,  x + w - trough_cut, my, x + w,              my + trough_h);
	glEnd();

	float slider_w = pui->w[t] * .5f;
	float slider_h = pui->h[t] * .25f;
	int x3 = this->x + pad;
	int w3 = this->w - pad - pad;
	my = (h - slider_h) * 0.5f + y;
	int mx = x3 + w3 * m - slider_w * 0.5f;

	glBindTexture(GL_TEXTURE_2D, pui->tex[t]);
	glBegin(GL_QUADS);
	if (this->colour.a) glColor4f(colour.r, colour.g, colour.b, colour.a);
	slider_rect(big ? SP_HLARGE : SP_HSMALL, mx, my, mx + slider_w, my + slider_h);
	glEnd();

	glDisable(GL_TEXTURE_2D);
}


float VSlider::GetNewValue(int x, int y)
{
	int y2 = this->y + pad;
	int h2 = this->h - pad - pad;
	if (y <= y2) return max;
	if (y >= y2 + h2) return min;
	return (y2 + h2 - y) * (max - min) / h2 + min;
}

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

	glEnable(GL_TEXTURE_2D);

	GLuint t = TEX_SLIDERS;
	int trough_w = pui->w[t] * .25f;
	int mx = (w - trough_w) * 0.5f + x;

	glBindTexture(GL_TEXTURE_2D, pui->tex[t]);
	glBegin(GL_QUADS);
	glColor3f(1.0, 1.0, 1.0);
	slider_rect(SP_VTOP,    mx, y,                  mx + trough_w, y + trough_cut);
	slider_rect(SP_VTROUGH, mx, y + trough_cut,     mx + trough_w, y + h - trough_cut);
	slider_rect(SP_VBOTTOM, mx, y + h - trough_cut, mx + trough_w, y + h);
	glEnd();

	float slider_w = pui->w[t] * .25f;
	float slider_h = pui->h[t] * .5f;
	int y3 = this->y + pad;
	int h3 = this->h - pad - pad;
	mx = (w - slider_w) * 0.5f + x;
	int my = y3 + h3 - h3 * m - slider_h * 0.5f;

	glBindTexture(GL_TEXTURE_2D, pui->tex[t]);
	glBegin(GL_QUADS);
	if (this->colour.a) glColor4f(colour.r, colour.g, colour.b, colour.a);
	slider_rect(big ? SP_VLARGE : SP_VSMALL, mx, my, mx + slider_w, my + slider_h);
	glEnd();

	glDisable(GL_TEXTURE_2D);

	char tmp[128];
	snprintf(tmp, sizeof tmp, "%s", this->label);

	FTBBox box = pui->font->BBox(tmp);
	FTPoint p = box.Upper() - box.Lower();
	float cx = p.X();
	float cy = p.Y();

	float ox = -.5f;
	float oy = 0;

	glPushMatrix();
//	glColor4f(colour.r, colour.g, colour.b, colour.a);
	glTranslatef(x + w * 0.5f, y - 4, 0);
	glScalef(.5f, -.5f, 1);
	glTranslatef(cx * ox, -cy * oy, 0);
	glColor4f(0, 0, 0, 1);
	pui->font->Render(tmp);
	glTranslatef(0, 2, 0);
	glColor4f(1, 1, 1, 1);
	pui->font->Render(tmp);
	glPopMatrix();

	Widget::OnPaint(pui);
}