149 lines
3.2 KiB
C++
149 lines
3.2 KiB
C++
#include <cmath>
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#include <pugl/pugl.h>
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#include "pui.h"
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float Knob::GetNewValue(int x, int y)
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{
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int dx = (this->x + this->w / 2) - x;
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int dy = (this->y + this->h / 2) - y;
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float a = .5f - (atan2(dx, dy) * .5f / M_PI) * 1.33f;
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if (a < 0) a = 0;
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if (a > 1) a = 1;
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return a * (max - min) + min;
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}
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static void DrawPartial(GLuint t1, GLuint t2, int seg, float x1, float y1, float x2, float y2, float r)
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{
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float xc = .5f;
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float yc = .5f;
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if (r >= 0 && r <= .25f) {
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float t;
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if (r <= .125f) {
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t = .5 - tanf((.125f - r) * 2 * M_PI) * .5f;
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} else {
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t = .5 + tanf((r - .125f) * 2 * M_PI) * .5f;
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}
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float x, y;
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switch (seg) {
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default:
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case 0: x = x1; y = 1 - t; break;
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case 1: x = t; y = y1; break;
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case 2: x = x1; y = t; break;
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case 3: x = 1 - t; y = y1; break;
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}
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glBindTexture(GL_TEXTURE_2D, t2);
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glBegin(GL_TRIANGLES);
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glTexCoord2f(xc, yc);
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glVertex2f(xc, yc);
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glTexCoord2f(x1, y1);
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glVertex2f(x1, y1);
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glTexCoord2f(x, y);
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glVertex2f(x, y);
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glEnd();
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glBindTexture(GL_TEXTURE_2D, t1);
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glBegin(GL_TRIANGLES);
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glTexCoord2f(xc, yc);
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glVertex2f(xc, yc);
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glTexCoord2f(x, y);
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glVertex2f(x, y);
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glTexCoord2f(x2, y2);
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glVertex2f(x2, y2);
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glEnd();
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} else {
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glBindTexture(GL_TEXTURE_2D, r > 0 ? t2 : t1);
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glBegin(GL_TRIANGLES);
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glTexCoord2f(xc, yc);
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glVertex2f(xc, yc);
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glTexCoord2f(x1, y1);
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glVertex2f(x1, y1);
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glTexCoord2f(x2, y2);
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glVertex2f(x2, y2);
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glEnd();
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}
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}
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void Knob::OnPaint(const PUi *pui) const
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{
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
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glEnable(GL_BLEND);
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glEnable(GL_TEXTURE_2D);
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float mx = (w - pui->w[TEX_KNOB]) * 0.5f + x;
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float my = (h - pui->h[TEX_KNOB]) * 0.5f + y;
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float hw = pui->w[TEX_KNOB] * .5f;
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float hh = pui->h[TEX_KNOB] * .5f;
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glPushMatrix();
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glTranslatef(mx, my, 0);
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glColor3f(1, 1, 1);
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glScalef(pui->w[TEX_KNOB], pui->h[TEX_KNOB], 1);
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GLuint t1 = pui->tex[TEX_KNOB];
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GLuint t2 = pui->tex[TEX_KNOB_PRE];
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float r = (this->value - this->min) / (this->max - this->min) - .5f;
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r /= 1.3333f;
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r += .5f;
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r -= .125f;
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DrawPartial(t1, t2, 0, 0, 1, 0, 0, r);
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r -= .25f;
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DrawPartial(t1, t2, 1, 0, 0, 1, 0, r);
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r -= .25f;
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DrawPartial(t1, t2, 2, 1, 0, 1, 1, r);
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r -= .25f;
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DrawPartial(t1, t2, 3, 1, 1, 0, 1, r);
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glPopMatrix();
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r = (this->value - this->min) / (this->max - this->min) - .5f;
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glPushMatrix();
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glTranslatef(mx + hw, my + hw, 0);
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glRotatef(r * 270, 0, 0, 1);
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glBindTexture(GL_TEXTURE_2D, pui->tex[TEX_KNOB_SEL]);
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glBegin(GL_QUADS);
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glColor3f(1.0, 1.0, 1.0);
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glTexCoord2f(0, 0);
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glVertex2f(-hw, -hh);
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glTexCoord2f(0, 1);
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glVertex2f(-hw, hh);
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glTexCoord2f(1, 1);
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glVertex2f( hw, hh);
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glTexCoord2f(1, 0);
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glVertex2f( hw, -hh);
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glEnd();
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glPopMatrix();
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glDisable(GL_TEXTURE_2D);
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char tmp[128];
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snprintf(tmp, sizeof tmp, "%s: %06d", this->label, (int)(this->value * 44100));
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FTBBox box = pui->font->BBox(tmp);
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FTPoint p = box.Upper() - box.Lower();
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float cx = p.X();
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float cy = p.Y();
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float ox = -.5f;
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float oy = 0;
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glPushMatrix();
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glTranslatef(x + w * 0.5f, y - 4, 0);
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glScalef(.5f, -.5f, 1);
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glTranslatef(cx * ox, -cy * oy, 0);
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glColor4f(0, 0, 0, 1);
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pui->font->Render(tmp);
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glTranslatef(0, 2, 0);
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glColor4f(1, 1, 1, 1);
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pui->font->Render(tmp);
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glPopMatrix();
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}
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