Add selective rendering of active/inactive knob texture.

pui/knob.cpp

@@ -1,53 +1,148 @@
+#include <cmath>
 #include <pugl/pugl.h>
 #include "pui.h"
 
 float Knob::GetNewValue(int x, int y)
 {
-	int p = 20;
+	int dx = (this->x + this->w / 2) - x;
-	if (false) {
+	int dy = (this->y + this->h / 2) - y;
-		int x2 = this->x + p;
+
-		int w2 = this->w - p - p;
+	float a = .5f - (atan2(dx, dy) * .5f / M_PI) * 1.33f;
-		if (x <= x2) return min;
+	if (a < 0) a = 0;
-		if (x >= x2 + w2) return max;
+	if (a > 1) a = 1;
-		return (x - x2) * (max - min) / w2 + min;
+
+	return a * (max - min) + min;
+}
+
+static void DrawPartial(GLuint t1, GLuint t2, int seg, float x1, float y1, float x2, float y2, float r)
+{
+	float xc = .5f;
+	float yc = .5f;
+
+	if (r >= 0 && r <= .25f) {
+		float t;
+		if (r <= .125f) {
+			t = .5 - tanf((.125f - r) * 2 * M_PI) * .5f;
+		} else {
+			t = .5 + tanf((r - .125f) * 2 * M_PI) * .5f;
+		}
+		float x, y;
+		switch (seg) {
+			default:
+			case 0: x = x1; y = 1 - t; break;
+			case 1: x = t; y = y1; break;
+			case 2: x = x1; y = t; break;
+			case 3: x = 1 - t; y = y1; break;
+		}
+
+		glBindTexture(GL_TEXTURE_2D, t2);
+		glBegin(GL_TRIANGLES);
+		glTexCoord2f(xc, yc);
+		glVertex2f(xc, yc);
+		glTexCoord2f(x1, y1);
+		glVertex2f(x1, y1);
+		glTexCoord2f(x, y);
+		glVertex2f(x, y);
+		glEnd();
+
+		glBindTexture(GL_TEXTURE_2D, t1);
+		glBegin(GL_TRIANGLES);
+		glTexCoord2f(xc, yc);
+		glVertex2f(xc, yc);
+		glTexCoord2f(x, y);
+		glVertex2f(x, y);
+		glTexCoord2f(x2, y2);
+		glVertex2f(x2, y2);
+		glEnd();
 	} else {
-		int y2 = this->y + p;
+		glBindTexture(GL_TEXTURE_2D, r > 0 ? t2 : t1);
-		int h2 = this->h - p - p;
+		glBegin(GL_TRIANGLES);
-		if (y <= y2) return max;
+		glTexCoord2f(xc, yc);
-		if (y >= y2 + h2) return min;
+		glVertex2f(xc, yc);
-		return (y2 + h2 - y) * (max - min) / h2 + min;
+		glTexCoord2f(x1, y1);
+		glVertex2f(x1, y1);
+		glTexCoord2f(x2, y2);
+		glVertex2f(x2, y2);
+		glEnd();
 	}
 }
 
 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;
+	float mx = (w - pui->w[TEX_KNOB]) * 0.5f + x;
-	int w2 = pui->w[t];
+	float my = (h - pui->h[TEX_KNOB]) * 0.5f + y;
-	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]);
+	float hw = pui->w[TEX_KNOB] * .5f;
+	float hh = pui->h[TEX_KNOB] * .5f;
+
+	glPushMatrix();
+	glTranslatef(mx, my, 0);
+	glColor3f(1, 1, 1);
+
+	glScalef(pui->w[TEX_KNOB], pui->h[TEX_KNOB], 1);
+
+	GLuint t1 = pui->tex[TEX_KNOB];
+	GLuint t2 = pui->tex[TEX_KNOB_PRE];
+
+	float r = (this->value - this->min) / (this->max - this->min) - .5f;
+	r /= 1.3333f;
+	r += .5f;
+
+	r -= .125f;
+	DrawPartial(t1, t2, 0, 0, 1, 0, 0, r);
+	r -= .25f;
+	DrawPartial(t1, t2, 1, 0, 0, 1, 0, r);
+	r -= .25f;
+	DrawPartial(t1, t2, 2, 1, 0, 1, 1, r);
+	r -= .25f;
+	DrawPartial(t1, t2, 3, 1, 1, 0, 1, r);
+
+	glPopMatrix();
+	r = (this->value - this->min) / (this->max - this->min) - .5f;
+
+	glPushMatrix();
+	glTranslatef(mx + hw, my + hw, 0);
+	glRotatef(r * 270, 0, 0, 1);
+	glBindTexture(GL_TEXTURE_2D, pui->tex[TEX_KNOB_SEL]);
 	glBegin(GL_QUADS);
 	glColor3f(1.0, 1.0, 1.0);
-	glTexCoord2f(0.0, 0.0);
+	glTexCoord2f(0, 0);
-	glVertex2f(     mx,      my);
+	glVertex2f(-hw, -hh);
-	glTexCoord2f(0.0, 1.0);
+	glTexCoord2f(0, 1);
-	glVertex2f(     mx, h2 + my);
+	glVertex2f(-hw,  hh);
-	glTexCoord2f(1.0, 1.0);
+	glTexCoord2f(1, 1);
-	glVertex2f(w2 + mx, h2 + my);
+	glVertex2f( hw,  hh);
-	glTexCoord2f(1.0, 0.0);
+	glTexCoord2f(1, 0);
-	glVertex2f(w2 + mx,      my);
+	glVertex2f( hw, -hh);
 	glEnd();
+
+	glPopMatrix();
 	glDisable(GL_TEXTURE_2D);
+
+	char tmp[128];
+	snprintf(tmp, sizeof tmp, "%s: %06d", this->label, (int)(this->value * 44100));
+	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();
+	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();
+
 }