From 459d1daf71dd8991c60dc8c84d1154802eec331b Mon Sep 17 00:00:00 2001
From: Tim Redfern <tim@getdrop.com>
Date: Tue, 22 May 2018 00:00:06 +0100
Subject: OE started

---
 ofxHelios/src/lineTransformer.cpp | 127 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 127 insertions(+)
 create mode 100644 ofxHelios/src/lineTransformer.cpp

(limited to 'ofxHelios/src/lineTransformer.cpp')

diff --git a/ofxHelios/src/lineTransformer.cpp b/ofxHelios/src/lineTransformer.cpp
new file mode 100644
index 0000000..c405569
--- /dev/null
+++ b/ofxHelios/src/lineTransformer.cpp
@@ -0,0 +1,127 @@
+#include "lineTransformer.h"
+
+
+void lineTransformer::drawWarpFrame(glm::vec2 warpframe[4]){
+    ofSetColor(255,255,255);
+    ofNoFill();
+    for (int i=0;i<4;i++){
+    	ofDrawCircle(warpframe[i],25);
+    	ofDrawLine(warpframe[i],warpframe[(i+1)%4]);
+    }
+}
+
+void lineTransformer::gaussianElimination(float * input, int n)
+{
+	auto i = 0;
+	auto j = 0;
+	auto m = n - 1;
+
+	while (i < m && j < n) 
+	{
+		auto iMax = i;
+		for (auto k = i + 1; k < m; ++k)
+		{
+			if (fabs(input[k * n + j]) > fabs(input[iMax * n + j])) 
+			{
+				iMax = k;
+			}
+		}
+
+		if (input[iMax * n + j] != 0) 
+		{
+			if (i != iMax)
+			{
+				for (auto k = 0; k < n; ++k)
+				{
+					auto ikIn = input[i * n + k];
+					input[i * n + k] = input[iMax * n + k];
+					input[iMax * n + k] = ikIn;
+				}
+			}
+
+			float ijIn = input[i * n + j];
+			for (auto k = 0; k < n; ++k)
+			{
+				input[i * n + k] /= ijIn;
+			}
+
+			for (auto u = i + 1; u < m; ++u)
+			{
+				auto ujIn = input[u * n + j];
+				for (auto k = 0; k < n; ++k)
+				{
+					input[u * n + k] -= ujIn * input[i * n + k];
+				}
+			}
+
+			++i;
+		}
+		++j;
+	}
+
+	for (auto i = m - 2; i >= 0; --i)
+	{
+		for (auto j = i + 1; j < n - 1; ++j)
+		{
+			input[i * n + m] -= input[i * n + j] * input[j * n + m];
+		}
+	}
+}
+
+glm::mat4 lineTransformer::getPerspectiveTransformMatrix(const glm::vec2 src[4], const glm::vec2 dst[4])
+{
+	float p[8][9] = 
+	{
+		{ -src[0][0], -src[0][1], -1, 0, 0, 0, src[0][0] * dst[0][0], src[0][1] * dst[0][0], -dst[0][0] }, // h11
+		{ 0, 0, 0, -src[0][0], -src[0][1], -1, src[0][0] * dst[0][1], src[0][1] * dst[0][1], -dst[0][1] }, // h12
+		{ -src[1][0], -src[1][1], -1, 0, 0, 0, src[1][0] * dst[1][0], src[1][1] * dst[1][0], -dst[1][0] }, // h13
+		{ 0, 0, 0, -src[1][0], -src[1][1], -1, src[1][0] * dst[1][1], src[1][1] * dst[1][1], -dst[1][1] }, // h21
+		{ -src[2][0], -src[2][1], -1, 0, 0, 0, src[2][0] * dst[2][0], src[2][1] * dst[2][0], -dst[2][0] }, // h22
+		{ 0, 0, 0, -src[2][0], -src[2][1], -1, src[2][0] * dst[2][1], src[2][1] * dst[2][1], -dst[2][1] }, // h23
+		{ -src[3][0], -src[3][1], -1, 0, 0, 0, src[3][0] * dst[3][0], src[3][1] * dst[3][0], -dst[3][0] }, // h31
+		{ 0, 0, 0, -src[3][0], -src[3][1], -1, src[3][0] * dst[3][1], src[3][1] * dst[3][1], -dst[3][1] }, // h32
+	};
+
+	gaussianElimination(&p[0][0], 9);
+
+	return glm::mat4(p[0][8], p[3][8], 0, p[6][8], 
+					 p[1][8], p[4][8], 0, p[7][8], 
+					 0, 0, 1, 0, 
+					 p[2][8], p[5][8], 0, 1);
+}
+
+ofPolyline lineTransformer::polyLineTransform(const ofMatrix4x4 xform, const ofPolyline& poly){
+	ofPolyline tempPoly;
+	for (auto& p:poly){
+		tempPoly.addVertex(ofVec3f(p)*xform);
+	}
+	return tempPoly;
+}
+
+colourPolyline lineTransformer::polyLineTransform(const ofMatrix4x4 xform,colourPolyline& poly,float colourFade){
+	colourPolyline tempPoly;
+	for (int i=0;i<poly.size();i++){
+		tempPoly.addVertex(ofVec3f(poly[i])*xform,poly.getColourAt(i)*colourFade);
+	}
+	return tempPoly;
+}
+		
+
+ofPolyline lineTransformer::makePolygon(int num,float diam){
+	ofPolyline poly;
+	float step=PI*2/num;
+	for (int i=0;i<=num;i++){
+		poly.addVertex(cos(step*i)*diam,sin(step*i)*diam);
+	}
+	return poly;
+}
+
+void lineTransformer::drawPoly(ofPolyline poly,float x,float y){
+	glPushMatrix();
+	ofTranslate(x,y);
+	poly.draw();
+	for (int i=0;i<poly.size();i++){
+		ofDrawBitmapString(poly.getDegreesAtIndex(i),poly[i].x+10,poly[i].y+10,0);
+	}
+	glPopMatrix();
+}
-- 
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