Eigene Dateien/uni/visualisierung/vislu/bsp1/VisLu/VSlider.cpp

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#include "VSlider.h"
#include <GL/glew.h>
#include <GL/glut.h>
#include "vmath.h"
#include <math.h>
#include <iostream>

using namespace std;

VSlider::VSlider(float initialvalue, int x1, int y1, int x2, int y2, float * alph)
{
        this->value = initialvalue;
        this->begin = Vector2<float>(x1,y1);
        this->end = Vector2<float>(x2,y2);
        this->offset = 10;
        this->alpha = alph;
        this->color = Vector3<float>(1.0,0.0,0.0);
}

VSlider::~VSlider(void){
}

void VSlider::render() {
        //draw line
        glLineWidth(2);
        glEnable(GL_LINE_SMOOTH);
        glBegin(GL_LINES);
                glColor4f(this->color.x,this->color.y,this->color.z,*this->alpha);
                glVertex2i(this->begin.x, this->begin.y);
                glVertex2i(this->end.x, this->end.y);
        glEnd();
        //draw slide element
        Vector2<float> pos = this->begin.lerp(this->value,this->end);
        glLineWidth(7);
        glBegin(GL_LINES);
                glColor4f(this->color.x,this->color.y,this->color.z,*this->alpha);
                glVertex2i(pos.x-this->offset,pos.y);
                glVertex2i(pos.x+this->offset,pos.y);
        glEnd();
        glLineWidth(1);
        glDisable(GL_LINE_SMOOTH);
        //draw text
        glColor4f(1.0,1.0,1.0,*this->alpha);
        char prozent[20];
        char * ch;
        _snprintf_s(prozent, 20, "%.2f", this->value);
        glRasterPos3f(pos.x-this->offset-27, pos.y+3, 0.0);
        for(ch = prozent; *ch; ch++) {
                glutBitmapCharacter(GLUT_BITMAP_HELVETICA_10, (int)*ch);
        }
}

bool VSlider::isInside(int xm,int ym) {
        Vector2<float> pos = this->begin.lerp(this->value,this->end);
        Vector2<float> mouse(xm,ym);
        return (pos-mouse).length() < this->offset;
}

float * VSlider::getValue() {
        return &this->value;
}

void VSlider::pressed(int xm,int ym) {
        this->fromPoint.x = xm;
        this->fromPoint.y = ym;
}

void VSlider::drag(int xm,int ym) {
        Vector2<float> toPoint(xm,ym);
        Vector2<float> diffPoint = toPoint - fromPoint;

        float maxlength = (this->begin-this->end).length();
        float newvalue = (diffPoint.length()/maxlength);

        float sum = diffPoint[0] + diffPoint[1];
        if(sum >= 0) {
                if(this->value-newvalue >= 0.0)
                        this->value -= newvalue;
        } else {
                if(this->value+newvalue <= 1.0)
                        this->value += newvalue;
        }

        fromPoint = toPoint;
}

void VSlider::setValue(float val) {
        if(val >= 0.0 && val <= 1.0)
                this->value = val;
}

void VSlider::released(int xm,int ym) {
        this->fromPoint.x = 0;
        this->fromPoint.y = 0;
}

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