Sensing Machines Draw Bounds

ofApp-aspectFill.cpp

#include "ofApp.h"

void ofApp::setup()
{
    grabber.setup(640, 480);
}

void ofApp::update()
{
    grabber.update();
}

void ofApp::draw()
{
    // Scale and keep aspect ratio.
    float grabberRatio = grabber.getWidth() / grabber.getHeight();
    float windowRatio = ofGetWidth() / (float)ofGetHeight();

    // Fill width.
    float drawWidth = ofGetWidth();
    float drawHeight = drawWidth / grabberRatio;
    // OR
    // Fill height.
    //float drawHeight = ofGetHeight();
    //float drawWidth = drawHeight * grabberRatio;
  
    // Center in window.
    float drawX = (ofGetWidth() - drawWidth) / 2.0f;
    float drawY = (ofGetHeight() - drawHeight) / 2.0f;

    grabber.draw(drawX, drawY, drawWidth, drawHeight);
}

void ofApp::keyPressed(int key)
{
    if (key == 'f')
    {
        ofToggleFullscreen();
    }
    else if (key == 'w')
    {
        ofSetFullscreen(false);
        ofSetWindowShape(grabber.getWidth(), grabber.getHeight());
    }
}

ofApp-mouseSample.cpp

#include "ofApp.h"

void ofApp::setup()
{
    grabber.setup(640, 480);
}

void ofApp::update()
{
    grabber.update();
}

void ofApp::draw()
{
    // Scale using ofRectangle
    ofRectangle drawBounds;
    drawBounds.set(0, 0, grabber.getWidth(), grabber.getHeight());
    // Scale to fill, covering the entire window.
    drawBounds.scaleTo(ofGetCurrentViewport(), OF_SCALEMODE_FILL);
    // Draw the grabber image.
    grabber.draw(drawBounds);

    // Get a reference to the image pixels.
    ofPixels& grabberPix = grabber.getPixels();
    // Get the color value under the mouse.
    // Remap from draw space to pixel space.
    int sampleX = ofMap(ofGetMouseX(), drawBounds.x, drawBounds.width, 0, grabber.getWidth(), true);
    int sampleY = ofMap(ofGetMouseY(), drawBounds.y, drawBounds.height, 0, grabber.getHeight(), true);
    ofColor color = grabberPix.getColor(sampleX, sampleY);

    // Draw a rectangle under the mouse using the pixel color.
    ofFill();
    ofSetColor(color);
    ofDrawRectangle(ofGetMouseX() - 25, ofGetMouseY() - 25, 50, 50);
    // Add an outline so we can see the rectangle better.
    ofNoFill();
    ofSetColor(0);
    ofDrawRectangle(ofGetMouseX() - 25, ofGetMouseY() - 25, 50, 50);
    ofSetColor(255);
}

void ofApp::keyPressed(int key)
{
    if (key == 'f')
    {
        ofToggleFullscreen();
    }
    else if (key == 'w')
    {
        ofSetFullscreen(false);
        ofSetWindowShape(grabber.getWidth(), grabber.getHeight());
    }
}

ofApp-scaleMatrix.cpp

#include "ofApp.h"

void ofApp::setup()
{
    grabber.setup(640, 480);
}

void ofApp::update()
{
    grabber.update();
}

void ofApp::draw()
{
    // Scale using transform matrices.
    // Fill width.
    float scaleRatio = ofGetWidth() / grabber.getWidth();
    float drawX = 0;
    float drawHeight = grabber.getHeight() * scaleRatio;
    float drawY = (ofGetHeight() - drawHeight) / 2.0f;
    // OR
    // Fill height.
    //float scaleRatio = ofGetHeight() / grabber.getHeight();
    //float drawY = 0;
    //float drawWidth = grabber.getWidth() * scaleRatio;
    //float drawX = (ofGetWidth() - drawWidth) / 2.0f;

    ofTranslate(drawX, drawY);
    ofScale(scaleRatio);

    grabber.draw(0, 0);
}

void ofApp::keyPressed(int key)
{
    if (key == 'f')
    {
        ofToggleFullscreen();
    }
    else if (key == 'w')
    {
        ofSetFullscreen(false);
        ofSetWindowShape(grabber.getWidth(), grabber.getHeight());
    }
}

ofApp-scaleRect.cpp

#include "ofApp.h"

void ofApp::setup()
{
    grabber.setup(640, 480);
}

void ofApp::update()
{
    grabber.update();
}

void ofApp::draw()
{
    // Scale using ofRectangle.
    ofRectangle drawBounds;
    drawBounds.set(0, 0, grabber.getWidth(), grabber.getHeight());
    // Scale to fit, keeping the entire image visible.
    drawBounds.scaleTo(ofGetCurrentViewport(), OF_SCALEMODE_FIT);
    // OR
    // Scale to fill, covering the entire window.
    //drawBounds.scaleTo(ofGetCurrentViewport(), OF_SCALEMODE_FILL);

    grabber.draw(drawBounds);
}

void ofApp::keyPressed(int key)
{
    if (key == 'f')
    {
        ofToggleFullscreen();
    }
    else if (key == 'w')
    {
        ofSetFullscreen(false);
        ofSetWindowShape(grabber.getWidth(), grabber.getHeight());
    }
}

ofApp-stretch.cpp

#include "ofApp.h"

void ofApp::setup()
{
    grabber.setup(640, 480);
}

void ofApp::update()
{
    grabber.update();
}

void ofApp::draw()
{
    // Scale and stretch.
    grabber.draw(0, 0, ofGetWidth(), ofGetHeight());
}

void ofApp::keyPressed(int key)
{
    if (key == 'f')
    {
        ofToggleFullscreen();
    }
    else if (key == 'w')
    {
        ofSetFullscreen(false);
        ofSetWindowShape(grabber.getWidth(), grabber.getHeight());
    }
}

ofApp.h

#pragma once

#include "ofMain.h"

class ofApp : public ofBaseApp 
{
public:
    void setup();
    void update();
    void draw();
    void keyPressed(int key);

    ofVideoGrabber grabber;
};