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ofImageのマスク機能を使って、文字でマスキング。
ofImage.getTextureReference().SetAlphaMask(ofFbo.getTexture())でofFboの描写内容を使う。
Masking with text using ofImage’s mask function.
Use ofImage.getTextureReference().SetAlphaMask(ofFbo.getTexture()) to use ofFbo’s description.
[ Source ]
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#pragma once #include "ofMain.h" class ofApp : public ofBaseApp { public: void setup(); void update(); void draw(); void keyPressed(int key) {}; void keyReleased(int key) {}; void mouseMoved(int x, int y) {}; void mouseDragged(int x, int y, int button) {}; void mousePressed(int x, int y, int button) {}; void mouseReleased(int x, int y, int button) {}; void windowResized(int w, int h) {}; void dragEvent(ofDragInfo dragInfo) {}; void gotMessage(ofMessage msg) {}; void draw_arrow(glm::vec2 location, glm::vec2 target, float size, ofColor fill_color, ofColor no_fill_color); ofImage image; ofFbo fbo; float font_size; ofTrueTypeFont font; }; |
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#include "ofApp.h" //-------------------------------------------------------------- void ofApp::setup() { ofSetFrameRate(30); ofSetWindowTitle("openframeworks"); ofBackground(239); ofSetLineWidth(2); ofSetRectMode(ofRectMode::OF_RECTMODE_CENTER); this->image.loadImage("images/lenna.png"); this->image.resize(720, 720); this->fbo.allocate(720, 720); this->font_size = 28; this->font.loadFont("fonts/Kazesawa-Bold.ttf", this->font_size, true, true, true); } //-------------------------------------------------------------- void ofApp::update() { ofSeedRandom(39); string word = "ABCDEFGHEJKLMNOPQRSTUVWXYZ"; int sample_count = 100; this->fbo.begin(); ofClear(0); ofEnableBlendMode(ofBlendMode::OF_BLENDMODE_ADD); ofTranslate(this->fbo.getWidth() * 0.5, this->fbo.getHeight() * 0.5); for (int x = -300; x <= 300; x += this->font_size) { for (int y = -300; y <= 300; y += this->font_size) { int word_index = (int)ofMap(ofNoise(x * 0.002, y * 0.002, ofGetFrameNum() * 0.005), 0, 1, 0, word.size() * 2) % word.size(); ofPath chara_path = this->font.getCharacterAsPoints(word[word_index], true, false); vector<ofPolyline> outline = chara_path.getOutline(); ofFill(); ofSetColor(255); ofBeginShape(); for (int outline_index = 0; outline_index < outline.size(); outline_index++) { if (outline_index != 0) { ofNextContour(true); } auto vertices = outline[outline_index].getResampledByCount(sample_count).getVertices(); for (auto& vertex : vertices) { auto location = vertex - glm::vec3(this->font_size * 0.5, this->font_size * -0.5, 0); location += glm::vec3(x, y, 0); ofVertex(location); } } ofEndShape(); ofNoFill(); ofSetColor(0); ofBeginShape(); for (int outline_index = 0; outline_index < outline.size(); outline_index++) { if (outline_index != 0) { ofNextContour(true); } auto vertices = outline[outline_index].getResampledByCount(sample_count).getVertices(); for (auto& vertex : vertices) { auto location = vertex - glm::vec3(this->font_size * 0.5, this->font_size * -0.5, 0); location += glm::vec3(x, y, 0); ofVertex(location); } } ofEndShape(); } } this->fbo.end(); this->image.getTextureReference().setAlphaMask(this->fbo.getTexture()); this->image.update(); } //-------------------------------------------------------------- void ofApp::draw() { ofSetColor(255); this->image.draw(ofGetWindowSize() * 0.5); } //-------------------------------------------------------------- void ofApp::draw_arrow(glm::vec2 location, glm::vec2 target, float size, ofColor fill_color, ofColor no_fill_color) { auto angle = std::atan2(target.y - location.y, target.x - location.x); ofSetColor(fill_color); ofFill(); ofBeginShape(); ofVertex(location + glm::vec2(size * cos(angle), size * sin(angle))); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5))); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5))); ofEndShape(); ofBeginShape(); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25); ofEndShape(); ofSetColor(no_fill_color); ofNoFill(); ofBeginShape(); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5))); ofVertex(location + glm::vec2(size * cos(angle), size * sin(angle))); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5))); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25); ofEndShape(); ofBeginShape(); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25); ofVertex(location + glm::vec2(size * 0.5 * cos(angle - PI * 0.5), size * 0.5 * sin(angle - PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25 - glm::vec2(size * cos(angle), size * sin(angle)) * 0.5); ofVertex(location + glm::vec2(size * 0.5 * cos(angle + PI * 0.5), size * 0.5 * sin(angle + PI * 0.5)) * 0.25); ofEndShape(); } //-------------------------------------------------------------- int main() { ofSetupOpenGL(720, 720, OF_WINDOW); ofRunApp(new ofApp()); } |