TransformWidget.hpp

Go to the documentation of this file.

#pragma once
#include <widget/Widget.hpp>
 
 
namespace rack {
namespace widget {
 
 
struct TransformWidget : Widget {
    float transform[6];
 
    TransformWidget() {
        identity();
    }
 
    void identity() {
        nvgTransformIdentity(transform);
    }
 
    void translate(math::Vec delta) {
        float t[6];
        nvgTransformTranslate(t, VEC_ARGS(delta));
        nvgTransformPremultiply(transform, t);
    }
 
    void rotate(float angle) {
        float t[6];
        nvgTransformRotate(t, angle);
        nvgTransformPremultiply(transform, t);
    }
 
    void rotate(float angle, math::Vec origin) {
        translate(origin);
        rotate(angle);
        translate(origin.neg());
    }
 
    void scale(math::Vec s) {
        float t[6];
        nvgTransformScale(t, s.x, s.y);
        nvgTransformPremultiply(transform, t);
    }
 
    void draw(const DrawArgs& args) override {
        // No need to save the state because that is done in the parent
        nvgTransform(args.vg, transform[0], transform[1], transform[2], transform[3], transform[4], transform[5]);
        Widget::draw(args);
    }
 
    void drawLayer(const DrawArgs& args, int layer) override {
        // No need to save the state because that is done in the parent
        nvgTransform(args.vg, transform[0], transform[1], transform[2], transform[3], transform[4], transform[5]);
        Widget::drawLayer(args, layer);
    }
};
 
 
} // namespace widget
} // namespace rack