libgui/source/gui/GuiElement.cpp

/****************************************************************************
 * Copyright (C) 2015 Dimok
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 ****************************************************************************/
#include <gui/GuiElement.h>

//! TODO remove this!
static int32_t screenwidth = 1280;
static int32_t screenheight = 720;

/**
 * Constructor for the Object class.
 */
GuiElement::GuiElement() {
    xoffset = 0.0f;
    yoffset = 0.0f;
    zoffset = 0.0f;
    width = 0.0f;
    height = 0.0f;
    alpha = 1.0f;
    scaleX = 1.0f;
    scaleY = 1.0f;
    scaleZ = 1.0f;
    for (int32_t i = 0; i < 5; i++)
        state[i] = STATE_DEFAULT;
    stateChan = -1;
    parentElement = NULL;
    rumble = true;
    selectable = false;
    clickable = false;
    holdable = false;
    drawOverOnlyWhenSelected = false;
    visible = true;
    yoffsetDyn = 0;
    xoffsetDyn = 0;
    alphaDyn = -1;
    scaleDyn = 1;
    effects = EFFECT_NONE;
    effectAmount = 0;
    effectTarget = 0;
    effectsOver = EFFECT_NONE;
    effectAmountOver = 0;
    effectTargetOver = 0;
    angle = 0.0f;

    // default alignment - align to top left
    alignment = (ALIGN_CENTER | ALIGN_MIDDLE);
}

/**
 * Get the left position of the GuiElement.
 * @see SetLeft()
 * @return Left position in pixel.
 */
float GuiElement::getLeft() {
    float pWidth = 0;
    float pLeft = 0;
    float pScaleX = 1.0f;

    if (parentElement) {
        pWidth = parentElement->getWidth();
        pLeft = parentElement->getLeft();
        pScaleX = parentElement->getScaleX();
    }

    pLeft += xoffsetDyn;

    float x = pLeft;

    //! TODO: the conversion from int to float and back to int is bad for performance, change that
    if (alignment & ALIGN_CENTER) {
        x = pLeft + pWidth * 0.5f * pScaleX - width * 0.5f * getScaleX();
    } else if (alignment & ALIGN_RIGHT) {
        x = pLeft + pWidth * pScaleX - width * getScaleX();
    }

    return x + xoffset;
}

/**
 * Get the top position of the GuiElement.
 * @see SetTop()
 * @return Top position in pixel.
 */
float GuiElement::getTop() {
    float pHeight = 0;
    float pTop = 0;
    float pScaleY = 1.0f;

    if (parentElement) {
        pHeight = parentElement->getHeight();
        pTop = parentElement->getTop();
        pScaleY = parentElement->getScaleY();
    }

    pTop += yoffsetDyn;

    float y = pTop;

    //! TODO: the conversion from int to float and back to int is bad for performance, change that
    if (alignment & ALIGN_MIDDLE) {
        y = pTop + pHeight * 0.5f * pScaleY - getHeight() * 0.5f * getScaleY();
    } else if (alignment & ALIGN_BOTTOM) {
        y = pTop + pHeight * pScaleY - getHeight() * getScaleY();
    }

    return y + yoffset;
}

void GuiElement::setEffect(int32_t eff, int32_t amount, int32_t target) {
    if (eff & EFFECT_SLIDE_IN) {
        // these calculations overcompensate a little
        if (eff & EFFECT_SLIDE_TOP) {
            if (eff & EFFECT_SLIDE_FROM)
                yoffsetDyn = (int32_t) -getHeight() * scaleY;
            else
                yoffsetDyn = -screenheight;
        } else if (eff & EFFECT_SLIDE_LEFT) {
            if (eff & EFFECT_SLIDE_FROM)
                xoffsetDyn = (int32_t) -getWidth() * scaleX;
            else
                xoffsetDyn = -screenwidth;
        } else if (eff & EFFECT_SLIDE_BOTTOM) {
            if (eff & EFFECT_SLIDE_FROM)
                yoffsetDyn = (int32_t) getHeight() * scaleY;
            else
                yoffsetDyn = screenheight;
        } else if (eff & EFFECT_SLIDE_RIGHT) {
            if (eff & EFFECT_SLIDE_FROM)
                xoffsetDyn = (int32_t) getWidth() * scaleX;
            else
                xoffsetDyn = screenwidth;
        }
    }
    if ((eff & EFFECT_FADE) && amount > 0) {
        alphaDyn = 0;
    } else if ((eff & EFFECT_FADE) && amount < 0) {
        alphaDyn = alpha;
    }
    effects |= eff;
    effectAmount = amount;
    effectTarget = target;
}

//!Sets an effect to be enabled on wiimote cursor over
//!\param e Effect to enable
//!\param a Amount of the effect (usage varies on effect)
//!\param t Target amount of the effect (usage varies on effect)
void GuiElement::setEffectOnOver(int32_t e, int32_t a, int32_t t) {
    effectsOver |= e;
    effectAmountOver = a;
    effectTargetOver = t;
}

void GuiElement::resetEffects() {
    yoffsetDyn = 0;
    xoffsetDyn = 0;
    alphaDyn = -1;
    scaleDyn = 1;
    effects = EFFECT_NONE;
    effectAmount = 0;
    effectTarget = 0;
    effectsOver = EFFECT_NONE;
    effectAmountOver = 0;
    effectTargetOver = 0;
}

void GuiElement::updateEffects() {
    if (!this->isVisible() && parentElement)
        return;

    if (effects & (EFFECT_SLIDE_IN | EFFECT_SLIDE_OUT | EFFECT_SLIDE_FROM)) {
        if (effects & EFFECT_SLIDE_IN) {
            if (effects & EFFECT_SLIDE_LEFT) {
                xoffsetDyn += effectAmount;

                if (xoffsetDyn >= 0) {
                    xoffsetDyn = 0;
                    effects = 0;
                    effectFinished(this);
                }
            } else if (effects & EFFECT_SLIDE_RIGHT) {
                xoffsetDyn -= effectAmount;

                if (xoffsetDyn <= 0) {
                    xoffsetDyn = 0;
                    effects = 0;
                    effectFinished(this);
                }
            } else if (effects & EFFECT_SLIDE_TOP) {
                yoffsetDyn += effectAmount;

                if (yoffsetDyn >= 0) {
                    yoffsetDyn = 0;
                    effects = 0;
                    effectFinished(this);
                }
            } else if (effects & EFFECT_SLIDE_BOTTOM) {
                yoffsetDyn -= effectAmount;

                if (yoffsetDyn <= 0) {
                    yoffsetDyn = 0;
                    effects = 0;
                    effectFinished(this);
                }
            }
        } else {
            if (effects & EFFECT_SLIDE_LEFT) {
                xoffsetDyn -= effectAmount;

                if (xoffsetDyn <= -screenwidth) {
                    effects = 0; // shut off effect
                    effectFinished(this);
                } else if ((effects & EFFECT_SLIDE_FROM) && xoffsetDyn <= -getWidth()) {
                    effects = 0; // shut off effect
                    effectFinished(this);
                }
            } else if (effects & EFFECT_SLIDE_RIGHT) {
                xoffsetDyn += effectAmount;

                if (xoffsetDyn >= screenwidth) {
                    effects = 0; // shut off effect
                    effectFinished(this);
                } else if ((effects & EFFECT_SLIDE_FROM) && xoffsetDyn >= getWidth() * scaleX) {
                    effects = 0; // shut off effect
                    effectFinished(this);
                }
            } else if (effects & EFFECT_SLIDE_TOP) {
                yoffsetDyn -= effectAmount;

                if (yoffsetDyn <= -screenheight) {
                    effects = 0; // shut off effect
                    effectFinished(this);
                } else if ((effects & EFFECT_SLIDE_FROM) && yoffsetDyn <= -getHeight()) {
                    effects = 0; // shut off effect
                    effectFinished(this);
                }
            } else if (effects & EFFECT_SLIDE_BOTTOM) {
                yoffsetDyn += effectAmount;

                if (yoffsetDyn >= screenheight) {
                    effects = 0; // shut off effect
                    effectFinished(this);
                } else if ((effects & EFFECT_SLIDE_FROM) && yoffsetDyn >= getHeight()) {
                    effects = 0; // shut off effect
                    effectFinished(this);
                }
            }
        }
    } else if (effects & EFFECT_FADE) {
        alphaDyn += effectAmount * (1.0f / 255.0f);

        if (effectAmount < 0 && alphaDyn <= 0) {
            alphaDyn = 0;
            effects = 0; // shut off effect
            effectFinished(this);
        } else if (effectAmount > 0 && alphaDyn >= alpha) {
            alphaDyn = alpha;
            effects = 0; // shut off effect
            effectFinished(this);
        }
    } else if (effects & EFFECT_SCALE) {
        scaleDyn += effectAmount * 0.01f;

        if ((effectAmount < 0 && scaleDyn <= (effectTarget * 0.01f))
            || (effectAmount > 0 && scaleDyn >= (effectTarget * 0.01f))) {
            scaleDyn = effectTarget * 0.01f;
            effects = 0; // shut off effect
            effectFinished(this);
        }
    }
}