opsu-dance/src/itdelatrisu/opsu/MenuButton.java

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/*
* opsu! - an open-source osu! client
* Copyright (C) 2014, 2015 Jeffrey Han
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*
* opsu! 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.
*
* opsu! 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 opsu!. If not, see <http://www.gnu.org/licenses/>.
*/
package itdelatrisu.opsu;
import org.newdawn.slick.Animation;
import org.newdawn.slick.Color;
import org.newdawn.slick.Font;
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import org.newdawn.slick.Image;
/**
* A convenience class for menu buttons, consisting of an image or animation
* and coordinates. Multi-part images currently do not support effects.
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*/
public class MenuButton {
/** The image associated with the button. */
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private Image img;
/** The left and right parts of the button (optional). */
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private Image imgL, imgR;
/** The animation associated with the button. */
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private Animation anim;
/** The center coordinates. */
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private float x, y;
/** The x and y radius of the button (scaled). */
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private float xRadius, yRadius;
/** The text to draw on the button. */
private String text;
/** The font to draw the text with. */
private Font font;
/** The color to draw the text with. */
private Color color;
/** Effect types. */
private static final int
EFFECT_EXPAND = 1,
EFFECT_FADE = 2,
EFFECT_ROTATE = 4;
/** The hover actions for this button. */
private int hoverEffect = 0;
/** The current and max scale of the button. */
private float scale = 1f, hoverScale = 1.25f;
/** The current and base alpha level of the button. */
private float alpha = 1f, baseAlpha = 0.75f;
/** The scaled expansion direction for the button. */
private Expand dir = Expand.CENTER;
/** Scaled expansion directions. */
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public enum Expand { CENTER, UP, RIGHT, LEFT, DOWN, UP_RIGHT, UP_LEFT, DOWN_RIGHT, DOWN_LEFT; }
/** The current and max rotation angles of the button. */
private float angle = 0f, maxAngle = 30f;
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/**
* Creates a new button from an Image.
* @param img the image
* @param x the center x coordinate
* @param y the center y coordinate
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*/
public MenuButton(Image img, float x, float y) {
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this.img = img;
this.x = x;
this.y = y;
this.xRadius = img.getWidth() / 2f;
this.yRadius = img.getHeight() / 2f;
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}
/**
* Creates a new button from a 3-part Image.
* @param imgCenter the center image
* @param imgLeft the left image
* @param imgRight the right image
* @param x the center x coordinate
* @param y the center y coordinate
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*/
public MenuButton(Image imgCenter, Image imgLeft, Image imgRight, float x, float y) {
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this.img = imgCenter;
this.imgL = imgLeft;
this.imgR = imgRight;
this.x = x;
this.y = y;
this.xRadius = (img.getWidth() + imgL.getWidth() + imgR.getWidth()) / 2f;
this.yRadius = img.getHeight() / 2f;
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}
/**
* Creates a new button from an Animation.
* @param anim the animation
* @param x the center x coordinate
* @param y the center y coordinate
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*/
public MenuButton(Animation anim, float x, float y) {
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this.anim = anim;
this.x = x;
this.y = y;
this.xRadius = anim.getWidth() / 2f;
this.yRadius = anim.getHeight() / 2f;
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}
/**
* Sets a new center x coordinate.
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*/
public void setX(float x) { this.x = x; }
/**
* Sets a new center y coordinate.
*/
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public void setY(float y) { this.y = y; }
/**
* Returns the center x coordinate.
*/
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public float getX() { return x; }
/**
* Returns the center y coordinate.
*/
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public float getY() { return y; }
/**
* Sets text to draw in the middle of the button.
* @param text the text to draw
* @param font the font to use when drawing
* @color the color to draw the text
*/
public void setText(String text, Font font, Color color) {
this.text = text;
this.font = font;
this.color = color;
}
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/**
* Returns the associated image.
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*/
public Image getImage() { return img; }
/**
* Returns the associated animation.
*/
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public Animation getAnimation() { return anim; }
/**
* Draws the button.
*/
public void draw() { draw(Color.white); }
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/**
* Draw the button with a color filter.
* @param filter the color to filter with when drawing
*/
@SuppressWarnings("deprecation")
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public void draw(Color filter) {
// animations: get current frame
Image image = this.img;
if (image == null) {
anim.updateNoDraw();
image = anim.getCurrentFrame();
}
// normal images
if (imgL == null) {
if (hoverEffect == 0)
image.draw(x - xRadius, y - yRadius, filter);
else {
float oldAlpha = image.getAlpha();
float oldAngle = image.getRotation();
if ((hoverEffect & EFFECT_EXPAND) > 0) {
if (scale != 1f) {
image = image.getScaledCopy(scale);
image.setAlpha(oldAlpha);
}
}
if ((hoverEffect & EFFECT_FADE) > 0)
image.setAlpha(alpha);
if ((hoverEffect & EFFECT_ROTATE) > 0)
image.setRotation(angle);
image.draw(x - xRadius, y - yRadius, filter);
if (image != this.img) {
image.setAlpha(oldAlpha);
image.setRotation(oldAngle);
}
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}
}
// 3-part images
else {
if (hoverEffect == 0) {
image.draw(x - xRadius + imgL.getWidth(), y - yRadius, filter);
imgL.draw(x - xRadius, y - yRadius, filter);
imgR.draw(x + xRadius - imgR.getWidth(), y - yRadius, filter);
} else if ((hoverEffect & EFFECT_FADE) > 0) {
float a = image.getAlpha(), aL = imgL.getAlpha(), aR = imgR.getAlpha();
image.setAlpha(alpha);
imgL.setAlpha(alpha);
imgR.setAlpha(alpha);
image.draw(x - xRadius + imgL.getWidth(), y - yRadius, filter);
imgL.draw(x - xRadius, y - yRadius, filter);
imgR.draw(x + xRadius - imgR.getWidth(), y - yRadius, filter);
image.setAlpha(a);
imgL.setAlpha(aL);
imgR.setAlpha(aR);
}
}
// text
if (text != null)
font.drawString(x - font.getWidth(text) / 2f, y - font.getLineHeight() / 2f, text, color);
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}
/**
* Returns true if the coordinates are within the button bounds.
* @param cx the x coordinate
* @param cy the y coordinate
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*/
public boolean contains(float cx, float cy) {
return ((cx > x - xRadius && cx < x + xRadius) &&
(cy > y - yRadius && cy < y + yRadius));
}
/**
* Returns true if the coordinates are within the button bounds and the
* pixel at the specified location has an alpha level above the given bound.
* @param cx the x coordinate
* @param cy the y coordinate
* @param alpha the alpha level lower bound
*/
public boolean contains(float cx, float cy, float alpha) {
Image image = this.img;
if (image == null)
image = anim.getCurrentFrame();
float xRad = img.getWidth() / 2f, yRad = img.getHeight() / 2f;
return ((cx > x - xRad && cx < x + xRad) &&
(cy > y - yRad && cy < y + yRad) &&
image.getAlphaAt((int) (cx - (x - xRad)), (int) (cy - (y - yRad))) > alpha);
}
/**
* Resets the hover fields for the button.
*/
public void resetHover() {
if ((hoverEffect & EFFECT_EXPAND) > 0) {
this.scale = 1f;
setHoverRadius();
}
if ((hoverEffect & EFFECT_FADE) > 0)
this.alpha = baseAlpha;
if ((hoverEffect & EFFECT_ROTATE) > 0)
this.angle = 0f;
}
/**
* Removes all hover effects that have been set for the button.
*/
public void removeHoverEffects() { hoverEffect = 0; }
/**
* Sets the "expand" hover effect.
*/
public void setHoverExpand() { hoverEffect |= EFFECT_EXPAND; }
/**
* Sets the "expand" hover effect.
* @param scale the maximum scale factor (default 1.25f)
*/
public void setHoverExpand(float scale) { setHoverExpand(scale, this.dir); }
/**
* Sets the "expand" hover effect.
* @param dir the expansion direction
*/
public void setHoverExpand(Expand dir) { setHoverExpand(this.hoverScale, dir); }
/**
* Sets the "expand" hover effect.
* @param scale the maximum scale factor (default 1.25f)
* @param dir the expansion direction
*/
public void setHoverExpand(float scale, Expand dir) {
hoverEffect |= EFFECT_EXPAND;
this.hoverScale = scale;
this.dir = dir;
}
/**
* Sets the "fade" hover effect.
*/
public void setHoverFade() { hoverEffect |= EFFECT_FADE; }
/**
* Sets the "fade" hover effect.
* @param baseAlpha the base alpha level to fade in from (default 0.7f)
*/
public void setHoverFade(float baseAlpha) {
hoverEffect |= EFFECT_FADE;
this.baseAlpha = baseAlpha;
}
/**
* Sets the "rotate" hover effect.
*/
public void setHoverRotate() { hoverEffect |= EFFECT_ROTATE; }
/**
* Sets the "rotate" hover effect.
* @param maxAngle the maximum rotation angle, in degrees (default 30f)
*/
public void setHoverRotate(float maxAngle) {
hoverEffect |= EFFECT_ROTATE;
this.maxAngle = maxAngle;
}
/**
* Processes a hover action depending on whether or not the cursor
* is hovering over the button.
* @param delta the delta interval
* @param cx the x coordinate
* @param cy the y coordinate
*/
public void hoverUpdate(int delta, float cx, float cy) {
hoverUpdate(delta, contains(cx, cy));
}
/**
* Processes a hover action depending on whether or not the cursor
* is hovering over the button, only if the specified pixel of the
* image has an alpha level above the given bound.
* @param delta the delta interval
* @param cx the x coordinate
* @param cy the y coordinate
* @param alpha the alpha level lower bound
*/
public void hoverUpdate(int delta, float cx, float cy, float alpha) {
hoverUpdate(delta, contains(cx, cy, alpha));
}
/**
* Processes a hover action depending on whether or not the cursor
* is hovering over the button.
* @param delta the delta interval
* @param isHover true if the cursor is currently hovering over the button
*/
public void hoverUpdate(int delta, boolean isHover) {
if (hoverEffect == 0)
return;
// scale the button
if ((hoverEffect & EFFECT_EXPAND) > 0) {
int sign = 0;
if (isHover && scale < hoverScale)
sign = 1;
else if (!isHover && scale > 1f)
sign = -1;
if (sign != 0) {
scale = Utils.getBoundedValue(scale, sign * (hoverScale - 1f) * delta / 100f, 1, hoverScale);
setHoverRadius();
}
}
// fade the button
if ((hoverEffect & EFFECT_FADE) > 0) {
int sign = 0;
if (isHover && alpha < 1f)
sign = 1;
else if (!isHover && alpha > baseAlpha)
sign = -1;
if (sign != 0)
alpha = Utils.getBoundedValue(alpha, sign * (1f - baseAlpha) * delta / 200f, baseAlpha, 1f);
}
// rotate the button
if ((hoverEffect & EFFECT_ROTATE) > 0) {
int sign = 0;
boolean right = (maxAngle > 0);
if (isHover && angle != maxAngle)
sign = (right) ? 1 : -1;
else if (!isHover && angle != 0)
sign = (right) ? -1 : 1;
if (sign != 0) {
float diff = sign * Math.abs(maxAngle) * delta / 125f;
angle = (right) ?
Utils.getBoundedValue(angle, diff, 0, maxAngle) :
Utils.getBoundedValue(angle, diff, maxAngle, 0);
}
}
}
/**
* Set x and y radius of the button based on current scale factor
* and expansion direction.
*/
private void setHoverRadius() {
Image image = this.img;
if (image == null)
image = anim.getCurrentFrame();
int xOffset = 0, yOffset = 0;
if (dir != Expand.CENTER) {
// offset by difference between normal/scaled image dimensions
xOffset = (int) ((scale - 1f) * image.getWidth());
yOffset = (int) ((scale - 1f) * image.getHeight());
if (dir == Expand.UP || dir == Expand.DOWN)
xOffset = 0; // no horizontal offset
if (dir == Expand.RIGHT || dir == Expand.LEFT)
yOffset = 0; // no vertical offset
if (dir == Expand.RIGHT || dir == Expand.DOWN_RIGHT || dir == Expand.UP_RIGHT)
xOffset *= -1; // flip x for right
if (dir == Expand.DOWN || dir == Expand.DOWN_LEFT || dir == Expand.DOWN_RIGHT)
yOffset *= -1; // flip y for down
}
this.xRadius = ((image.getWidth() * scale) + xOffset) / 2f;
this.yRadius = ((image.getHeight() * scale) + yOffset) / 2f;
}
}