forked from rhetr/seq-gui
/
envelope_editor.py
253 lines (226 loc) · 10.5 KB
/
envelope_editor.py
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"""
A piano roll viewer that will eventually become a piano roll editor
"""
import sys
from PyQt4 import QtGui, QtCore
global_points = []
global_axes_size = 28
#global_max_start_time = 999.0
global_viewer_width = 1000
global_viewer_height = 300
class envelope_item(QtGui.QGraphicsEllipseItem):
'''a single point on an envelope'''
def __init__(self, a_time, a_value):
f_size = 15
self.f_half_size = f_size / 2.0
QtGui.QGraphicsEllipseItem.__init__(self, 0, 0, f_size, f_size)
self.setFlag(QtGui.QGraphicsItem.ItemIsSelectable)
self.setFlag(QtGui.QGraphicsItem.ItemIsMovable)
self.setFlag(QtGui.QGraphicsItem.ItemSendsGeometryChanges)
self.setAcceptHoverEvents(True)
self.setPos(a_time - self.f_half_size, a_value - self.f_half_size)
self.setBrush(QtGui.QColor(255, 0, 0))
f_pen = QtGui.QPen()
f_pen.setWidth(2)
f_pen.setColor(QtGui.QColor(170, 0, 0))
self.setPen(f_pen)
self.o_brush = QtGui.QColor(255, 0, 0)
self.hover_brush = QtGui.QColor(255, 200, 200)
self.s_brush = QtGui.QColor(0, 255, 0)
self.pressed = False
def select(self):
self.setSelected(True)
self.setBrush(self.s_brush)
def deselect(self):
self.setSelected(False)
self.setBrush(self.o_brush)
def hoverEnterEvent(self, a_event):
QtGui.QGraphicsRectItem.hoverEnterEvent(self, a_event)
if not self.isSelected():
self.setBrush(self.hover_brush)
def hoverLeaveEvent(self, a_event):
QtGui.QGraphicsRectItem.hoverLeaveEvent(self, a_event)
if not self.isSelected():
self.setBrush(self.o_brush)
else:
self.setBrush(self.s_brush)
def mousePressEvent(self, a_event):
QtGui.QGraphicsEllipseItem.mousePressEvent(self, a_event)
self.setGraphicsEffect(QtGui.QGraphicsOpacityEffect())
self.select()
self.pressed = True
def mouseMoveEvent(self, a_event):
QtGui.QGraphicsEllipseItem.mouseMoveEvent(self, a_event)
f_pos_x = self.pos().x()
f_pos_y = self.pos().y()
if f_pos_x < global_axes_size-self.f_half_size:
f_pos_x = global_axes_size-self.f_half_size
elif f_pos_x > global_viewer_width+global_axes_size-self.f_half_size:
f_pos_x = global_viewer_width+global_axes_size-self.f_half_size
if f_pos_y < global_axes_size-self.f_half_size:
f_pos_y = global_axes_size-self.f_half_size
elif f_pos_y > global_viewer_height+global_axes_size-self.f_half_size:
f_pos_y = global_viewer_height+global_axes_size-self.f_half_size
self.setPos(f_pos_x, f_pos_y)
def mouseReleaseEvent(self, a_event):
a_event.setAccepted(True)
self.pressed = False
self.setPos(self.pos())
QtGui.QGraphicsEllipseItem.mouseReleaseEvent(self, a_event)
self.setGraphicsEffect(None)
class envelope_editor(QtGui.QGraphicsView):
'''the envelope editor'''
def __init__(self, a_item_length = 4, a_grid_div = 16):
self.item_length = float(a_item_length)
self.steps = 127.0
self.grid_div = a_grid_div
global_axes_size = 28
self.beat_width = global_viewer_width / self.item_length
self.value_width = self.beat_width / self.grid_div
self.lines = []
QtGui.QGraphicsView.__init__(self)
self.scene = QtGui.QGraphicsScene(self)
#self.scene.setBackgroundBrush(QtGui.QColor(100, 100, 100))
self.scene.setBackgroundBrush(QtGui.QColor(200,200,200))
self.scene.mousePressEvent = self.sceneMousePressEvent
self.scene.mouseMoveEvent = self.sceneMouseMoveEvent
self.scene.mouseReleaseEvent = self.sceneMouseReleaseEvent
self.setVerticalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.setHorizontalScrollBarPolicy(QtCore.Qt.ScrollBarAlwaysOff)
self.setAlignment(QtCore.Qt.AlignLeft)
self.setScene(self.scene)
self.draw_axes()
self.draw_grid()
self.draw_endpoints(0.0,64)
self.draw_endpoints(3.99,64)
self.insert_mode = False
self.selected_points = [] #could just iterate over global_points for isSelected() but what the hell
def keyPressEvent(self, a_event):
QtGui.QGraphicsView.keyPressEvent(self, a_event)
if a_event.key() == QtCore.Qt.Key_B:
if not self.insert_mode:
self.insert_mode = True
else:
self.insert_mode = False
if a_event.key() == QtCore.Qt.Key_Delete or a_event.key() == QtCore.Qt.Key_Backspace:
#for point in self.selected_points:
for point in global_points:
if point.isSelected():
point.deselect()
self.scene.removeItem(point)
global_points.remove(point)
self.connect_points()
def sceneMousePressEvent(self, a_event):
QtGui.QGraphicsScene.mousePressEvent(self.scene, a_event)
if not any(point.isSelected() for point in global_points):
if self.insert_mode:
f_pos_x = a_event.scenePos().x()
f_pos_y = a_event.scenePos().y()
f_time = (f_pos_x - global_axes_size) / self.beat_width
f_value = self.steps - (f_pos_y - global_axes_size) * self.steps / global_viewer_height
print f_time,",", f_value
self.draw_point(f_time, f_value)
else:
for point in global_points:
point.deselect()
def sceneMouseMoveEvent(self, a_event):
QtGui.QGraphicsScene.mouseMoveEvent(self.scene, a_event)
if any(point.isSelected() for point in global_points):
#if self.scene.mouseGrabberItem():
self.connect_points()
def sceneMouseReleaseEvent(self, a_event):
QtGui.QGraphicsScene.mouseReleaseEvent(self.scene, a_event)
def draw_axes(self):
self.x_axis = QtGui.QGraphicsRectItem(0, 0, global_viewer_width, global_axes_size)
self.x_axis.setPos(global_axes_size, 0)
self.scene.addItem(self.x_axis)
self.y_axis = QtGui.QGraphicsRectItem(0, 0, global_axes_size, global_viewer_height)
self.y_axis.setPos(0, global_axes_size)
self.scene.addItem(self.y_axis)
def draw_grid(self):
f_beat_pen = QtGui.QPen()
f_beat_pen.setWidth(2)
f_line_pen = QtGui.QPen()
f_line_pen.setColor(QtGui.QColor(0, 0, 0, 40))
f_labels = [0,'127',0,'64',0,'0']
for i in range(1, 6):
f_line = QtGui.QGraphicsLineItem(0, 0, global_viewer_width, 0, self.y_axis)
f_line.setPos(global_axes_size, global_viewer_height * (i - 1) / 4)
if i % 2:
f_label = QtGui.QGraphicsSimpleTextItem(f_labels[i], self.y_axis)
f_label.setPos(1, global_viewer_height * (i - 1) / 4)
f_label.setBrush(QtCore.Qt.white)
if i == 3:
f_line.setPen(f_beat_pen)
for i in range(0, int(self.item_length) + 1):
f_beat = QtGui.QGraphicsLineItem(0, 0, 0, global_viewer_height + global_axes_size - f_beat_pen.width(), self.x_axis)
f_beat.setPos(self.beat_width * i, 0.5 * f_beat_pen.width())
f_beat.setPen(f_beat_pen)
if i < self.item_length:
f_number = QtGui.QGraphicsSimpleTextItem(str(i), self.x_axis)
f_number.setPos(self.beat_width * i + 5, 2)
f_number.setBrush(QtCore.Qt.white)
for j in range(0, self.grid_div):
f_line = QtGui.QGraphicsLineItem(0, 0, 0, global_viewer_height, self.x_axis)
if float(j) == self.grid_div / 2.0:
f_line.setLine(0, 0, 0, global_viewer_height)
f_line.setPos(self.beat_width * i + self.value_width * j, global_axes_size)
else:
f_line.setPos(self.beat_width * i + self.value_width * j, global_axes_size)
f_line.setPen(f_line_pen)
def set_zoom(self, a_scale):
self.scale(a_scale, 1.0)
def clear_drawn_items(self):
self.scene.clear()
self.draw_axes()
self.draw_grid()
def connect_points(self):
if self.lines:
for i in range(len(self.lines)):
self.scene.removeItem(self.lines[i])
if len(global_points) > 1:
self.lines = (len(global_points) - 1) * [None]
global_points.sort(key=lambda point: point.pos().x())
f_line_pen = QtGui.QPen()
f_line_pen.setColor(QtGui.QColor(200, 50, 50))
f_line_pen.setWidth(4)
for i in range(1, len(global_points)):
#f_start_x = global_axes_size
#f_start_y = global_axes_size+(global_viewer_height/2.0)
#f_end_x = global_axes_size+global_viewer_width
#f_end_y = global_axes_size+(global_viewer_height/2.0)
f_start_x = global_points[(i - 1)].pos().x()
f_start_y = global_points[(i - 1)].pos().y()
f_end_x = global_points[i].pos().x()
f_end_y = global_points[i].pos().y()
f_pos_x = f_end_x - f_start_x
f_pos_y = f_end_y - f_start_y
f_line = QtGui.QGraphicsLineItem(0, 0, f_pos_x, f_pos_y)
f_line.setPos(7.5 + f_start_x, 7.5 + f_start_y)
f_line.setPen(f_line_pen)
self.scene.addItem(f_line)
self.lines[i - 1] = f_line
def draw_point(self, a_time, a_value):
f_time = global_axes_size + self.beat_width * a_time
f_value = global_axes_size + global_viewer_height / self.steps * (self.steps - a_value)
f_point = envelope_item(f_time, f_value)
global_points.append(f_point)
self.scene.addItem(f_point)
self.connect_points()
def draw_endpoints(self, a_time, a_value):
f_time = global_axes_size + self.beat_width * a_time
f_value = global_axes_size + global_viewer_height / self.steps * (self.steps - a_value)
f_point = envelope_item(f_time, f_value)
f_point.setFlag(QtGui.QGraphicsItem.ItemIsMovable, False)
global_points.append(f_point)
self.scene.addItem(f_point)
self.connect_points()
if __name__ == '__main__':
app = QtGui.QApplication(sys.argv)
view = envelope_editor()
view.draw_point(2, 127)
view.draw_point(3, 64)
view.draw_point(0, 0)
view.draw_point(1, 54)
view.show()
sys.exit(app.exec_())